Squashed 'libs/json/' content from commit f42a74b8

git-subtree-dir: libs/json
git-subtree-split: f42a74b8f53cc308647123d49d33d1c8122e3f42

.clang-format

@@ -0,0 +1,84 @@
+#AccessModifierOffset: 2
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: false
+#AlignConsecutiveBitFields: false
+AlignConsecutiveDeclarations: false
+AlignConsecutiveMacros: false
+AlignEscapedNewlines: Right
+#AlignOperands: AlignAfterOperator
+AlignTrailingComments: true
+AllowAllArgumentsOnNextLine: false
+AllowAllConstructorInitializersOnNextLine: false
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortBlocksOnASingleLine: Empty
+AllowShortCaseLabelsOnASingleLine: false
+#AllowShortEnumsOnASingleLine: true
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLambdasOnASingleLine: Empty
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: Yes
+BinPackArguments: false
+BinPackParameters: false
+#BitFieldColonSpacing: Both
+BreakBeforeBraces: Custom # or Allman
+BraceWrapping:
+  AfterCaseLabel: true
+  AfterClass: true
+  AfterControlStatement: Always
+  AfterEnum: true
+  AfterFunction: true
+  AfterNamespace: false
+  AfterStruct: true
+  AfterUnion: true
+  AfterExternBlock: false
+  BeforeCatch: true
+  BeforeElse: true
+  #BeforeLambdaBody: false
+  #BeforeWhile: false
+  SplitEmptyFunction: false
+  SplitEmptyRecord: false
+  SplitEmptyNamespace: false
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializers: BeforeComma
+BreakStringLiterals: false
+ColumnLimit: 0
+CompactNamespaces: false
+ConstructorInitializerIndentWidth: 2
+Cpp11BracedListStyle: true
+PointerAlignment: Left
+FixNamespaceComments: true
+IncludeBlocks: Preserve
+#IndentCaseBlocks: false
+IndentCaseLabels: true
+IndentGotoLabels: false
+IndentPPDirectives: BeforeHash
+IndentWidth: 4
+KeepEmptyLinesAtTheStartOfBlocks: false
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+ReflowComments: false
+SortIncludes: true
+SortUsingDeclarations: true
+SpaceAfterCStyleCast: false
+SpaceAfterLogicalNot: false
+SpaceAfterTemplateKeyword: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCpp11BracedList: false
+SpaceBeforeParens: ControlStatements
+SpaceBeforeRangeBasedForLoopColon: true
+SpaceBeforeSquareBrackets: false
+SpaceInEmptyBlock: false
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 2
+SpacesInAngles: false
+SpacesInCStyleCastParentheses: false
+SpacesInConditionalStatement: false
+SpacesInContainerLiterals: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+Standard: c++11
+TabWidth: 4
+UseTab: Never

.clang-tidy

@@ -0,0 +1,44 @@
+Checks: '*,
+         -android-cloexec-fopen,
+         -cppcoreguidelines-avoid-goto,
+         -cppcoreguidelines-avoid-magic-numbers,
+         -cppcoreguidelines-avoid-non-const-global-variables,
+         -cppcoreguidelines-macro-usage,
+         -cppcoreguidelines-pro-bounds-array-to-pointer-decay,
+         -cppcoreguidelines-pro-bounds-constant-array-index,
+         -cppcoreguidelines-pro-bounds-pointer-arithmetic,
+         -cppcoreguidelines-pro-type-reinterpret-cast,
+         -cppcoreguidelines-pro-type-union-access,
+         -fuchsia-default-arguments-calls,
+         -fuchsia-default-arguments-declarations,
+         -fuchsia-overloaded-operator,
+         -google-explicit-constructor,
+         -google-readability-function-size,
+         -google-runtime-int,
+         -google-runtime-references,
+         -hicpp-avoid-goto,
+         -hicpp-explicit-conversions,
+         -hicpp-function-size,
+         -hicpp-no-array-decay,
+         -hicpp-no-assembler,
+         -hicpp-signed-bitwise,
+         -hicpp-uppercase-literal-suffix,
+         -llvm-header-guard,
+         -llvm-include-order,
+         -llvmlibc-*,
+         -misc-no-recursion,
+         -misc-non-private-member-variables-in-classes,
+         -modernize-use-trailing-return-type,
+         -readability-function-size,
+         -readability-magic-numbers,
+         -readability-redundant-access-specifiers,
+         -readability-uppercase-literal-suffix'
+
+CheckOptions:
+  - key: hicpp-special-member-functions.AllowSoleDefaultDtor
+    value: 1
+
+WarningsAsErrors: '*'
+
+#HeaderFilterRegex: '.*nlohmann.*'
+HeaderFilterRegex: '.*hpp$'

.drone.yml

@@ -0,0 +1,22 @@
+kind: pipeline
+name: test-on-arm64
+
+platform:
+  arch: arm64
+
+steps:
+- name: build
+  image: gcc
+  commands:
+  - wget https://github.com/Kitware/CMake/releases/download/v3.20.2/cmake-3.20.2.tar.gz
+  - tar xfz cmake-3.20.2.tar.gz
+  - cd cmake-3.20.2
+  - ./configure
+  - make cmake ctest -j10
+  - cd ..
+  - mkdir build
+  - cd build
+  - ../cmake-3.20.2/bin/cmake .. -DJSON_FastTests=ON
+  - make -j10
+  - cd test
+  - ../../cmake-3.20.2/bin/ctest -j10

.github/CODEOWNERS

@@ -0,0 +1,6 @@
+# JSON for Modern C++ has been originally written by Niels Lohmann.
+# Since 2013 over 140 contributors have helped to improve the library.
+# This CODEOWNERS file is only to make sure that @nlohmann is requested
+# for a code review in case of a pull request.
+
+* @nlohmann

.github/CONTRIBUTING.md

@@ -0,0 +1,71 @@
+[![Issue Stats](http://issuestats.com/github/nlohmann/json/badge/pr?style=flat)](http://issuestats.com/github/nlohmann/json) [![Issue Stats](http://issuestats.com/github/nlohmann/json/badge/issue?style=flat)](http://issuestats.com/github/nlohmann/json)
+
+# How to contribute
+
+This project started as a little excuse to exercise some of the cool new C++11 features. Over time, people actually started to use the JSON library (yey!) and started to help improve it by proposing features, finding bugs, or even fixing my mistakes. I am really [thankful](https://github.com/nlohmann/json/blob/master/README.md#thanks) for this and try to keep track of all the helpers.
+
+To make it as easy as possible for you to contribute and for me to keep an overview, here are a few guidelines which should help us avoid all kinds of unnecessary work or disappointment. And of course, this document is subject to discussion, so please [create an issue](https://github.com/nlohmann/json/issues/new/choose) or a pull request if you find a way to improve it!
+
+## Private reports
+
+Usually, all issues are tracked publicly on [GitHub](https://github.com/nlohmann/json/issues). If you want to make a private report (e.g., for a vulnerability or to attach an example that is not meant to be published), please send an email to <mail@nlohmann.me>.
+
+## Prerequisites
+
+Please [create an issue](https://github.com/nlohmann/json/issues/new/choose), assuming one does not already exist, and describe your concern. Note you need a [GitHub account](https://github.com/signup/free) for this.
+
+## Describe your issue
+
+Clearly describe the issue:
+
+- If it is a bug, please describe how to **reproduce** it. If possible, attach a complete example which demonstrates the error. Please also state what you **expected** to happen instead of the error.
+- If you propose a change or addition, try to give an **example** how the improved code could look like or how to use it.
+- If you found a compilation error, please tell us which **compiler** (version and operating system) you used and paste the (relevant part of) the error messages to the ticket.
+
+Please stick to the provided issue templates ([bug report](https://github.com/nlohmann/json/blob/develop/.github/ISSUE_TEMPLATE/Bug_report.md), [feature request](https://github.com/nlohmann/json/blob/develop/.github/ISSUE_TEMPLATE/Feature_request.md), or [question](https://github.com/nlohmann/json/blob/develop/.github/ISSUE_TEMPLATE/question.md)) if possible.
+
+## Files to change
+
+:exclamation: Before you make any changes, note the single-header file [`single_include/nlohmann/json.hpp`](https://github.com/nlohmann/json/blob/develop/single_include/nlohmann/json.hpp) is **generated** from the source files in the [`include/nlohmann` directory](https://github.com/nlohmann/json/tree/develop/include/nlohmann). Please **do not** edit file `single_include/nlohmann/json.hpp` directly, but change the `include/nlohmann` sources and regenerate file `single_include/nlohmann/json.hpp` by executing `make amalgamate`.
+
+To make changes, you need to edit the following files:
+
+1. [`include/nlohmann/*`](https://github.com/nlohmann/json/tree/develop/include/nlohmann) - These files are the sources of the library. Before testing or creating a pull request, execute `make amalgamate` to regenerate `single_include/nlohmann/json.hpp`.
+
+2. [`test/src/unit-*.cpp`](https://github.com/nlohmann/json/tree/develop/test/src) - These files contain the [doctest](https://github.com/onqtam/doctest) unit tests which currently cover [100 %](https://coveralls.io/github/nlohmann/json) of the library's code.
+
+   If you add or change a feature, please also add a unit test to this file. The unit tests can be compiled and executed with
+
+   ```sh
+   $ mkdir build
+   $ cd build
+   $ cmake ..
+   $ cmake --build .
+   $ ctest
+   ```
+
+   The test cases are also executed with several different compilers on [Travis](https://travis-ci.org/nlohmann/json) once you open a pull request.
+
+
+## Note
+
+- If you open a pull request, the code will be automatically tested with [Valgrind](http://valgrind.org)'s Memcheck tool to detect memory leaks. Please be aware that the execution with Valgrind _may_ in rare cases yield different behavior than running the code directly. This can result in failing unit tests which run successfully without Valgrind.
+- There is a Makefile target `make pretty` which runs [Artistic Style](http://astyle.sourceforge.net) to fix indentation. If possible, run it before opening the pull request. Otherwise, we shall run it afterward.
+
+## Please don't
+
+- The C++11 support varies between different **compilers** and versions. Please note the [list of supported compilers](https://github.com/nlohmann/json/blob/master/README.md#supported-compilers). Some compilers like GCC 4.7 (and earlier), Clang 3.3 (and earlier), or Microsoft Visual Studio 13.0 and earlier are known not to work due to missing or incomplete C++11 support. Please refrain from proposing changes that work around these compiler's limitations with `#ifdef`s or other means.
+- Specifically, I am aware of compilation problems with **Microsoft Visual Studio** (there even is an [issue label](https://github.com/nlohmann/json/issues?utf8=✓&q=label%3A%22visual+studio%22+) for these kind of bugs). I understand that even in 2016, complete C++11 support isn't there yet. But please also understand that I do not want to drop features or uglify the code just to make Microsoft's sub-standard compiler happy. The past has shown that there are ways to express the functionality such that the code compiles with the most recent MSVC - unfortunately, this is not the main objective of the project.
+- Please refrain from proposing changes that would **break [JSON](https://json.org) conformance**. If you propose a conformant extension of JSON to be supported by the library, please motivate this extension.
+  - We shall not extend the library to **support comments**. There is quite some [controversy](https://www.reddit.com/r/programming/comments/4v6chu/why_json_doesnt_support_comments_douglas_crockford/) around this topic, and there were quite some [issues](https://github.com/nlohmann/json/issues/376) on this. We believe that JSON is fine without comments.
+  - We do not preserve the **insertion order of object elements**. The [JSON standard](https://tools.ietf.org/html/rfc8259.html) defines objects as "an unordered collection of zero or more name/value pairs". To this end, this library does not preserve insertion order of name/value pairs. (In fact, keys will be traversed in alphabetical order as `std::map` with `std::less` is used by default.) Note this behavior conforms to the standard, and we shall not change it to any other order. If you do want to preserve the insertion order, you can specialize the object type with containers like [`tsl::ordered_map`](https://github.com/Tessil/ordered-map) or [`nlohmann::fifo_map`](https://github.com/nlohmann/fifo_map).
+
+- Please do not open pull requests that address **multiple issues**.
+
+## Wanted
+
+The following areas really need contribution:
+
+- Extending the **continuous integration** toward more exotic compilers such as Android NDK, Intel's Compiler, or the bleeding-edge versions Clang.
+- Improving the efficiency of the **JSON parser**. The current parser is implemented as a naive recursive descent parser with hand coded string handling. More sophisticated approaches like LALR parsers would be really appreciated. That said, parser generators like Bison or ANTLR do not play nice with single-header files -- I really would like to keep the parser inside the `json.hpp` header, and I am not aware of approaches similar to [`re2c`](http://re2c.org) for parsing.
+- Extending and updating existing **benchmarks** to include (the most recent version of) this library. Though efficiency is not everything, speed and memory consumption are very important characteristics for C++ developers, so having proper comparisons would be interesting.

.github/FUNDING.yml

@@ -0,0 +1,2 @@
+github: nlohmann
+custom: http://paypal.me/nlohmann

.github/ISSUE_TEMPLATE/Bug_report.md

@@ -0,0 +1,57 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: 'kind: bug'
+assignees: ''
+
+---
+
+<!-- Provide a concise summary of the issue in the title above. -->
+
+#### What is the issue you have?
+
+<!-- Provide a detailed introduction to the issue itself, and why you consider it to be a bug. -->
+<!-- If possible, be specific and add stack traces, error messages, etc. Avoid vague terms like "crash" or "doesn't work". -->
+
+#### Please describe the steps to reproduce the issue.
+
+<!-- Provide a link to a live example, or an unambiguous set of steps to -->
+<!-- reproduce this bug. Include code to reproduce, if relevant -->
+
+1.
+2.
+3.
+
+#### Can you provide a small but working code example?
+
+<!-- Please understand that we cannot analyze and debug large code bases. -->
+
+#### What is the expected behavior?
+
+<!-- Tell us what should happen -->
+
+#### And what is the actual behavior instead?
+
+<!-- Tell us what happens instead. -->
+
+#### Which compiler and operating system are you using?
+
+<!-- Include as many relevant details about the environment you experienced the bug in. -->
+<!-- Make sure you use a supported compiler, see https://github.com/nlohmann/json#supported-compilers. -->
+
+- Compiler: ___
+- Operating system: ___
+
+#### Which version of the library did you use?
+
+<!-- Please add an `x` to the respective line. -->
+
+- [ ] latest release version 3.10.0
+- [ ] other release - please state the version: ___
+- [ ] the `develop` branch
+
+#### If you experience a compilation error: can you [compile and run the unit tests](https://github.com/nlohmann/json#execute-unit-tests)?
+
+- [ ] yes
+- [ ] no - please copy/paste the error message below

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Ask a question
+    url: https://github.com/nlohmann/json/discussions
+    about: Ask questions and discuss with other community members

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,19 @@
+[Describe your pull request here. Please read the text below the line, and make sure you follow the checklist.]
+
+* * *
+
+## Pull request checklist
+
+Read the [Contribution Guidelines](https://github.com/nlohmann/json/blob/develop/.github/CONTRIBUTING.md) for detailed information.
+
+- [ ]  Changes are described in the pull request, or an [existing issue is referenced](https://github.com/nlohmann/json/issues).
+- [ ]  The test suite [compiles and runs](https://github.com/nlohmann/json/blob/develop/README.md#execute-unit-tests) without error.
+- [ ]  [Code coverage](https://coveralls.io/github/nlohmann/json) is 100%. Test cases can be added by editing the [test suite](https://github.com/nlohmann/json/tree/develop/test/src).
+- [ ]  The source code is amalgamated; that is, after making changes to the sources in the `include/nlohmann` directory, run `make amalgamate` to create the single-header file `single_include/nlohmann/json.hpp`. The whole process is described [here](https://github.com/nlohmann/json/blob/develop/.github/CONTRIBUTING.md#files-to-change).
+
+## Please don't
+
+- The C++11 support varies between different **compilers** and versions. Please note the [list of supported compilers](https://github.com/nlohmann/json/blob/master/README.md#supported-compilers). Some compilers like GCC 4.7 (and earlier), Clang 3.3 (and earlier), or Microsoft Visual Studio 13.0 and earlier are known not to work due to missing or incomplete C++11 support. Please refrain from proposing changes that work around these compiler's limitations with `#ifdef`s or other means.
+- Specifically, I am aware of compilation problems with **Microsoft Visual Studio** (there even is an [issue label](https://github.com/nlohmann/json/issues?utf8=✓&q=label%3A%22visual+studio%22+) for these kind of bugs). I understand that even in 2016, complete C++11 support isn't there yet. But please also understand that I do not want to drop features or uglify the code just to make Microsoft's sub-standard compiler happy. The past has shown that there are ways to express the functionality such that the code compiles with the most recent MSVC - unfortunately, this is not the main objective of the project.
+- Please refrain from proposing changes that would **break [JSON](https://json.org) conformance**. If you propose a conformant extension of JSON to be supported by the library, please motivate this extension.
+- Please do not open pull requests that address **multiple issues**.

.github/SECURITY.md

@@ -0,0 +1,5 @@
+# Security Policy
+
+## Reporting a Vulnerability
+
+Usually, all issues are tracked publicly on [GitHub](https://github.com/nlohmann/json/issues). If you want to make a private report (e.g., for a vulnerability or to attach an example that is not meant to be published), please send an email to <mail@nlohmann.me>. You can use [this key](https://keybase.io/nlohmann/pgp_keys.asc?fingerprint=797167ae41c0a6d9232e48457f3cea63ae251b69) for encryption.

.github/config.yml

@@ -0,0 +1,19 @@
+# Configuration for sentiment-bot - https://github.com/behaviorbot/sentiment-bot
+
+# *Required* toxicity threshold between 0 and .99 with the higher numbers being the most toxic
+# Anything higher than this threshold will be marked as toxic and commented on
+sentimentBotToxicityThreshold: .7
+
+# *Required* Comment to reply with
+sentimentBotReplyComment: >
+  Please be sure to review the [code of conduct](https://github.com/nlohmann/json/blob/develop/CODE_OF_CONDUCT.md) and be respectful of other users. cc/ @nlohmann
+
+
+# Configuration for request-info - https://github.com/behaviorbot/request-info
+
+# *Required* Comment to reply with
+requestInfoReplyComment: >
+  We would appreciate it if you could provide us with more info about this issue or pull request! Please check the [issue template](https://github.com/nlohmann/json/blob/develop/.github/ISSUE_TEMPLATE.md) and the [pull request template](https://github.com/nlohmann/json/blob/develop/.github/PULL_REQUEST_TEMPLATE.md).
+
+# *OPTIONAL* Label to be added to Issues and Pull Requests with insufficient information given
+requestInfoLabelToAdd: "state: needs more info"

.github/stale.yml

@@ -0,0 +1,17 @@
+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 30
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 7
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - pinned
+  - security
+# Label to use when marking an issue as stale
+staleLabel: "state: stale"
+# Comment to post when marking an issue as stale. Set to `false` to disable
+markComment: >
+  This issue has been automatically marked as stale because it has not had
+  recent activity. It will be closed if no further activity occurs. Thank you
+  for your contributions.
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: false

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,55 @@
+name: "Code scanning - action"
+
+on:
+  push:
+    branches:
+      - develop
+      - master
+      - release/*
+  pull_request:
+  schedule:
+    - cron: '0 19 * * 1'
+
+jobs:
+  CodeQL-Build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+      with:
+        # We must fetch at least the immediate parents so that if this is
+        # a pull request then we can checkout the head.
+        fetch-depth: 2
+
+    # If this run was triggered by a pull request event, then checkout
+    # the head of the pull request instead of the merge commit.
+    - run: git checkout HEAD^2
+      if: ${{ github.event_name == 'pull_request' }}
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      # Override language selection by uncommenting this and choosing your languages
+      # with:
+      #   languages: go, javascript, csharp, python, cpp, java
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v1
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 https://git.io/JvXDl
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1

.github/workflows/macos.yml

@@ -0,0 +1,44 @@
+name: macOS
+
+on:
+  push:
+    branches:
+      - develop
+      - master
+      - release/*
+  pull_request:
+
+jobs:
+  xcode:
+    runs-on: macos-10.15
+    strategy:
+      matrix:
+        xcode: [12.4, 12.3, 12.2, 12.1.1, 12.1, 12, 11.7, 11.6, 11.5, 11.4.1, 11.3.1, 11.2.1, 10.3]
+    env:
+      DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: cmake
+        run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DJSON_FastTests=ON
+      - name: build
+        run: cmake --build build --parallel 10
+      - name: test
+        run: cd build ; ctest -j 10 --output-on-failure
+
+  xcode_standards:
+    runs-on: macos-10.15
+    strategy:
+      matrix:
+        standard: [11, 14, 17, 20]
+    env:
+      DEVELOPER_DIR: /Applications/Xcode_12.4.app/Contents/Developer
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: cmake
+        run: cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DCMAKE_CXX_STANDARD=${{ matrix.standard }} -DCMAKE_CXX_STANDARD_REQUIRED=ON
+      - name: build
+        run: cmake --build build --parallel 10
+      - name: test
+        run: cd build ; ctest -j 10 --output-on-failure

.github/workflows/ubuntu.yml

@@ -0,0 +1,114 @@
+name: Ubuntu
+
+on:
+  push:
+    branches:
+      - develop
+      - master
+      - release/*
+  pull_request:
+
+jobs:
+  ci_test_clang:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: install_ninja
+        run: |
+          sudo apt update
+          sudo apt install ninja-build
+        shell: bash
+      - name: install_clang
+        run: |
+          wget https://apt.llvm.org/llvm.sh
+          chmod +x llvm.sh
+          sudo ./llvm.sh 11
+          sudo apt-get install clang-tools-11
+        shell: bash
+      - name: cmake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: build
+        run: cmake --build build --target ci_test_clang
+
+  ci_test_gcc:
+    runs-on: ubuntu-latest
+    container: nlohmann/json-ci:latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: cmake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: build
+        run: cmake --build build --target ci_test_gcc
+
+  ci_static_analysis:
+    runs-on: ubuntu-latest
+    container: nlohmann/json-ci:latest
+    strategy:
+      matrix:
+        target: [ci_clang_tidy, ci_cppcheck, ci_test_valgrind, ci_test_clang_sanitizer, ci_test_amalgamation, ci_clang_analyze, ci_cpplint, ci_cmake_flags, ci_single_binaries, ci_reproducible_tests, ci_non_git_tests, ci_offline_testdata, ci_infer]
+    steps:
+      - uses: actions/checkout@v2
+      - name: cmake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: build
+        run: cmake --build build --target ${{ matrix.target }}
+
+  ci_cmake_options:
+    runs-on: ubuntu-latest
+    container: nlohmann/json-ci:latest
+    strategy:
+      matrix:
+        target: [ci_test_diagnostics, ci_test_noexceptions, ci_test_noimplicitconversions]
+    steps:
+      - uses: actions/checkout@v2
+      - name: cmake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: build
+        run: cmake --build build --target ${{ matrix.target }}
+
+  ci_test_coverage:
+    runs-on: ubuntu-latest
+    container: nlohmann/json-ci:latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: cmake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: build
+        run: cmake --build build --target ci_test_coverage
+      - name: archive coverage report
+        uses: actions/upload-artifact@v2
+        with:
+          name: code-coverage-report
+          path: /__w/json/json/build/html
+      - name: Coveralls
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          path-to-lcov: /__w/json/json/build/json.info.filtered.noexcept
+
+  ci_test_compilers:
+    runs-on: ubuntu-latest
+    container: nlohmann/json-ci:latest
+    strategy:
+      matrix:
+        compiler: [g++-4.8, g++-4.9, g++-5, g++-7, g++-8, g++-9, g++-10, clang++-3.5, clang++-3.6, clang++-3.7, clang++-3.8, clang++-3.9, clang++-4.0, clang++-5.0, clang++-6.0, clang++-7, clang++-8, clang++-9, clang++-10, clang++-11]
+    steps:
+      - uses: actions/checkout@v2
+      - name: cmake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: build
+        run: cmake --build build --target ci_test_compiler_${{ matrix.compiler }}
+
+  ci_test_standards:
+    runs-on: ubuntu-latest
+    container: nlohmann/json-ci:latest
+    strategy:
+      matrix:
+        standard: [11, 14, 17, 20]
+        compiler: [gcc, clang]
+    steps:
+      - uses: actions/checkout@v2
+      - name: cmake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: build
+        run: cmake --build build --target ci_test_${{ matrix.compiler }}_cxx${{ matrix.standard }}

.github/workflows/windows.yml

@@ -0,0 +1,128 @@
+name: Windows
+
+on:
+  push:
+    branches:
+      - develop
+      - master
+      - release/*
+  pull_request:
+
+jobs:
+  mingw:
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        architecture: [x64, x86]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up MinGW
+        uses: egor-tensin/setup-mingw@v2
+        with:
+          platform: ${{ matrix.architecture }}
+      - name: cmake
+        run: cmake -S . -B build -G "MinGW Makefiles" -DCMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On
+      - name: build
+        run: cmake --build build --parallel 10
+      - name: test
+        run: cd build ; ctest -j 10 -C Debug --output-on-failure
+
+  msvc2017:
+    runs-on: windows-2016
+    strategy:
+      matrix:
+        build_type: [Debug, Release]
+        architecture: [Win32, x64]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: cmake
+      run: cmake -S . -B build -G "Visual Studio 15 2017" -A ${{ matrix.architecture }} -DJSON_BuildTests=On -DCMAKE_EXE_LINKER_FLAGS="/STACK:4000000" -DCMAKE_CXX_FLAGS="/W4 /WX"
+      if: matrix.build_type == 'Release' && matrix.architecture == 'x64'
+    - name: cmake
+      run: cmake -S . -B build -G "Visual Studio 15 2017" -A ${{ matrix.architecture }} -DJSON_BuildTests=On -DCMAKE_CXX_FLAGS="/W4 /WX"
+      if: matrix.build_type == 'Release' && matrix.architecture != 'x64'
+    - name: cmake
+      run: cmake -S . -B build -G "Visual Studio 15 2017" -A ${{ matrix.architecture }} -DJSON_BuildTests=On -DJSON_FastTests=ON -DCMAKE_EXE_LINKER_FLAGS="/STACK:4000000" -DCMAKE_CXX_FLAGS="/W4 /WX"
+      if: matrix.build_type == 'Debug'
+    - name: build
+      run: cmake --build build --config ${{ matrix.build_type }} --parallel 10
+    - name: test
+      run: cd build ; ctest -j 10 -C ${{ matrix.build_type }} --output-on-failure
+
+  msvc2017_latest:
+    runs-on: windows-2016
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: cmake
+      run: cmake -S . -B build -G "Visual Studio 15 2017" -DJSON_BuildTests=On -DCMAKE_CXX_FLAGS="/permissive- /std:c++latest /utf-8 /W4 /WX"
+    - name: build
+      run: cmake --build build --config Release --parallel 10
+    - name: test
+      run: cd build ; ctest -j 10 -C Release --output-on-failure
+
+  msvc2019:
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        build_type: [Debug, Release]
+        architecture: [Win32, x64]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: cmake
+      run: cmake -S . -B build -G "Visual Studio 16 2019" -A ${{ matrix.architecture }} -DJSON_BuildTests=On -DCMAKE_CXX_FLAGS="/W4 /WX"
+      if: matrix.build_type == 'Release'
+    - name: cmake
+      run: cmake -S . -B build -G "Visual Studio 16 2019" -A ${{ matrix.architecture }} -DJSON_BuildTests=On -DJSON_FastTests=ON -DCMAKE_EXE_LINKER_FLAGS="/STACK:4000000" -DCMAKE_CXX_FLAGS="/W4 /WX"
+      if: matrix.build_type == 'Debug'
+    - name: build
+      run: cmake --build build --config ${{ matrix.build_type }} --parallel 10
+    - name: test
+      run: cd build ; ctest -j 10 -C ${{ matrix.build_type }} --output-on-failure
+
+  msvc2019_latest:
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: cmake
+      run: cmake -S . -B build -G "Visual Studio 16 2019" -DJSON_BuildTests=On -DCMAKE_CXX_FLAGS="/permissive- /std:c++latest /utf-8 /W4 /WX" -DCMAKE_EXE_LINKER_FLAGS="/STACK:4000000"
+    - name: build
+      run: cmake --build build --config Release --parallel 10
+    - name: test
+      run: cd build ; ctest -j 10 -C Release --output-on-failure
+
+  clang:
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        version: [11, 12]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: install Clang
+        run: curl -fsSL -o LLVM${{ matrix.version }}.exe https://github.com/llvm/llvm-project/releases/download/llvmorg-${{ matrix.version }}.0.0/LLVM-${{ matrix.version }}.0.0-win64.exe ; 7z x LLVM${{ matrix.version }}.exe -y -o"C:/Program Files/LLVM"
+      - name: cmake
+        run: cmake -S . -B build -DCMAKE_CXX_COMPILER="C:/Program Files/LLVM/bin/clang++.exe" -G"MinGW Makefiles" -DCMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On
+      - name: build
+        run: cmake --build build --parallel 10
+      - name: test
+        run: cd build ; ctest -j 10 -C Debug --exclude-regex "test-unicode" --output-on-failure
+
+  clang-cl-11:
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        architecture: [Win32, x64]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: cmake
+        run: cmake -S . -B build -G "Visual Studio 16 2019" -A ${{ matrix.architecture }} -T ClangCL -DJSON_BuildTests=On
+      - name: build
+        run: cmake --build build --config Debug --parallel 10
+      - name: test
+        run: cd build ; ctest -j 10 -C Debug --exclude-regex "test-unicode" --output-on-failure

.gitignore

@@ -0,0 +1,36 @@
+json_unit
+json_benchmarks
+json_benchmarks_simple
+fuzz-testing
+
+*.dSYM
+*.o
+*.gcno
+*.gcda
+
+build
+build_coverage
+clang_analyze_build
+
+doc/xml
+doc/html
+me.nlohmann.json.docset
+
+benchmarks/files/numbers/*.json
+
+.wsjcpp-logs/*
+.wsjcpp/*
+
+.idea
+/cmake-build-*
+
+test/test-*
+/.vs
+
+doc/mkdocs/venv/
+doc/mkdocs/docs/images
+doc/mkdocs/docs/examples
+doc/mkdocs/site
+doc/mkdocs/docs/__pycache__/
+doc/xml
+/doc/docset/nlohmann_json.docset/

.travis.yml

@@ -0,0 +1,94 @@
+#########################
+# project configuration #
+#########################
+
+# C++ project
+language: cpp
+
+dist: trusty
+sudo: required
+group: edge
+
+
+################
+# build matrix #
+################
+
+matrix:
+  include:
+
+  # Coverity (only for branch coverity_scan)
+
+  - os: linux
+    compiler: clang
+    before_install: echo -n | openssl s_client -connect scan.coverity.com:443 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' | sudo tee -a /etc/ssl/certs/ca-certificates.crt
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.6']
+        packages: ['g++-6', 'clang-3.6', 'ninja-build']
+      coverity_scan:
+        project:
+          name: "nlohmann/json"
+          description: "Build submitted via Travis CI"
+        notification_email: niels.lohmann@gmail.com
+        build_command_prepend: "mkdir coverity_build ; cd coverity_build ; cmake .. ; cd .."
+        build_command: "make -C coverity_build"
+        branch_pattern: coverity_scan
+    env:
+      - SPECIAL=coverity
+      - COMPILER=clang++-3.6
+        # The next declaration is the encrypted COVERITY_SCAN_TOKEN, created
+        #   via the "travis encrypt" command using the project repo's public key
+      - secure: "m89SSgE+ASLO38rSKx7MTXK3n5NkP9bIx95jwY71YEiuFzib30PDJ/DifKnXxBjvy/AkCGztErQRk/8ZCvq+4HXozU2knEGnL/RUitvlwbhzfh2D4lmS3BvWBGS3N3NewoPBrRmdcvnT0xjOGXxtZaJ3P74TkB9GBnlz/HmKORA="
+
+  # OSX / Clang
+
+  - os: osx
+    osx_image: xcode10.2
+
+  # Linux / GCC
+
+  - os: linux
+    compiler: gcc
+    env: COMPILER=g++-6
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test']
+        packages: ['g++-6', 'ninja-build']
+
+################
+# build script #
+################
+
+script:
+  # get CMake and Ninja (only for systems with brew - macOS)
+  - |
+     if [[ (-x $(which brew)) ]]; then
+       brew update
+       brew install cmake ninja
+       brew upgrade cmake
+       cmake --version
+     fi
+
+  # make sure CXX is correctly set
+  - if [[ "${COMPILER}" != "" ]]; then export CXX=${COMPILER}; fi
+
+  # append CXX_STANDARD to CMAKE_OPTIONS if required
+  - CMAKE_OPTIONS+=${CXX_STANDARD:+ -DCMAKE_CXX_STANDARD=$CXX_STANDARD -DCMAKE_CXX_STANDARD_REQUIRED=ON}
+
+  # build configuration
+  - CMAKE_OPTIONS+=" -DCMAKE_BUILD_TYPE=Release"
+
+  # compile and execute unit tests
+  - mkdir -p build && cd build
+  - cmake .. ${CMAKE_OPTIONS} -DJSON_BuildTests=On -GNinja && cmake --build .
+  - ctest --timeout 2700 -V -j
+  - cd ..
+
+  # check if homebrew works (only checks develop branch)   
+  - if [ `which brew` ]; then   
+    brew update ;   
+    brew tap nlohmann/json ;    
+    brew install nlohmann_json --HEAD ;    
+    brew test nlohmann_json ;    
+    fi

CITATION.cff

@@ -0,0 +1,14 @@
+cff-version: 1.1.0
+message: "If you use this software, please cite it as below."
+authors: 
+  - family-names: Lohmann
+    given-names: Niels
+    orcid: https://orcid.org/0000-0001-9037-795X
+    email: mail@nlohmann.me
+    website: https://nlohmann.me
+title: "JSON for Modern C++"
+version: 3.10.0
+date-released: 2021
+license: MIT
+repository-code: "https://github.com/nlohmann"
+url: https://json.nlohmann.me

CMakeLists.txt

@@ -0,0 +1,188 @@
+cmake_minimum_required(VERSION 3.1)
+
+##
+## PROJECT
+## name and version
+##
+project(nlohmann_json VERSION 3.10.0 LANGUAGES CXX)
+
+##
+## MAIN_PROJECT CHECK
+## determine if nlohmann_json is built as a subproject (using add_subdirectory) or if it is the main project
+##
+set(MAIN_PROJECT OFF)
+if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
+    set(MAIN_PROJECT ON)
+endif()
+
+##
+## INCLUDE
+##
+##
+include(ExternalProject)
+
+##
+## OPTIONS
+##
+
+if (POLICY CMP0077)
+    # Allow CMake 3.13+ to override options when using FetchContent / add_subdirectory.
+    cmake_policy(SET CMP0077 NEW)
+endif ()
+
+option(JSON_BuildTests          "Build the unit tests when BUILD_TESTING is enabled." ${MAIN_PROJECT})
+option(JSON_CI                  "Enable CI build targets." OFF)
+option(JSON_Diagnostics         "Use extended diagnostic messages." OFF)
+option(JSON_ImplicitConversions "Enable implicit conversions." ON)
+option(JSON_Install             "Install CMake targets during install step." ${MAIN_PROJECT})
+option(JSON_MultipleHeaders     "Use non-amalgamated version of the library." OFF)
+option(JSON_SystemInclude       "Include as system headers (skip for clang-tidy)." OFF)
+
+if (JSON_CI)
+    include(cmake/ci.cmake)
+endif ()
+
+##
+## CONFIGURATION
+##
+include(GNUInstallDirs)
+
+set(NLOHMANN_JSON_TARGET_NAME               ${PROJECT_NAME})
+set(NLOHMANN_JSON_CONFIG_INSTALL_DIR        "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}" CACHE INTERNAL "")
+set(NLOHMANN_JSON_INCLUDE_INSTALL_DIR       "${CMAKE_INSTALL_INCLUDEDIR}")
+set(NLOHMANN_JSON_TARGETS_EXPORT_NAME       "${PROJECT_NAME}Targets")
+set(NLOHMANN_JSON_CMAKE_CONFIG_TEMPLATE     "cmake/config.cmake.in")
+set(NLOHMANN_JSON_CMAKE_CONFIG_DIR          "${CMAKE_CURRENT_BINARY_DIR}")
+set(NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}ConfigVersion.cmake")
+set(NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}Config.cmake")
+set(NLOHMANN_JSON_CMAKE_PROJECT_TARGETS_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}Targets.cmake")
+set(NLOHMANN_JSON_PKGCONFIG_INSTALL_DIR     "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
+
+if (JSON_MultipleHeaders)
+    set(NLOHMANN_JSON_INCLUDE_BUILD_DIR "${PROJECT_SOURCE_DIR}/include/")
+    message(STATUS "Using the multi-header code from ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}")
+else()
+    set(NLOHMANN_JSON_INCLUDE_BUILD_DIR "${PROJECT_SOURCE_DIR}/single_include/")
+    message(STATUS "Using the single-header code from ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}")
+endif()
+
+if (NOT JSON_ImplicitConversions)
+    message(STATUS "Implicit conversions are disabled")
+endif()
+
+if (JSON_Diagnostics)
+    message(STATUS "Diagnostics enabled")
+endif()
+
+if (JSON_SystemInclude)
+    set(NLOHMANN_JSON_SYSTEM_INCLUDE "SYSTEM")
+endif()
+
+##
+## TARGET
+## create target and add include path
+##
+add_library(${NLOHMANN_JSON_TARGET_NAME} INTERFACE)
+add_library(${PROJECT_NAME}::${NLOHMANN_JSON_TARGET_NAME} ALIAS ${NLOHMANN_JSON_TARGET_NAME})
+if (${CMAKE_VERSION} VERSION_LESS "3.8.0")
+    target_compile_features(${NLOHMANN_JSON_TARGET_NAME} INTERFACE cxx_range_for)
+else()
+    target_compile_features(${NLOHMANN_JSON_TARGET_NAME} INTERFACE cxx_std_11)
+endif()
+
+target_compile_definitions(
+    ${NLOHMANN_JSON_TARGET_NAME}
+    INTERFACE
+    JSON_USE_IMPLICIT_CONVERSIONS=$<BOOL:${JSON_ImplicitConversions}>
+    JSON_DIAGNOSTICS=$<BOOL:${JSON_Diagnostics}>
+)
+
+target_include_directories(
+    ${NLOHMANN_JSON_TARGET_NAME}
+    ${NLOHMANN_JSON_SYSTEM_INCLUDE} INTERFACE
+    $<BUILD_INTERFACE:${NLOHMANN_JSON_INCLUDE_BUILD_DIR}>
+    $<INSTALL_INTERFACE:include>
+)
+
+## add debug view definition file for msvc (natvis)
+if (MSVC)
+    set(NLOHMANN_ADD_NATVIS TRUE)
+    set(NLOHMANN_NATVIS_FILE "nlohmann_json.natvis")
+    target_sources(
+        ${NLOHMANN_JSON_TARGET_NAME}
+        INTERFACE
+            $<INSTALL_INTERFACE:${NLOHMANN_NATVIS_FILE}>
+            $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/${NLOHMANN_NATVIS_FILE}>
+    )
+endif()
+
+# Install a pkg-config file, so other tools can find this.
+CONFIGURE_FILE(
+    "${CMAKE_CURRENT_SOURCE_DIR}/cmake/pkg-config.pc.in"
+    "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.pc"
+)
+
+##
+## TESTS
+## create and configure the unit test target
+##
+if (JSON_BuildTests)
+    include(CTest)
+    enable_testing()
+    add_subdirectory(test)
+endif()
+
+##
+## INSTALL
+## install header files, generate and install cmake config files for find_package()
+##
+include(CMakePackageConfigHelpers)
+# use a custom package version config file instead of
+# write_basic_package_version_file to ensure that it's architecture-independent
+# https://github.com/nlohmann/json/issues/1697
+configure_file(
+    "cmake/nlohmann_jsonConfigVersion.cmake.in"
+    ${NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE}
+    @ONLY
+)
+configure_file(
+    ${NLOHMANN_JSON_CMAKE_CONFIG_TEMPLATE}
+    ${NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE}
+    @ONLY
+)
+
+if(JSON_Install)
+    install(
+        DIRECTORY ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}
+        DESTINATION ${NLOHMANN_JSON_INCLUDE_INSTALL_DIR}
+    )
+    install(
+        FILES ${NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE} ${NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE}
+        DESTINATION ${NLOHMANN_JSON_CONFIG_INSTALL_DIR}
+    )
+    if (NLOHMANN_ADD_NATVIS)
+        install(
+            FILES ${NLOHMANN_NATVIS_FILE}
+            DESTINATION .
+    )
+    endif()
+    export(
+        TARGETS ${NLOHMANN_JSON_TARGET_NAME}
+        NAMESPACE ${PROJECT_NAME}::
+        FILE ${NLOHMANN_JSON_CMAKE_PROJECT_TARGETS_FILE}
+    )
+    install(
+        TARGETS ${NLOHMANN_JSON_TARGET_NAME}
+        EXPORT ${NLOHMANN_JSON_TARGETS_EXPORT_NAME}
+        INCLUDES DESTINATION ${NLOHMANN_JSON_INCLUDE_INSTALL_DIR}
+    )
+    install(
+        EXPORT ${NLOHMANN_JSON_TARGETS_EXPORT_NAME}
+        NAMESPACE ${PROJECT_NAME}::
+        DESTINATION ${NLOHMANN_JSON_CONFIG_INSTALL_DIR}
+    )
+    install(
+        FILES "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.pc"
+        DESTINATION ${NLOHMANN_JSON_PKGCONFIG_INSTALL_DIR}
+    )
+endif()

CODE_OF_CONDUCT.md

@@ -0,0 +1,46 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as contributors and maintainers pledge to making participation in our project and our community a harassment-free experience for everyone, regardless of age, body size, disability, ethnicity, gender identity and expression, level of experience, nationality, personal appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable behavior and are expected to take appropriate and fair corrective action in response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct, or to ban temporarily or permanently any contributor for other behaviors that they deem inappropriate, threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces when an individual is representing the project or its community. Examples of representing a project or community include using an official project e-mail address, posting via an official social media account, or acting as an appointed representative at an online or offline event. Representation of a project may be further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting the project team at mail@nlohmann.me. The project team will review and investigate all complaints, and will respond in a way that it deems appropriate to the circumstances. The project team is obligated to maintain confidentiality with regard to the reporter of an incident. Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good faith may face temporary or permanent repercussions as determined by other members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4, available at [http://contributor-covenant.org/version/1/4][version]
+
+[homepage]: http://contributor-covenant.org
+[version]: http://contributor-covenant.org/version/1/4/

LICENSE.MIT

@@ -0,0 +1,21 @@
+MIT License 
+
+Copyright (c) 2013-2021 Niels Lohmann
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Makefile

@@ -0,0 +1,245 @@
+.PHONY: pretty clean ChangeLog.md release
+
+##########################################################################
+# configuration
+##########################################################################
+
+# directory to recent compiler binaries
+COMPILER_DIR=/usr/local/opt/llvm/bin
+
+# find GNU sed to use `-i` parameter
+SED:=$(shell command -v gsed || which sed)
+
+
+##########################################################################
+# source files
+##########################################################################
+
+# the list of sources in the include folder
+SRCS=$(shell find include -type f | sort)
+
+# the single header (amalgamated from the source files)
+AMALGAMATED_FILE=single_include/nlohmann/json.hpp
+
+
+##########################################################################
+# documentation of the Makefile's targets
+##########################################################################
+
+# main target
+all:
+	@echo "amalgamate - amalgamate file single_include/nlohmann/json.hpp from the include/nlohmann sources"
+	@echo "ChangeLog.md - generate ChangeLog file"
+	@echo "check-amalgamation - check whether sources have been amalgamated"
+	@echo "clean - remove built files"
+	@echo "doctest - compile example files and check their output"
+	@echo "fuzz_testing - prepare fuzz testing of the JSON parser"
+	@echo "fuzz_testing_bson - prepare fuzz testing of the BSON parser"
+	@echo "fuzz_testing_cbor - prepare fuzz testing of the CBOR parser"
+	@echo "fuzz_testing_msgpack - prepare fuzz testing of the MessagePack parser"
+	@echo "fuzz_testing_ubjson - prepare fuzz testing of the UBJSON parser"
+	@echo "pretty - beautify code with Artistic Style"
+	@echo "run_benchmarks - build and run benchmarks"
+
+
+##########################################################################
+# documentation tests
+##########################################################################
+
+# compile example files and check output
+doctest:
+	$(MAKE) check_output -C doc
+
+
+##########################################################################
+# benchmarks
+##########################################################################
+
+run_benchmarks:
+	rm -fr cmake-build-benchmarks
+	mkdir cmake-build-benchmarks
+	cd cmake-build-benchmarks ; cmake ../benchmarks -GNinja -DCMAKE_BUILD_TYPE=Release -DJSON_BuildTests=On
+	cd cmake-build-benchmarks ; ninja
+	cd cmake-build-benchmarks ; ./json_benchmarks
+
+##########################################################################
+# fuzzing
+##########################################################################
+
+# the overall fuzz testing target
+fuzz_testing:
+	rm -fr fuzz-testing
+	mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out
+	$(MAKE) parse_afl_fuzzer -C test CXX=afl-clang++
+	mv test/parse_afl_fuzzer fuzz-testing/fuzzer
+	find test/data/json_tests -size -5k -name *json | xargs -I{} cp "{}" fuzz-testing/testcases
+	@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"
+
+fuzz_testing_bson:
+	rm -fr fuzz-testing
+	mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out
+	$(MAKE) parse_bson_fuzzer -C test CXX=afl-clang++
+	mv test/parse_bson_fuzzer fuzz-testing/fuzzer
+	find test/data -size -5k -name *.bson | xargs -I{} cp "{}" fuzz-testing/testcases
+	@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"
+
+fuzz_testing_cbor:
+	rm -fr fuzz-testing
+	mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out
+	$(MAKE) parse_cbor_fuzzer -C test CXX=afl-clang++
+	mv test/parse_cbor_fuzzer fuzz-testing/fuzzer
+	find test/data -size -5k -name *.cbor | xargs -I{} cp "{}" fuzz-testing/testcases
+	@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"
+
+fuzz_testing_msgpack:
+	rm -fr fuzz-testing
+	mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out
+	$(MAKE) parse_msgpack_fuzzer -C test CXX=afl-clang++
+	mv test/parse_msgpack_fuzzer fuzz-testing/fuzzer
+	find test/data -size -5k -name *.msgpack | xargs -I{} cp "{}" fuzz-testing/testcases
+	@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"
+
+fuzz_testing_ubjson:
+	rm -fr fuzz-testing
+	mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out
+	$(MAKE) parse_ubjson_fuzzer -C test CXX=afl-clang++
+	mv test/parse_ubjson_fuzzer fuzz-testing/fuzzer
+	find test/data -size -5k -name *.ubjson | xargs -I{} cp "{}" fuzz-testing/testcases
+	@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"
+
+fuzzing-start:
+	afl-fuzz -S fuzzer1 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -S fuzzer2 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -S fuzzer3 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -S fuzzer4 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -S fuzzer5 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -S fuzzer6 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -S fuzzer7 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -M fuzzer0 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer
+
+fuzzing-stop:
+	-killall fuzzer
+	-killall afl-fuzz
+
+
+##########################################################################
+# Static analysis
+##########################################################################
+
+# call PVS-Studio Analyzer <https://www.viva64.com/en/pvs-studio/>
+pvs_studio:
+	rm -fr cmake-build-pvs-studio
+	mkdir cmake-build-pvs-studio
+	cd cmake-build-pvs-studio ; cmake .. -DCMAKE_EXPORT_COMPILE_COMMANDS=On -DJSON_MultipleHeaders=ON
+	cd cmake-build-pvs-studio ; pvs-studio-analyzer analyze -j 10
+	cd cmake-build-pvs-studio ; plog-converter -a'GA:1,2;64:1;CS' -t fullhtml PVS-Studio.log -o pvs
+	open cmake-build-pvs-studio/pvs/index.html
+
+##########################################################################
+# Code format and source amalgamation
+##########################################################################
+
+# call the Artistic Style pretty printer on all source files
+pretty:
+	astyle \
+		--style=allman \
+		--indent=spaces=4 \
+		--indent-modifiers \
+	    --indent-switches \
+	    --indent-preproc-block \
+	    --indent-preproc-define \
+	    --indent-col1-comments \
+	    --pad-oper \
+	    --pad-header \
+	    --align-pointer=type \
+	    --align-reference=type \
+	    --add-brackets \
+	    --convert-tabs \
+	    --close-templates \
+	    --lineend=linux \
+	    --preserve-date \
+	    --suffix=none \
+	    --formatted \
+	   $(SRCS) $(AMALGAMATED_FILE) test/src/*.cpp test/src/*.hpp benchmarks/src/benchmarks.cpp doc/examples/*.cpp
+
+# call the Clang-Format on all source files
+pretty_format:
+	for FILE in $(SRCS) $(AMALGAMATED_FILE) test/src/*.cpp test/src/*.hpp benchmarks/src/benchmarks.cpp doc/examples/*.cpp; do echo $$FILE; clang-format -i $$FILE; done
+
+# create single header file
+amalgamate: $(AMALGAMATED_FILE)
+
+# call the amalgamation tool and pretty print
+$(AMALGAMATED_FILE): $(SRCS)
+	third_party/amalgamate/amalgamate.py -c third_party/amalgamate/config.json -s . --verbose=yes
+	$(MAKE) pretty
+
+# check if file single_include/nlohmann/json.hpp has been amalgamated from the nlohmann sources
+# Note: this target is called by Travis
+check-amalgamation:
+	@mv $(AMALGAMATED_FILE) $(AMALGAMATED_FILE)~
+	@$(MAKE) amalgamate
+	@diff $(AMALGAMATED_FILE) $(AMALGAMATED_FILE)~ || (echo "===================================================================\n  Amalgamation required! Please read the contribution guidelines\n  in file .github/CONTRIBUTING.md.\n===================================================================" ; mv $(AMALGAMATED_FILE)~ $(AMALGAMATED_FILE) ; false)
+	@mv $(AMALGAMATED_FILE)~ $(AMALGAMATED_FILE)
+
+
+##########################################################################
+# ChangeLog
+##########################################################################
+
+# Create a ChangeLog based on the git log using the GitHub Changelog Generator
+# (<https://github.com/github-changelog-generator/github-changelog-generator>).
+
+# variable to control the diffs between the last released version and the current repository state
+NEXT_VERSION ?= "unreleased"
+
+ChangeLog.md:
+	github_changelog_generator -o ChangeLog.md --user nlohmann --project json --simple-list --release-url https://github.com/nlohmann/json/releases/tag/%s --future-release $(NEXT_VERSION)
+	$(SED) -i 's|https://github.com/nlohmann/json/releases/tag/HEAD|https://github.com/nlohmann/json/tree/HEAD|' ChangeLog.md
+	$(SED) -i '2i All notable changes to this project will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org/).' ChangeLog.md
+
+
+##########################################################################
+# Release files
+##########################################################################
+
+# Create the files for a release and add signatures and hashes. We use `-X` to make the resulting ZIP file
+# reproducible, see <https://content.pivotal.io/blog/barriers-to-deterministic-reproducible-zip-files>.
+
+release:
+	rm -fr release_files
+	mkdir release_files
+	zip -9 --recurse-paths -X include.zip $(SRCS) $(AMALGAMATED_FILE) meson.build LICENSE.MIT
+	gpg --armor --detach-sig include.zip
+	mv include.zip include.zip.asc release_files
+	gpg --armor --detach-sig $(AMALGAMATED_FILE)
+	cp $(AMALGAMATED_FILE) release_files
+	mv $(AMALGAMATED_FILE).asc release_files
+	cd release_files ; shasum -a 256 json.hpp > hashes.txt
+	cd release_files ; shasum -a 256 include.zip >> hashes.txt
+
+
+##########################################################################
+# Maintenance
+##########################################################################
+
+# clean up
+clean:
+	rm -fr json_unit json_benchmarks fuzz fuzz-testing *.dSYM test/*.dSYM oclint_report.html
+	rm -fr benchmarks/files/numbers/*.json
+	rm -fr cmake-3.1.0-Darwin64.tar.gz cmake-3.1.0-Darwin64
+	rm -fr cmake-build-benchmarks cmake-build-pedantic fuzz-testing cmake-build-clang-analyze cmake-build-pvs-studio cmake-build-infer cmake_build
+	$(MAKE) clean -Cdoc
+
+##########################################################################
+# Thirdparty code
+##########################################################################
+
+update_hedley:
+	rm -f include/nlohmann/thirdparty/hedley/hedley.hpp include/nlohmann/thirdparty/hedley/hedley_undef.hpp
+	curl https://raw.githubusercontent.com/nemequ/hedley/master/hedley.h -o include/nlohmann/thirdparty/hedley/hedley.hpp
+	$(SED) -i 's/HEDLEY_/JSON_HEDLEY_/g' include/nlohmann/thirdparty/hedley/hedley.hpp
+	grep "[[:blank:]]*#[[:blank:]]*undef" include/nlohmann/thirdparty/hedley/hedley.hpp | grep -v "__" | sort | uniq | $(SED) 's/ //g' | $(SED) 's/undef/undef /g' > include/nlohmann/thirdparty/hedley/hedley_undef.hpp
+	$(SED) -i '1s/^/#pragma once\n\n/' include/nlohmann/thirdparty/hedley/hedley.hpp
+	$(SED) -i '1s/^/#pragma once\n\n/' include/nlohmann/thirdparty/hedley/hedley_undef.hpp
+	$(MAKE) amalgamate

appveyor.yml

@@ -0,0 +1,84 @@
+version: '{build}'
+
+environment:
+  matrix:
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      configuration: Debug
+      platform: x86
+      CXX_FLAGS: "/W4 /WX"
+      LINKER_FLAGS: ""
+      CMAKE_OPTIONS: ""
+      GENERATOR: Visual Studio 14 2015
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      configuration: Release
+      platform: x86
+      CXX_FLAGS: "/W4 /WX"
+      LINKER_FLAGS: ""
+      CMAKE_OPTIONS: ""
+      GENERATOR: Visual Studio 14 2015
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      configuration: Release
+      platform: x86
+      name: with_win_header
+      CXX_FLAGS: "/W4 /WX"
+      LINKER_FLAGS: ""
+      CMAKE_OPTIONS: ""
+      GENERATOR: Visual Studio 14 2015
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      configuration: Release
+      platform: x86
+      CXX_FLAGS: "/permissive- /std:c++latest /utf-8 /W4 /WX"
+      LINKER_FLAGS: ""
+      CMAKE_OPTIONS: ""
+      GENERATOR: Visual Studio 15 2017
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+      configuration: Release
+      platform: x86
+      CXX_FLAGS: "/W4 /WX"
+      LINKER_FLAGS: ""
+      CMAKE_OPTIONS: "-DJSON_ImplicitConversions=OFF"
+      GENERATOR: Visual Studio 16 2019
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      configuration: Release
+      platform: x64
+      CXX_FLAGS: "/W4 /WX"
+      LINKER_FLAGS: ""
+      CMAKE_OPTIONS: ""
+      GENERATOR: Visual Studio 14 2015
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      configuration: Release
+      platform: x64
+      CXX_FLAGS: "/permissive- /std:c++latest /Zc:__cplusplus /utf-8 /F4000000 /W4 /WX"
+      LINKER_FLAGS: "/STACK:4000000"
+      CMAKE_OPTIONS: ""
+      GENERATOR: Visual Studio 15 2017
+
+init:
+  - cmake --version
+  - msbuild /version
+
+install:
+  - if "%platform%"=="x86"    set GENERATOR_PLATFORM=Win32
+
+before_build:
+  # for with_win_header build, inject the inclusion of Windows.h to the single-header library
+  - ps: if ($env:name -Eq "with_win_header") { $header_path = "single_include\nlohmann\json.hpp" }
+  - ps: if ($env:name -Eq "with_win_header") { "#include <Windows.h>`n" + (Get-Content $header_path | Out-String) | Set-Content $header_path }
+  - cmake . -G "%GENERATOR%" -A "%GENERATOR_PLATFORM%" -DCMAKE_CXX_FLAGS="%CXX_FLAGS%" -DCMAKE_EXE_LINKER_FLAGS="%LINKER_FLAGS%" -DCMAKE_IGNORE_PATH="C:/Program Files/Git/usr/bin" -DJSON_BuildTests=On "%CMAKE_OPTIONS%"
+
+build_script:
+  - cmake --build . --config "%configuration%"
+
+test_script:
+  - if "%configuration%"=="Release" ctest -C "%configuration%" -V -j
+  # On Debug builds, skip test-unicode_all
+  # as it is extremely slow to run and cause
+  # occasional timeouts on AppVeyor.
+  # More info: https://github.com/nlohmann/json/pull/1570
+  - if "%configuration%"=="Debug" ctest --exclude-regex "test-unicode" -C "%configuration%" -V -j

benchmarks/CMakeLists.txt

@@ -0,0 +1,33 @@
+cmake_minimum_required(VERSION 3.11)
+project(JSON_Benchmarks LANGUAGES CXX)
+
+# set compiler flags
+if((CMAKE_CXX_COMPILER_ID MATCHES GNU) OR (CMAKE_CXX_COMPILER_ID MATCHES Clang))
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -flto -DNDEBUG -O3")
+endif()
+
+# configure Google Benchmarks
+include(FetchContent)
+FetchContent_Declare(
+    benchmark
+    GIT_REPOSITORY https://github.com/google/benchmark.git
+    GIT_TAG origin/main
+    GIT_SHALLOW TRUE
+)
+
+FetchContent_GetProperties(benchmark)
+if(NOT benchmark_POPULATED)
+    FetchContent_Populate(benchmark)
+    set(BENCHMARK_ENABLE_TESTING OFF CACHE INTERNAL "" FORCE)
+    add_subdirectory(${benchmark_SOURCE_DIR} ${benchmark_BINARY_DIR})
+endif()
+
+# download test data
+include(${CMAKE_SOURCE_DIR}/../cmake/download_test_data.cmake)
+
+# benchmark binary
+add_executable(json_benchmarks src/benchmarks.cpp)
+target_compile_features(json_benchmarks PRIVATE cxx_std_11)
+target_link_libraries(json_benchmarks benchmark ${CMAKE_THREAD_LIBS_INIT})
+add_dependencies(json_benchmarks download_test_data)
+target_include_directories(json_benchmarks PRIVATE ${CMAKE_SOURCE_DIR}/../single_include ${CMAKE_BINARY_DIR}/include)

benchmarks/src/benchmarks.cpp

@@ -0,0 +1,110 @@
+#include "benchmark/benchmark.h"
+#include <nlohmann/json.hpp>
+#include <fstream>
+#include <test_data.hpp>
+
+using json = nlohmann::json;
+
+//////////////////////////////////////////////////////////////////////////////
+// parse JSON from file
+//////////////////////////////////////////////////////////////////////////////
+
+static void ParseFile(benchmark::State& state, const char* filename)
+{
+    while (state.KeepRunning())
+    {
+        state.PauseTiming();
+        auto* f = new std::ifstream(filename);
+        auto* j = new json();
+        state.ResumeTiming();
+
+        *j = json::parse(*f);
+
+        state.PauseTiming();
+        delete f;
+        delete j;
+        state.ResumeTiming();
+    }
+
+    std::ifstream file(filename, std::ios::binary | std::ios::ate);
+    state.SetBytesProcessed(state.iterations() * file.tellg());
+}
+BENCHMARK_CAPTURE(ParseFile, jeopardy,          TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json");
+BENCHMARK_CAPTURE(ParseFile, canada,            TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json");
+BENCHMARK_CAPTURE(ParseFile, citm_catalog,      TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json");
+BENCHMARK_CAPTURE(ParseFile, twitter,           TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json");
+BENCHMARK_CAPTURE(ParseFile, floats,            TEST_DATA_DIRECTORY "/regression/floats.json");
+BENCHMARK_CAPTURE(ParseFile, signed_ints,       TEST_DATA_DIRECTORY "/regression/signed_ints.json");
+BENCHMARK_CAPTURE(ParseFile, unsigned_ints,     TEST_DATA_DIRECTORY "/regression/unsigned_ints.json");
+BENCHMARK_CAPTURE(ParseFile, small_signed_ints, TEST_DATA_DIRECTORY "/regression/small_signed_ints.json");
+
+//////////////////////////////////////////////////////////////////////////////
+// parse JSON from string
+//////////////////////////////////////////////////////////////////////////////
+
+static void ParseString(benchmark::State& state, const char* filename)
+{
+    std::ifstream f(filename);
+    std::string str((std::istreambuf_iterator<char>(f)), std::istreambuf_iterator<char>());
+
+    while (state.KeepRunning())
+    {
+        state.PauseTiming();
+        auto* j = new json();
+        state.ResumeTiming();
+
+        *j = json::parse(str);
+
+        state.PauseTiming();
+        delete j;
+        state.ResumeTiming();
+    }
+
+    state.SetBytesProcessed(state.iterations() * str.size());
+}
+BENCHMARK_CAPTURE(ParseString, jeopardy,          TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json");
+BENCHMARK_CAPTURE(ParseString, canada,            TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json");
+BENCHMARK_CAPTURE(ParseString, citm_catalog,      TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json");
+BENCHMARK_CAPTURE(ParseString, twitter,           TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json");
+BENCHMARK_CAPTURE(ParseString, floats,            TEST_DATA_DIRECTORY "/regression/floats.json");
+BENCHMARK_CAPTURE(ParseString, signed_ints,       TEST_DATA_DIRECTORY "/regression/signed_ints.json");
+BENCHMARK_CAPTURE(ParseString, unsigned_ints,     TEST_DATA_DIRECTORY "/regression/unsigned_ints.json");
+BENCHMARK_CAPTURE(ParseString, small_signed_ints, TEST_DATA_DIRECTORY "/regression/small_signed_ints.json");
+
+
+//////////////////////////////////////////////////////////////////////////////
+// serialize JSON
+//////////////////////////////////////////////////////////////////////////////
+
+static void Dump(benchmark::State& state, const char* filename, int indent)
+{
+    std::ifstream f(filename);
+    std::string str((std::istreambuf_iterator<char>(f)), std::istreambuf_iterator<char>());
+    json j = json::parse(str);
+
+    while (state.KeepRunning())
+    {
+        j.dump(indent);
+    }
+
+    state.SetBytesProcessed(state.iterations() * j.dump(indent).size());
+}
+BENCHMARK_CAPTURE(Dump, jeopardy / -,          TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json",                 -1);
+BENCHMARK_CAPTURE(Dump, jeopardy / 4,          TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json",                 4);
+BENCHMARK_CAPTURE(Dump, canada / -,            TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json",       -1);
+BENCHMARK_CAPTURE(Dump, canada / 4,            TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json",       4);
+BENCHMARK_CAPTURE(Dump, citm_catalog / -,      TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json", -1);
+BENCHMARK_CAPTURE(Dump, citm_catalog / 4,      TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json", 4);
+BENCHMARK_CAPTURE(Dump, twitter / -,           TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json",      -1);
+BENCHMARK_CAPTURE(Dump, twitter / 4,           TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json",      4);
+BENCHMARK_CAPTURE(Dump, floats / -,            TEST_DATA_DIRECTORY "/regression/floats.json",                 -1);
+BENCHMARK_CAPTURE(Dump, floats / 4,            TEST_DATA_DIRECTORY "/regression/floats.json",                 4);
+BENCHMARK_CAPTURE(Dump, signed_ints / -,       TEST_DATA_DIRECTORY "/regression/signed_ints.json",            -1);
+BENCHMARK_CAPTURE(Dump, signed_ints / 4,       TEST_DATA_DIRECTORY "/regression/signed_ints.json",            4);
+BENCHMARK_CAPTURE(Dump, unsigned_ints / -,     TEST_DATA_DIRECTORY "/regression/unsigned_ints.json",          -1);
+BENCHMARK_CAPTURE(Dump, unsigned_ints / 4,     TEST_DATA_DIRECTORY "/regression/unsigned_ints.json",          4);
+BENCHMARK_CAPTURE(Dump, small_signed_ints / -, TEST_DATA_DIRECTORY "/regression/small_signed_ints.json",      -1);
+BENCHMARK_CAPTURE(Dump, small_signed_ints / 4, TEST_DATA_DIRECTORY "/regression/small_signed_ints.json",      4);
+
+
+BENCHMARK_MAIN();

cmake/ci.cmake

@@ -0,0 +1,835 @@
+# number of parallel jobs for CTest
+set(N 10)
+
+###############################################################################
+# Needed tools.
+###############################################################################
+
+include(FindPython3)
+find_package(Python3 COMPONENTS Interpreter)
+
+find_program(ASTYLE_TOOL NAMES astyle)
+execute_process(COMMAND ${ASTYLE_TOOL} --version OUTPUT_VARIABLE ASTYLE_TOOL_VERSION ERROR_VARIABLE ASTYLE_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" ASTYLE_TOOL_VERSION "${ASTYLE_TOOL_VERSION}")
+message(STATUS "🔖 Artistic Style ${ASTYLE_TOOL_VERSION} (${ASTYLE_TOOL})")
+
+find_program(CLANG_TOOL NAMES clang++-HEAD clang++-12 clang++-11 clang++)
+execute_process(COMMAND ${CLANG_TOOL} --version OUTPUT_VARIABLE CLANG_TOOL_VERSION ERROR_VARIABLE CLANG_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" CLANG_TOOL_VERSION "${CLANG_TOOL_VERSION}")
+message(STATUS "🔖 Clang ${CLANG_TOOL_VERSION} (${CLANG_TOOL})")
+
+find_program(CLANG_TIDY_TOOL NAMES clang-tidy-12 clang-tidy-11 clang-tidy)
+execute_process(COMMAND ${CLANG_TIDY_TOOL} --version OUTPUT_VARIABLE CLANG_TIDY_TOOL_VERSION ERROR_VARIABLE CLANG_TIDY_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" CLANG_TIDY_TOOL_VERSION "${CLANG_TIDY_TOOL_VERSION}")
+message(STATUS "🔖 Clang-Tidy ${CLANG_TIDY_TOOL_VERSION} (${CLANG_TIDY_TOOL})")
+
+message(STATUS "🔖 CMake ${CMAKE_VERSION} (${CMAKE_COMMAND})")
+
+find_program(CPPCHECK_TOOL NAMES cppcheck)
+execute_process(COMMAND ${CPPCHECK_TOOL} --version OUTPUT_VARIABLE CPPCHECK_TOOL_VERSION ERROR_VARIABLE CPPCHECK_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" CPPCHECK_TOOL_VERSION "${CPPCHECK_TOOL_VERSION}")
+message(STATUS "🔖 Cppcheck ${CPPCHECK_TOOL_VERSION} (${CPPCHECK_TOOL})")
+
+find_program(GCC_TOOL NAMES g++-HEAD g++-11 g++-latest)
+execute_process(COMMAND ${GCC_TOOL} --version OUTPUT_VARIABLE GCC_TOOL_VERSION ERROR_VARIABLE GCC_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" GCC_TOOL_VERSION "${GCC_TOOL_VERSION}")
+message(STATUS "🔖 GCC ${GCC_TOOL_VERSION} (${GCC_TOOL})")
+
+find_program(GCOV_TOOL NAMES gcov-HEAD gcov-11 gcov-10 gcov)
+execute_process(COMMAND ${GCOV_TOOL} --version OUTPUT_VARIABLE GCOV_TOOL_VERSION ERROR_VARIABLE GCOV_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" GCOV_TOOL_VERSION "${GCOV_TOOL_VERSION}")
+message(STATUS "🔖 GCOV ${GCOV_TOOL_VERSION} (${GCOV_TOOL})")
+
+find_program(GIT_TOOL NAMES git)
+execute_process(COMMAND ${GIT_TOOL} --version OUTPUT_VARIABLE GIT_TOOL_VERSION ERROR_VARIABLE GIT_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" GIT_TOOL_VERSION "${GIT_TOOL_VERSION}")
+message(STATUS "🔖 Git ${GIT_TOOL_VERSION} (${GIT_TOOL})")
+
+find_program(IWYU_TOOL NAMES include-what-you-use iwyu)
+execute_process(COMMAND ${IWYU_TOOL} --version OUTPUT_VARIABLE IWYU_TOOL_VERSION ERROR_VARIABLE IWYU_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" IWYU_TOOL_VERSION "${IWYU_TOOL_VERSION}")
+message(STATUS "🔖 include-what-you-use ${IWYU_TOOL_VERSION} (${IWYU_TOOL})")
+
+find_program(INFER_TOOL NAMES infer)
+execute_process(COMMAND ${INFER_TOOL} --version OUTPUT_VARIABLE INFER_TOOL_VERSION ERROR_VARIABLE INFER_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" INFER_TOOL_VERSION "${INFER_TOOL_VERSION}")
+message(STATUS "🔖 Infer ${INFER_TOOL_VERSION} (${INFER_TOOL})")
+
+find_program(LCOV_TOOL NAMES lcov)
+execute_process(COMMAND ${LCOV_TOOL} --version OUTPUT_VARIABLE LCOV_TOOL_VERSION ERROR_VARIABLE LCOV_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" LCOV_TOOL_VERSION "${LCOV_TOOL_VERSION}")
+message(STATUS "🔖 LCOV ${LCOV_TOOL_VERSION} (${LCOV_TOOL})")
+
+find_program(NINJA_TOOL NAMES ninja)
+execute_process(COMMAND ${NINJA_TOOL} --version OUTPUT_VARIABLE NINJA_TOOL_VERSION ERROR_VARIABLE NINJA_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" NINJA_TOOL_VERSION "${NINJA_TOOL_VERSION}")
+message(STATUS "🔖 Ninja ${NINJA_TOOL_VERSION} (${NINJA_TOOL})")
+
+find_program(OCLINT_TOOL NAMES oclint-json-compilation-database)
+find_program(OCLINT_VERSION_TOOL NAMES oclint)
+execute_process(COMMAND ${OCLINT_VERSION_TOOL} --version OUTPUT_VARIABLE OCLINT_TOOL_VERSION ERROR_VARIABLE OCLINT_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" OCLINT_TOOL_VERSION "${OCLINT_TOOL_VERSION}")
+message(STATUS "🔖 OCLint ${OCLINT_TOOL_VERSION} (${OCLINT_TOOL})")
+
+find_program(VALGRIND_TOOL NAMES valgrind)
+execute_process(COMMAND ${VALGRIND_TOOL} --version OUTPUT_VARIABLE VALGRIND_TOOL_VERSION ERROR_VARIABLE VALGRIND_TOOL_VERSION)
+string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" VALGRIND_TOOL_VERSION "${VALGRIND_TOOL_VERSION}")
+message(STATUS "🔖 Valgrind ${VALGRIND_TOOL_VERSION} (${VALGRIND_TOOL})")
+
+find_program(GENHTML_TOOL NAMES genhtml)
+find_program(PLOG_CONVERTER_TOOL NAMES plog-converter)
+find_program(PVS_STUDIO_ANALYZER_TOOL NAMES pvs-studio-analyzer)
+find_program(SCAN_BUILD_TOOL NAMES scan-build-11 scan-build)
+
+# the individual source files
+file(GLOB_RECURSE SRC_FILES ${PROJECT_SOURCE_DIR}/include/nlohmann/*.hpp)
+
+###############################################################################
+# Thorough check with recent compilers
+###############################################################################
+
+# Ignored Clang warnings:
+# -Wno-c++98-compat               The library targets C++11.
+# -Wno-c++98-compat-pedantic      The library targets C++11.
+# -Wno-deprecated-declarations    The library contains annotations for deprecated functions.
+# -Wno-extra-semi-stmt            The library uses std::assert which triggers this warning.
+# -Wno-padded                     We do not care about padding warnings.
+# -Wno-covered-switch-default     All switches list all cases and a default case.
+# -Wno-weak-vtables               The library is header-only.
+
+set(CLANG_CXXFLAGS "-std=c++11                        \
+    -Werror                                           \
+    -Weverything                                      \
+    -Wno-c++98-compat                                    \
+    -Wno-c++98-compat-pedantic                           \
+    -Wno-deprecated-declarations                         \
+    -Wno-extra-semi-stmt                                 \
+    -Wno-padded                                          \
+    -Wno-covered-switch-default                          \
+    -Wno-weak-vtables                                    \
+")
+
+# Ignored GCC warnings:
+# -Wno-abi-tag                    We do not care about ABI tags.
+# -Wno-aggregate-return           The library uses aggregate returns.
+# -Wno-long-long                  The library uses the long long type to interface with system functions.
+# -Wno-namespaces                 The library uses namespaces.
+# -Wno-padded                     We do not care about padding warnings.
+# -Wno-system-headers             We do not care about warnings in system headers.
+# -Wno-templates                  The library uses templates.
+
+set(GCC_CXXFLAGS "-std=c++11                          \
+    -pedantic                                         \
+    -Werror                                           \
+    --all-warnings                                    \
+    --extra-warnings                                  \
+    -W                                                \
+    -WNSObject-attribute                              \
+    -Wno-abi-tag                                         \
+    -Waddress                                         \
+    -Waddress-of-packed-member                        \
+    -Wno-aggregate-return                                \
+    -Waggressive-loop-optimizations                   \
+    -Waligned-new=all                                 \
+    -Wall                                             \
+    -Walloc-zero                                      \
+    -Walloca                                          \
+    -Wanalyzer-double-fclose                          \
+    -Wanalyzer-double-free                            \
+    -Wanalyzer-exposure-through-output-file           \
+    -Wanalyzer-file-leak                              \
+    -Wanalyzer-free-of-non-heap                       \
+    -Wanalyzer-malloc-leak                            \
+    -Wanalyzer-mismatching-deallocation               \
+    -Wanalyzer-null-argument                          \
+    -Wanalyzer-null-dereference                       \
+    -Wanalyzer-possible-null-argument                 \
+    -Wanalyzer-possible-null-dereference              \
+    -Wanalyzer-shift-count-negative                   \
+    -Wanalyzer-shift-count-overflow                   \
+    -Wanalyzer-stale-setjmp-buffer                    \
+    -Wanalyzer-tainted-array-index                    \
+    -Wanalyzer-too-complex                            \
+    -Wanalyzer-unsafe-call-within-signal-handler      \
+    -Wanalyzer-use-after-free                         \
+    -Wanalyzer-use-of-pointer-in-stale-stack-frame    \
+    -Wanalyzer-write-to-const                         \
+    -Wanalyzer-write-to-string-literal                \
+    -Warith-conversion                                \
+    -Warray-bounds                                    \
+    -Warray-bounds=2                                  \
+    -Warray-parameter=2                               \
+    -Wattribute-alias=2                               \
+    -Wattribute-warning                               \
+    -Wattributes                                      \
+    -Wbool-compare                                    \
+    -Wbool-operation                                  \
+    -Wbuiltin-declaration-mismatch                    \
+    -Wbuiltin-macro-redefined                         \
+    -Wc++0x-compat                                    \
+    -Wc++11-compat                                    \
+    -Wc++14-compat                                    \
+    -Wc++17-compat                                    \
+    -Wc++1z-compat                                    \
+    -Wc++20-compat                                    \
+    -Wc++2a-compat                                    \
+    -Wcannot-profile                                  \
+    -Wcast-align                                      \
+    -Wcast-align=strict                               \
+    -Wcast-function-type                              \
+    -Wcast-qual                                       \
+    -Wcatch-value=3                                   \
+    -Wchar-subscripts                                 \
+    -Wclass-conversion                                \
+    -Wclass-memaccess                                 \
+    -Wclobbered                                       \
+    -Wcomma-subscript                                 \
+    -Wcomment                                         \
+    -Wcomments                                        \
+    -Wconditionally-supported                         \
+    -Wconversion                                      \
+    -Wconversion-null                                 \
+    -Wcoverage-mismatch                               \
+    -Wcpp                                             \
+    -Wctad-maybe-unsupported                          \
+    -Wctor-dtor-privacy                               \
+    -Wdangling-else                                   \
+    -Wdate-time                                       \
+    -Wdelete-incomplete                               \
+    -Wdelete-non-virtual-dtor                         \
+    -Wdeprecated                                      \
+    -Wdeprecated-copy                                 \
+    -Wdeprecated-copy-dtor                            \
+    -Wdeprecated-declarations                         \
+    -Wdeprecated-enum-enum-conversion                 \
+    -Wdeprecated-enum-float-conversion                \
+    -Wdisabled-optimization                           \
+    -Wdiv-by-zero                                     \
+    -Wdouble-promotion                                \
+    -Wduplicated-branches                             \
+    -Wduplicated-cond                                 \
+    -Weffc++                                          \
+    -Wempty-body                                      \
+    -Wendif-labels                                    \
+    -Wenum-compare                                    \
+    -Wenum-conversion                                 \
+    -Wexpansion-to-defined                            \
+    -Wextra                                           \
+    -Wextra-semi                                      \
+    -Wfloat-conversion                                \
+    -Wfloat-equal                                     \
+    -Wformat-contains-nul                             \
+    -Wformat-diag                                     \
+    -Wformat-extra-args                               \
+    -Wformat-nonliteral                               \
+    -Wformat-overflow=2                               \
+    -Wformat-security                                 \
+    -Wformat-signedness                               \
+    -Wformat-truncation=2                             \
+    -Wformat-y2k                                      \
+    -Wformat-zero-length                              \
+    -Wformat=2                                        \
+    -Wframe-address                                   \
+    -Wfree-nonheap-object                             \
+    -Whsa                                             \
+    -Wif-not-aligned                                  \
+    -Wignored-attributes                              \
+    -Wignored-qualifiers                              \
+    -Wimplicit-fallthrough=5                          \
+    -Winaccessible-base                               \
+    -Winherited-variadic-ctor                         \
+    -Winit-list-lifetime                              \
+    -Winit-self                                       \
+    -Winline                                          \
+    -Wint-in-bool-context                             \
+    -Wint-to-pointer-cast                             \
+    -Winvalid-memory-model                            \
+    -Winvalid-offsetof                                \
+    -Winvalid-pch                                     \
+    -Wliteral-suffix                                  \
+    -Wlogical-not-parentheses                         \
+    -Wlogical-op                                      \
+    -Wno-long-long                                       \
+    -Wlto-type-mismatch                               \
+    -Wmain                                            \
+    -Wmaybe-uninitialized                             \
+    -Wmemset-elt-size                                 \
+    -Wmemset-transposed-args                          \
+    -Wmisleading-indentation                          \
+    -Wmismatched-dealloc                              \
+    -Wmismatched-new-delete                           \
+    -Wmismatched-tags                                 \
+    -Wmissing-attributes                              \
+    -Wmissing-braces                                  \
+    -Wmissing-declarations                            \
+    -Wmissing-field-initializers                      \
+    -Wmissing-include-dirs                            \
+    -Wmissing-profile                                 \
+    -Wmultichar                                       \
+    -Wmultiple-inheritance                            \
+    -Wmultistatement-macros                           \
+    -Wno-namespaces                                      \
+    -Wnarrowing                                       \
+    -Wnoexcept                                        \
+    -Wnoexcept-type                                   \
+    -Wnon-template-friend                             \
+    -Wnon-virtual-dtor                                \
+    -Wnonnull                                         \
+    -Wnonnull-compare                                 \
+    -Wnormalized=nfkc                                 \
+    -Wnull-dereference                                \
+    -Wodr                                             \
+    -Wold-style-cast                                  \
+    -Wopenmp-simd                                     \
+    -Woverflow                                        \
+    -Woverlength-strings                              \
+    -Woverloaded-virtual                              \
+    -Wpacked                                          \
+    -Wpacked-bitfield-compat                          \
+    -Wpacked-not-aligned                              \
+    -Wno-padded                                          \
+    -Wparentheses                                     \
+    -Wpedantic                                        \
+    -Wpessimizing-move                                \
+    -Wplacement-new=2                                 \
+    -Wpmf-conversions                                 \
+    -Wpointer-arith                                   \
+    -Wpointer-compare                                 \
+    -Wpragmas                                         \
+    -Wprio-ctor-dtor                                  \
+    -Wpsabi                                           \
+    -Wrange-loop-construct                            \
+    -Wredundant-decls                                 \
+    -Wredundant-move                                  \
+    -Wredundant-tags                                  \
+    -Wregister                                        \
+    -Wreorder                                         \
+    -Wrestrict                                        \
+    -Wreturn-local-addr                               \
+    -Wreturn-type                                     \
+    -Wscalar-storage-order                            \
+    -Wsequence-point                                  \
+    -Wshadow=compatible-local                         \
+    -Wshadow=global                                   \
+    -Wshadow=local                                    \
+    -Wshift-count-negative                            \
+    -Wshift-count-overflow                            \
+    -Wshift-negative-value                            \
+    -Wshift-overflow=2                                \
+    -Wsign-compare                                    \
+    -Wsign-conversion                                 \
+    -Wsign-promo                                      \
+    -Wsized-deallocation                              \
+    -Wsizeof-array-argument                           \
+    -Wsizeof-array-div                                \
+    -Wsizeof-pointer-div                              \
+    -Wsizeof-pointer-memaccess                        \
+    -Wstack-protector                                 \
+    -Wstrict-aliasing                                 \
+    -Wstrict-aliasing=3                               \
+    -Wstrict-null-sentinel                            \
+    -Wstrict-overflow                                 \
+    -Wstrict-overflow=5                               \
+    -Wstring-compare                                  \
+    -Wstringop-overflow=4                             \
+    -Wstringop-overread                               \
+    -Wstringop-truncation                             \
+    -Wsubobject-linkage                               \
+    -Wsuggest-attribute=cold                          \
+    -Wsuggest-attribute=const                         \
+    -Wsuggest-attribute=format                        \
+    -Wsuggest-attribute=malloc                        \
+    -Wsuggest-attribute=noreturn                      \
+    -Wsuggest-attribute=pure                          \
+    -Wsuggest-final-methods                           \
+    -Wsuggest-final-types                             \
+    -Wsuggest-override                                \
+    -Wswitch                                          \
+    -Wswitch-bool                                     \
+    -Wswitch-default                                  \
+    -Wswitch-enum                                     \
+    -Wswitch-outside-range                            \
+    -Wswitch-unreachable                              \
+    -Wsync-nand                                       \
+    -Wsynth                                           \
+    -Wno-system-headers                                  \
+    -Wtautological-compare                            \
+    -Wno-templates                                       \
+    -Wterminate                                       \
+    -Wtrampolines                                     \
+    -Wtrigraphs                                       \
+    -Wtsan                                            \
+    -Wtype-limits                                     \
+    -Wundef                                           \
+    -Wuninitialized                                   \
+    -Wunknown-pragmas                                 \
+    -Wunreachable-code                                \
+    -Wunsafe-loop-optimizations                       \
+    -Wunused                                          \
+    -Wunused-but-set-parameter                        \
+    -Wunused-but-set-variable                         \
+    -Wunused-const-variable=2                         \
+    -Wunused-function                                 \
+    -Wunused-label                                    \
+    -Wunused-local-typedefs                           \
+    -Wunused-macros                                   \
+    -Wunused-parameter                                \
+    -Wunused-result                                   \
+    -Wunused-value                                    \
+    -Wunused-variable                                 \
+    -Wuseless-cast                                    \
+    -Wvarargs                                         \
+    -Wvariadic-macros                                 \
+    -Wvector-operation-performance                    \
+    -Wvexing-parse                                    \
+    -Wvirtual-inheritance                             \
+    -Wvirtual-move-assign                             \
+    -Wvla                                             \
+    -Wvla-parameter                                   \
+    -Wvolatile                                        \
+    -Wvolatile-register-var                           \
+    -Wwrite-strings                                   \
+    -Wzero-as-null-pointer-constant                   \
+    -Wzero-length-bounds                              \
+")
+
+add_custom_target(ci_test_gcc
+    COMMAND CXX=${GCC_TOOL} CXXFLAGS=${GCC_CXXFLAGS} ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON -DJSON_MultipleHeaders=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_gcc
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_gcc
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_gcc && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with GCC using maximal warning flags"
+)
+
+add_custom_target(ci_test_clang
+    COMMAND CXX=${CLANG_TOOL} CXXFLAGS=${CLANG_CXXFLAGS} ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON -DJSON_MultipleHeaders=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_clang
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_clang
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_clang && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with Clang using maximal warning flags"
+)
+
+###############################################################################
+# Different C++ Standards.
+###############################################################################
+
+foreach(CXX_STANDARD 11 14 17 20)
+    add_custom_target(ci_test_gcc_cxx${CXX_STANDARD}
+        COMMAND CXX=${GCC_TOOL} ${CMAKE_COMMAND}
+            -DCMAKE_BUILD_TYPE=Debug -GNinja
+            -DCMAKE_CXX_STANDARD=${CXX_STANDARD} -DCMAKE_CXX_STANDARD_REQUIRED=ON
+            -DJSON_BuildTests=ON -DJSON_FastTests=ON
+            -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_gcc_cxx${CXX_STANDARD}
+        COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_gcc_cxx${CXX_STANDARD}
+        COMMAND cd ${PROJECT_BINARY_DIR}/build_gcc_cxx${CXX_STANDARD} && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+        COMMENT "Compile and test with GCC for C++${CXX_STANDARD}"
+    )
+
+    add_custom_target(ci_test_clang_cxx${CXX_STANDARD}
+        COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+            -DCMAKE_BUILD_TYPE=Debug -GNinja
+            -DCMAKE_CXX_STANDARD=${CXX_STANDARD} -DCMAKE_CXX_STANDARD_REQUIRED=ON
+            -DJSON_BuildTests=ON
+            -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_clang_cxx${CXX_STANDARD}
+        COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_clang_cxx${CXX_STANDARD}
+        COMMAND cd ${PROJECT_BINARY_DIR}/build_clang_cxx${CXX_STANDARD} && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+        COMMENT "Compile and test with Clang for C++${CXX_STANDARD}"
+    )
+endforeach()
+
+###############################################################################
+# Disable exceptions.
+###############################################################################
+
+add_custom_target(ci_test_noexceptions
+    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+    -DCMAKE_BUILD_TYPE=Debug -GNinja
+    -DJSON_BuildTests=ON -DJSON_MultipleHeaders=ON -DCMAKE_CXX_FLAGS=-DJSON_NOEXCEPTION -DDOCTEST_TEST_FILTER=--no-throw
+    -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_noexceptions
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_noexceptions
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_noexceptions && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with exceptions switched off"
+)
+
+###############################################################################
+# Disable implicit conversions.
+###############################################################################
+
+add_custom_target(ci_test_noimplicitconversions
+    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+    -DCMAKE_BUILD_TYPE=Debug -GNinja
+    -DJSON_BuildTests=ON -DJSON_MultipleHeaders=ON -DJSON_ImplicitConversions=OFF
+    -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_noimplicitconversions
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_noimplicitconversions
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_noimplicitconversions && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with implicit conversions switched off"
+)
+
+###############################################################################
+# Enable improved diagnostics.
+###############################################################################
+
+add_custom_target(ci_test_diagnostics
+    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+    -DCMAKE_BUILD_TYPE=Debug -GNinja
+    -DJSON_BuildTests=ON -DJSON_MultipleHeaders=ON -DJSON_Diagnostics=ON
+    -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_diagnostics
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_diagnostics
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_diagnostics && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with improved diagnostics enabled"
+)
+
+###############################################################################
+# Coverage.
+###############################################################################
+
+add_custom_target(ci_test_coverage
+    COMMAND CXX=g++ ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja -DCMAKE_CXX_FLAGS="--coverage;-fprofile-arcs;-ftest-coverage"
+        -DJSON_BuildTests=ON -DJSON_MultipleHeaders=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_coverage
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_coverage
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_coverage && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+
+    COMMAND ${LCOV_TOOL} --directory . --capture --output-file json.info --rc lcov_branch_coverage=1
+    COMMAND ${LCOV_TOOL} -e json.info ${SRC_FILES} --output-file json.info.filtered --rc lcov_branch_coverage=1
+    COMMAND ${CMAKE_SOURCE_DIR}/test/thirdparty/imapdl/filterbr.py json.info.filtered > json.info.filtered.noexcept
+    COMMAND genhtml --title "JSON for Modern C++" --legend --demangle-cpp --output-directory html --show-details --branch-coverage json.info.filtered.noexcept
+
+    COMMENT "Compile and test with coverage"
+)
+
+###############################################################################
+# Sanitizers.
+###############################################################################
+
+set(CLANG_CXX_FLAGS_SANITIZER "-g -O1 -fsanitize=address -fsanitize=undefined -fsanitize=integer -fsanitize=nullability -fno-omit-frame-pointer -fno-sanitize-recover=all -fno-sanitize=unsigned-integer-overflow -fno-sanitize=unsigned-shift-base")
+
+add_custom_target(ci_test_clang_sanitizer
+    COMMAND CXX=${CLANG_TOOL} CXXFLAGS=${CLANG_CXX_FLAGS_SANITIZER} ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_clang_sanitizer
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_clang_sanitizer
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_clang_sanitizer && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with sanitizers"
+)
+
+###############################################################################
+# Check if header is amalgamated and sources are properly indented.
+###############################################################################
+
+set(ASTYLE_FLAGS --style=allman --indent=spaces=4 --indent-modifiers --indent-switches --indent-preproc-block --indent-preproc-define --indent-col1-comments --pad-oper --pad-header --align-pointer=type --align-reference=type --add-brackets --convert-tabs --close-templates --lineend=linux --preserve-date --formatted)
+
+file(GLOB_RECURSE INDENT_FILES
+    ${PROJECT_SOURCE_DIR}/include/nlohmann/*.hpp
+    ${PROJECT_SOURCE_DIR}/test/src/*.cpp
+    ${PROJECT_SOURCE_DIR}/test/src/*.hpp
+    ${PROJECT_SOURCE_DIR}/benchmarks/src/benchmarks.cpp
+    ${PROJECT_SOURCE_DIR}/doc/examples/*.cpp
+)
+
+add_custom_target(ci_test_amalgamation
+    COMMAND rm -fr ${PROJECT_SOURCE_DIR}/single_include/nlohmann/json.hpp~
+    COMMAND cp ${PROJECT_SOURCE_DIR}/single_include/nlohmann/json.hpp ${PROJECT_SOURCE_DIR}/single_include/nlohmann/json.hpp~
+    COMMAND ${Python3_EXECUTABLE} ${PROJECT_SOURCE_DIR}/third_party/amalgamate/amalgamate.py -c ${PROJECT_SOURCE_DIR}/third_party/amalgamate/config.json -s .
+    COMMAND ${ASTYLE_TOOL} ${ASTYLE_FLAGS} --suffix=none --quiet ${PROJECT_SOURCE_DIR}/single_include/nlohmann/json.hpp
+    COMMAND diff ${PROJECT_SOURCE_DIR}/single_include/nlohmann/json.hpp~ ${PROJECT_SOURCE_DIR}/single_include/nlohmann/json.hpp
+
+    COMMAND ${ASTYLE_TOOL} ${ASTYLE_FLAGS} ${INDENT_FILES}
+    COMMAND cd ${PROJECT_SOURCE_DIR} && for FILE in `find . -name '*.orig'`\; do false \; done
+
+    WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
+    COMMENT "Check amalagamation and indentation"
+)
+
+###############################################################################
+# Valgrind.
+###############################################################################
+
+add_custom_target(ci_test_valgrind
+    COMMAND CXX=${GCC_TOOL} ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON -DJSON_Valgrind=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_valgrind
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_valgrind
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_valgrind && ${CMAKE_CTEST_COMMAND} -L valgrind --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with Valgrind"
+)
+
+###############################################################################
+# Check code with Clang Static Analyzer.
+###############################################################################
+
+set(CLANG_ANALYZER_CHECKS "fuchsia.HandleChecker,nullability.NullableDereferenced,nullability.NullablePassedToNonnull,nullability.NullableReturnedFromNonnull,optin.cplusplus.UninitializedObject,optin.cplusplus.VirtualCall,optin.mpi.MPI-Checker,optin.osx.OSObjectCStyleCast,optin.osx.cocoa.localizability.EmptyLocalizationContextChecker,optin.osx.cocoa.localizability.NonLocalizedStringChecker,optin.performance.GCDAntipattern,optin.performance.Padding,optin.portability.UnixAPI,security.FloatLoopCounter,security.insecureAPI.DeprecatedOrUnsafeBufferHandling,security.insecureAPI.bcmp,security.insecureAPI.bcopy,security.insecureAPI.bzero,security.insecureAPI.rand,security.insecureAPI.strcpy,valist.CopyToSelf,valist.Uninitialized,valist.Unterminated,webkit.NoUncountedMemberChecker,webkit.RefCntblBaseVirtualDtor,core.CallAndMessage,core.DivideZero,core.NonNullParamChecker,core.NullDereference,core.StackAddressEscape,core.UndefinedBinaryOperatorResult,core.VLASize,core.uninitialized.ArraySubscript,core.uninitialized.Assign,core.uninitialized.Branch,core.uninitialized.CapturedBlockVariable,core.uninitialized.UndefReturn,cplusplus.InnerPointer,cplusplus.Move,cplusplus.NewDelete,cplusplus.NewDeleteLeaks,cplusplus.PlacementNew,cplusplus.PureVirtualCall,deadcode.DeadStores,nullability.NullPassedToNonnull,nullability.NullReturnedFromNonnull,osx.API,osx.MIG,osx.NumberObjectConversion,osx.OSObjectRetainCount,osx.ObjCProperty,osx.SecKeychainAPI,osx.cocoa.AtSync,osx.cocoa.AutoreleaseWrite,osx.cocoa.ClassRelease,osx.cocoa.Dealloc,osx.cocoa.IncompatibleMethodTypes,osx.cocoa.Loops,osx.cocoa.MissingSuperCall,osx.cocoa.NSAutoreleasePool,osx.cocoa.NSError,osx.cocoa.NilArg,osx.cocoa.NonNilReturnValue,osx.cocoa.ObjCGenerics,osx.cocoa.RetainCount,osx.cocoa.RunLoopAutoreleaseLeak,osx.cocoa.SelfInit,osx.cocoa.SuperDealloc,osx.cocoa.UnusedIvars,osx.cocoa.VariadicMethodTypes,osx.coreFoundation.CFError,osx.coreFoundation.CFNumber,osx.coreFoundation.CFRetainRelease,osx.coreFoundation.containers.OutOfBounds,osx.coreFoundation.containers.PointerSizedValues,security.insecureAPI.UncheckedReturn,security.insecureAPI.decodeValueOfObjCType,security.insecureAPI.getpw,security.insecureAPI.gets,security.insecureAPI.mkstemp,security.insecureAPI.mktemp,security.insecureAPI.vfork,unix.API,unix.Malloc,unix.MallocSizeof,unix.MismatchedDeallocator,unix.Vfork,unix.cstring.BadSizeArg,unix.cstring.NullArg")
+
+add_custom_target(ci_clang_analyze
+    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_clang_analyze
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_clang_analyze && ${SCAN_BUILD_TOOL} -enable-checker ${CLANG_ANALYZER_CHECKS} --use-c++=${CLANG_TOOL} -analyze-headers -o ${PROJECT_BINARY_DIR}/report ninja
+    COMMENT "Check code with Clang Analyzer"
+)
+
+###############################################################################
+# Check code with Cppcheck.
+###############################################################################
+
+add_custom_target(ci_cppcheck
+    COMMAND ${CPPCHECK_TOOL} --enable=warning --suppress=missingReturn --inline-suppr --inconclusive --force --std=c++11 ${PROJECT_SOURCE_DIR}/single_include/nlohmann/json.hpp --error-exitcode=1
+    COMMENT "Check code with Cppcheck"
+)
+
+###############################################################################
+# Check code with cpplint.
+###############################################################################
+
+add_custom_target(ci_cpplint
+    COMMAND ${Python3_EXECUTABLE} ${CMAKE_SOURCE_DIR}/third_party/cpplint/cpplint.py --filter=-whitespace,-legal,-runtime/references,-runtime/explicit,-runtime/indentation_namespace,-readability/casting,-readability/nolint --quiet --recursive ${SRC_FILES}
+    COMMENT "Check code with cpplint"
+)
+
+###############################################################################
+# Check code with OCLint.
+###############################################################################
+
+file(COPY ${PROJECT_SOURCE_DIR}/single_include/nlohmann/json.hpp DESTINATION ${PROJECT_BINARY_DIR}/src_single)
+file(RENAME ${PROJECT_BINARY_DIR}/src_single/json.hpp ${PROJECT_BINARY_DIR}/src_single/all.cpp)
+file(APPEND "${PROJECT_BINARY_DIR}/src_single/all.cpp" "\n\nint main()\n{}\n")
+
+add_executable(single_all ${PROJECT_BINARY_DIR}/src_single/all.cpp)
+target_compile_features(single_all PRIVATE cxx_std_11)
+
+add_custom_target(ci_oclint
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug
+        -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
+        -DJSON_BuildTests=OFF -DJSON_CI=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_oclint
+    COMMAND ${OCLINT_TOOL} -i ${PROJECT_BINARY_DIR}/build_oclint/src_single/all.cpp -p ${PROJECT_BINARY_DIR}/build_oclint --
+        -report-type html -enable-global-analysis --max-priority-1=0 --max-priority-2=1000 --max-priority-3=2000
+        --disable-rule=MultipleUnaryOperator
+        --disable-rule=DoubleNegative
+        --disable-rule=ShortVariableName
+        --disable-rule=GotoStatement
+        --disable-rule=LongLine
+        -o ${PROJECT_BINARY_DIR}/build_oclint/oclint_report.html
+    COMMENT "Check code with OCLint"
+)
+
+###############################################################################
+# Check code with Clang-Tidy.
+###############################################################################
+
+add_custom_target(ci_clang_tidy
+    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_CXX_CLANG_TIDY=${CLANG_TIDY_TOOL}
+        -DJSON_BuildTests=ON -DJSON_MultipleHeaders=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_clang_tidy
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_clang_tidy
+    COMMENT "Check code with Clang-Tidy"
+)
+
+###############################################################################
+# Check code with PVS-Studio Analyzer <https://www.viva64.com/en/pvs-studio/>.
+###############################################################################
+
+add_custom_target(ci_pvs_studio
+    COMMAND CXX=${CLANG_TOOL} ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug
+        -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
+        -DJSON_BuildTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_pvs_studio
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_pvs_studio && ${PVS_STUDIO_ANALYZER_TOOL} analyze -j 10
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_pvs_studio && ${PLOG_CONVERTER_TOOL} -a'GA:1,2;64:1;CS' -t fullhtml PVS-Studio.log -o pvs
+    COMMENT "Check code with PVS Studio"
+)
+
+###############################################################################
+# Check code with Infer <https://fbinfer.com> static analyzer.
+###############################################################################
+
+add_custom_target(ci_infer
+    COMMAND mkdir -p ${PROJECT_BINARY_DIR}/build_infer
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_infer && ${INFER_TOOL} compile -- ${CMAKE_COMMAND} -DCMAKE_BUILD_TYPE=Debug ${PROJECT_SOURCE_DIR} -DJSON_BuildTests=ON -DJSON_MultipleHeaders=ON
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_infer && ${INFER_TOOL} run -- make
+    COMMENT "Check code with Infer"
+)
+
+###############################################################################
+# Run test suite with previously downloaded test data.
+###############################################################################
+
+add_custom_target(ci_offline_testdata
+    COMMAND mkdir -p ${PROJECT_BINARY_DIR}/build_offline_testdata/test_data
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_offline_testdata/test_data && ${GIT_TOOL} clone -c advice.detachedHead=false --branch v3.0.0 https://github.com/nlohmann/json_test_data.git --quiet --depth 1
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON -DJSON_FastTests=ON -DJSON_TestDataDirectory=${PROJECT_BINARY_DIR}/build_offline_testdata/test_data/json_test_data
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_offline_testdata
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_offline_testdata
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_offline_testdata && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Check code with previously downloaded test data"
+)
+
+###############################################################################
+# Run test suite when project was not checked out from Git
+###############################################################################
+
+add_custom_target(ci_non_git_tests
+    COMMAND mkdir -p ${PROJECT_BINARY_DIR}/build_non_git_tests/sources
+    COMMAND cd ${PROJECT_SOURCE_DIR} && for FILE in `${GIT_TOOL} ls-tree --name-only HEAD`\; do cp -r $$FILE ${PROJECT_BINARY_DIR}/build_non_git_tests/sources \; done
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON -DJSON_FastTests=ON
+        -S${PROJECT_BINARY_DIR}/build_non_git_tests/sources -B${PROJECT_BINARY_DIR}/build_non_git_tests
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_non_git_tests
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_non_git_tests && ${CMAKE_CTEST_COMMAND} --parallel ${N} -LE git_required --output-on-failure
+    COMMENT "Check code when project was not checked out from Git"
+)
+
+###############################################################################
+# Run test suite and exclude tests that change installed files
+###############################################################################
+
+add_custom_target(ci_reproducible_tests
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DJSON_BuildTests=ON -DJSON_FastTests=ON
+        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_reproducible_tests
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_reproducible_tests
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_reproducible_tests && ${CMAKE_CTEST_COMMAND} --parallel ${N} -LE not_reproducible --output-on-failure
+    COMMENT "Check code and exclude tests that change installed files"
+)
+
+###############################################################################
+# Check if every header in the include folder includes sufficient headers to
+# be compiled individually.
+###############################################################################
+
+set(iwyu_path_and_options ${IWYU_TOOL} -Xiwyu --max_line_length=300)
+
+foreach(SRC_FILE ${SRC_FILES})
+    # get relative path of the header file
+    file(RELATIVE_PATH RELATIVE_SRC_FILE "${PROJECT_SOURCE_DIR}/include/nlohmann" "${SRC_FILE}")
+    # replace slashes and strip suffix
+    string(REPLACE "/" "_" RELATIVE_SRC_FILE "${RELATIVE_SRC_FILE}")
+    string(REPLACE ".hpp" "" RELATIVE_SRC_FILE "${RELATIVE_SRC_FILE}")
+    # create code file
+    file(WRITE "${PROJECT_BINARY_DIR}/src_single/${RELATIVE_SRC_FILE}.cpp" "#include \"${SRC_FILE}\" // IWYU pragma: keep\n\nint main()\n{}\n")
+    # create executable
+    add_executable(single_${RELATIVE_SRC_FILE} EXCLUDE_FROM_ALL ${PROJECT_BINARY_DIR}/src_single/${RELATIVE_SRC_FILE}.cpp)
+    target_include_directories(single_${RELATIVE_SRC_FILE} PRIVATE ${PROJECT_SOURCE_DIR}/include)
+    target_compile_features(single_${RELATIVE_SRC_FILE} PRIVATE cxx_std_11)
+    set_property(TARGET single_${RELATIVE_SRC_FILE} PROPERTY CXX_INCLUDE_WHAT_YOU_USE "${iwyu_path_and_options}")
+    # remember binary for ci_single_binaries target
+    list(APPEND single_binaries single_${RELATIVE_SRC_FILE})
+endforeach()
+
+add_custom_target(ci_single_binaries
+    DEPENDS ${single_binaries}
+    COMMENT "Check if headers are self-contained"
+)
+
+###############################################################################
+# Benchmarks
+###############################################################################
+
+add_custom_target(ci_benchmarks
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Release -GNinja
+        -S${PROJECT_SOURCE_DIR}/benchmarks -B${PROJECT_BINARY_DIR}/build_benchmarks
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_benchmarks --target json_benchmarks
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_benchmarks && ./json_benchmarks
+    COMMENT "Run benchmarks"
+)
+
+###############################################################################
+# CMake flags
+###############################################################################
+
+if (APPLE)
+    set(CMAKE_310_BINARY ${PROJECT_BINARY_DIR}/cmake-3.1.0-Darwin64/CMake.app/Contents/bin/cmake)
+    add_custom_command(
+        OUTPUT ${CMAKE_310_BINARY}
+        COMMAND wget https://github.com/Kitware/CMake/releases/download/v3.1.0/cmake-3.1.0-Darwin64.tar.gz
+        COMMAND tar xfz cmake-3.1.0-Darwin64.tar.gz
+        COMMAND rm cmake-3.1.0-Darwin64.tar.gz
+        WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
+        COMMENT "Download CMake 3.1.0"
+    )
+else()
+    set(CMAKE_310_BINARY ${PROJECT_BINARY_DIR}/cmake-3.1.0-Linux-x86_64/bin/cmake)
+    add_custom_command(
+        OUTPUT ${CMAKE_310_BINARY}
+        COMMAND wget https://github.com/Kitware/CMake/releases/download/v3.1.0/cmake-3.1.0-Linux-x86_64.tar.gz
+        COMMAND tar xfz cmake-3.1.0-Linux-x86_64.tar.gz
+        COMMAND rm cmake-3.1.0-Linux-x86_64.tar.gz
+        WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
+        COMMENT "Download CMake 3.1.0"
+    )
+endif()
+
+set(JSON_CMAKE_FLAGS "JSON_BuildTests;JSON_Install;JSON_MultipleHeaders;JSON_ImplicitConversions;JSON_Valgrind;JSON_Diagnostics;JSON_SystemInclude")
+
+foreach(JSON_CMAKE_FLAG ${JSON_CMAKE_FLAGS})
+    string(TOLOWER "ci_cmake_flag_${JSON_CMAKE_FLAG}" JSON_CMAKE_FLAG_TARGET)
+    add_custom_target("${JSON_CMAKE_FLAG_TARGET}"
+        COMMENT "Check CMake flag ${JSON_CMAKE_FLAG} (CMake ${CMAKE_VERSION})"
+        COMMAND ${CMAKE_COMMAND}
+            -Werror=dev
+            -D${JSON_CMAKE_FLAG}=ON
+            -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_${JSON_CMAKE_FLAG_TARGET}
+    )
+    add_custom_target("${JSON_CMAKE_FLAG_TARGET}_31"
+        COMMENT "Check CMake flag ${JSON_CMAKE_FLAG} (CMake 3.1)"
+        COMMAND mkdir ${PROJECT_BINARY_DIR}/build_${JSON_CMAKE_FLAG_TARGET}_31
+        COMMAND cd ${PROJECT_BINARY_DIR}/build_${JSON_CMAKE_FLAG_TARGET}_31 && ${CMAKE_310_BINARY}
+            -Werror=dev ${PROJECT_SOURCE_DIR}
+            -D${JSON_CMAKE_FLAG}=ON
+            -DCMAKE_CXX_COMPILE_FEATURES="cxx_range_for" -DCMAKE_CXX_FLAGS="-std=gnu++11"
+        DEPENDS ${CMAKE_310_BINARY}
+    )
+    list(APPEND JSON_CMAKE_FLAG_TARGETS ${JSON_CMAKE_FLAG_TARGET} ${JSON_CMAKE_FLAG_TARGET}_31)
+    list(APPEND JSON_CMAKE_FLAG_BUILD_DIRS ${PROJECT_BINARY_DIR}/build_${JSON_CMAKE_FLAG_TARGET} ${PROJECT_BINARY_DIR}/build_${JSON_CMAKE_FLAG_TARGET}_31)
+endforeach()
+
+add_custom_target(ci_cmake_flags
+    DEPENDS ${JSON_CMAKE_FLAG_TARGETS}
+    COMMENT "Check CMake flags"
+)
+
+###############################################################################
+# Use more installed compilers.
+###############################################################################
+
+foreach(COMPILER g++-4.8 g++-4.9 g++-5 g++-7 g++-8 g++-9 g++-10 clang++-3.5 clang++-3.6 clang++-3.7 clang++-3.8 clang++-3.9 clang++-4.0 clang++-5.0 clang++-6.0 clang++-7 clang++-8 clang++-9 clang++-10 clang++-11)
+    find_program(COMPILER_TOOL NAMES ${COMPILER})
+    if (COMPILER_TOOL)
+        add_custom_target(ci_test_compiler_${COMPILER}
+            COMMAND CXX=${COMPILER} ${CMAKE_COMMAND}
+                -DCMAKE_BUILD_TYPE=Debug -GNinja
+                -DJSON_BuildTests=ON -DJSON_FastTests=ON
+                -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_compiler_${COMPILER}
+            COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_compiler_${COMPILER}
+            COMMAND cd ${PROJECT_BINARY_DIR}/build_compiler_${COMPILER} && ${CMAKE_CTEST_COMMAND} --parallel ${N} --exclude-regex "test-unicode" --output-on-failure
+            COMMENT "Compile and test with ${COMPILER}"
+        )
+    endif()
+    unset(COMPILER_TOOL CACHE)
+endforeach()
+
+###############################################################################
+# Clean up all generated files.
+###############################################################################
+
+add_custom_target(ci_clean
+    COMMAND rm -fr ${PROJECT_BINARY_DIR}/build_* cmake-3.1.0-Darwin64 ${JSON_CMAKE_FLAG_BUILD_DIRS} ${single_binaries}
+    COMMENT "Clean generated directories"
+)

cmake/config.cmake.in

@@ -0,0 +1,15 @@
+include(FindPackageHandleStandardArgs)
+set(${CMAKE_FIND_PACKAGE_NAME}_CONFIG ${CMAKE_CURRENT_LIST_FILE})
+find_package_handle_standard_args(@PROJECT_NAME@ CONFIG_MODE)
+
+if(NOT TARGET @PROJECT_NAME@::@NLOHMANN_JSON_TARGET_NAME@)
+    include("${CMAKE_CURRENT_LIST_DIR}/@NLOHMANN_JSON_TARGETS_EXPORT_NAME@.cmake")
+    if((NOT TARGET @NLOHMANN_JSON_TARGET_NAME@) AND
+       (NOT @PROJECT_NAME@_FIND_VERSION OR
+        @PROJECT_NAME@_FIND_VERSION VERSION_LESS 3.2.0))
+        add_library(@NLOHMANN_JSON_TARGET_NAME@ INTERFACE IMPORTED)
+        set_target_properties(@NLOHMANN_JSON_TARGET_NAME@ PROPERTIES
+            INTERFACE_LINK_LIBRARIES @PROJECT_NAME@::@NLOHMANN_JSON_TARGET_NAME@
+        )
+    endif()
+endif()

cmake/download_test_data.cmake

@@ -0,0 +1,56 @@
+set(JSON_TEST_DATA_URL     https://github.com/nlohmann/json_test_data)
+set(JSON_TEST_DATA_VERSION 3.0.0)
+
+# if variable is set, use test data from given directory rather than downloading them
+if(JSON_TestDataDirectory)
+    message(STATUS "Using test data in ${JSON_TestDataDirectory}.")
+    add_custom_target(download_test_data)
+    file(WRITE ${CMAKE_BINARY_DIR}/include/test_data.hpp "#define TEST_DATA_DIRECTORY \"${JSON_TestDataDirectory}\"\n")
+else()
+    find_package(Git)
+    # target to download test data
+    add_custom_target(download_test_data
+        COMMAND test -d json_test_data || ${GIT_EXECUTABLE} clone -c advice.detachedHead=false --branch v${JSON_TEST_DATA_VERSION} ${JSON_TEST_DATA_URL}.git --quiet --depth 1
+        COMMENT "Downloading test data from ${JSON_TEST_DATA_URL} (v${JSON_TEST_DATA_VERSION})"
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+    )
+    # create a header with the path to the downloaded test data
+    file(WRITE ${CMAKE_BINARY_DIR}/include/test_data.hpp "#define TEST_DATA_DIRECTORY \"${CMAKE_BINARY_DIR}/json_test_data\"\n")
+endif()
+
+# determine the operating system (for debug and support purposes)
+find_program(UNAME_COMMAND uname)
+find_program(VER_COMMAND ver)
+find_program(LSB_RELEASE_COMMAND lsb_release)
+find_program(SW_VERS_COMMAND sw_vers)
+set(OS_VERSION_STRINGS "${CMAKE_SYSTEM}")
+if (VER_COMMAND)
+    execute_process(COMMAND ${VER_COMMAND} OUTPUT_VARIABLE VER_COMMAND_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE)
+    set(OS_VERSION_STRINGS "${OS_VERSION_STRINGS}; ${VER_COMMAND_RESULT}")
+endif()
+if (SW_VERS_COMMAND)
+    execute_process(COMMAND ${SW_VERS_COMMAND} OUTPUT_VARIABLE SW_VERS_COMMAND_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
+    string(REGEX REPLACE "[ ]*\n" "; " SW_VERS_COMMAND_RESULT "${SW_VERS_COMMAND_RESULT}")
+    set(OS_VERSION_STRINGS "${OS_VERSION_STRINGS}; ${SW_VERS_COMMAND_RESULT}")
+endif()
+if (LSB_RELEASE_COMMAND)
+    execute_process(COMMAND ${LSB_RELEASE_COMMAND} -a OUTPUT_VARIABLE LSB_RELEASE_COMMAND_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
+    string(REGEX REPLACE "[ ]*\n" "; " LSB_RELEASE_COMMAND_RESULT "${LSB_RELEASE_COMMAND_RESULT}")
+    set(OS_VERSION_STRINGS "${OS_VERSION_STRINGS}; ${LSB_RELEASE_COMMAND_RESULT}")
+endif()
+if (UNAME_COMMAND)
+    execute_process(COMMAND ${UNAME_COMMAND} -a OUTPUT_VARIABLE UNAME_COMMAND_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
+    set(OS_VERSION_STRINGS "${OS_VERSION_STRINGS}; ${UNAME_COMMAND_RESULT}")
+endif()
+
+message(STATUS "Operating system: ${OS_VERSION_STRINGS}")
+
+# determine the compiler (for debug and support purposes)
+if (MSVC)
+    execute_process(COMMAND ${CMAKE_CXX_COMPILER} OUTPUT_VARIABLE CXX_VERSION_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_VARIABLE CXX_VERSION_RESULT ERROR_STRIP_TRAILING_WHITESPACE)
+    set(CXX_VERSION_RESULT "${CXX_VERSION_RESULT}; MSVC_VERSION=${MSVC_VERSION}; MSVC_TOOLSET_VERSION=${MSVC_TOOLSET_VERSION}")
+else()
+    execute_process(COMMAND ${CMAKE_CXX_COMPILER} --version OUTPUT_VARIABLE CXX_VERSION_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE)
+endif()
+string(REGEX REPLACE "[ ]*\n" "; " CXX_VERSION_RESULT "${CXX_VERSION_RESULT}")
+message(STATUS "Compiler: ${CXX_VERSION_RESULT}")

cmake/nlohmann_jsonConfigVersion.cmake.in

@@ -0,0 +1,20 @@
+# This is essentially cmake's BasicConfigVersion-SameMajorVersion.cmake.in but
+# without the 32/64-bit check.  Since json is a header-only library, it doesn't
+# matter if it was built on a different platform than what it is used on (see
+# https://github.com/nlohmann/json/issues/1697).
+set(PACKAGE_VERSION "@PROJECT_VERSION@")
+
+if(PACKAGE_VERSION VERSION_LESS PACKAGE_FIND_VERSION)
+  set(PACKAGE_VERSION_COMPATIBLE FALSE)
+else()
+
+  if(PACKAGE_FIND_VERSION_MAJOR STREQUAL "@PROJECT_VERSION_MAJOR@")
+    set(PACKAGE_VERSION_COMPATIBLE TRUE)
+  else()
+    set(PACKAGE_VERSION_COMPATIBLE FALSE)
+  endif()
+
+  if(PACKAGE_FIND_VERSION STREQUAL PACKAGE_VERSION)
+      set(PACKAGE_VERSION_EXACT TRUE)
+  endif()
+endif()

cmake/pkg-config.pc.in

@@ -0,0 +1,4 @@
+Name: ${PROJECT_NAME}
+Description: JSON for Modern C++
+Version: ${PROJECT_VERSION}
+Cflags: -I${CMAKE_INSTALL_FULL_INCLUDEDIR}

doc/Doxyfile

@@ -0,0 +1,335 @@
+# Doxyfile 1.9.1
+
+#---------------------------------------------------------------------------
+# Project related configuration options
+#---------------------------------------------------------------------------
+DOXYFILE_ENCODING      = UTF-8
+PROJECT_NAME           = "JSON for Modern C++"
+PROJECT_NUMBER         = 3.10.0
+PROJECT_BRIEF          =
+PROJECT_LOGO           =
+OUTPUT_DIRECTORY       = .
+CREATE_SUBDIRS         = NO
+ALLOW_UNICODE_NAMES    = NO
+OUTPUT_LANGUAGE        = English
+OUTPUT_TEXT_DIRECTION  = None
+BRIEF_MEMBER_DESC      = YES
+REPEAT_BRIEF           = NO
+ABBREVIATE_BRIEF       =
+ALWAYS_DETAILED_SEC    = YES
+INLINE_INHERITED_MEMB  = NO
+FULL_PATH_NAMES        = YES
+STRIP_FROM_PATH        =
+STRIP_FROM_INC_PATH    =
+SHORT_NAMES            = NO
+JAVADOC_AUTOBRIEF      = NO
+JAVADOC_BANNER         = NO
+QT_AUTOBRIEF           = NO
+MULTILINE_CPP_IS_BRIEF = NO
+PYTHON_DOCSTRING       = YES
+INHERIT_DOCS           = YES
+SEPARATE_MEMBER_PAGES  = YES
+TAB_SIZE               = 4
+ALIASES                = "complexity=@par Complexity^^" \
+                         "liveexample{2}=@par Example^^ \1 ^^ @includelineno \2.cpp \n Output (play with this example @htmlinclude \2.link):^^ @verbinclude \2.output ^^ The <a href= https://github.com/nlohmann/json/blob/develop/doc/examples/\2.cpp>example code</a> above can be translated with @verbatim g++ -std=c++11 -Isingle_include doc/examples/\2.cpp -o \2 @endverbatim" \
+                         "requirement=@par Requirements^^" \
+                         "exceptionsafety=@par Exception safety^^" \
+                         "iterators=@par Iterator validity^^"
+OPTIMIZE_OUTPUT_FOR_C  = NO
+OPTIMIZE_OUTPUT_JAVA   = NO
+OPTIMIZE_FOR_FORTRAN   = NO
+OPTIMIZE_OUTPUT_VHDL   = NO
+OPTIMIZE_OUTPUT_SLICE  = NO
+EXTENSION_MAPPING      =
+MARKDOWN_SUPPORT       = YES
+TOC_INCLUDE_HEADINGS   = 0
+AUTOLINK_SUPPORT       = NO
+BUILTIN_STL_SUPPORT    = YES
+CPP_CLI_SUPPORT        = NO
+SIP_SUPPORT            = NO
+IDL_PROPERTY_SUPPORT   = YES
+DISTRIBUTE_GROUP_DOC   = NO
+GROUP_NESTED_COMPOUNDS = NO
+SUBGROUPING            = YES
+INLINE_GROUPED_CLASSES = NO
+INLINE_SIMPLE_STRUCTS  = NO
+TYPEDEF_HIDES_STRUCT   = NO
+LOOKUP_CACHE_SIZE      = 0
+NUM_PROC_THREADS       = 1
+#---------------------------------------------------------------------------
+# Build related configuration options
+#---------------------------------------------------------------------------
+EXTRACT_ALL            = YES
+EXTRACT_PRIVATE        = NO
+EXTRACT_PRIV_VIRTUAL   = NO
+EXTRACT_PACKAGE        = YES
+EXTRACT_STATIC         = YES
+EXTRACT_LOCAL_CLASSES  = YES
+EXTRACT_LOCAL_METHODS  = YES
+EXTRACT_ANON_NSPACES   = YES
+RESOLVE_UNNAMED_PARAMS = YES
+HIDE_UNDOC_MEMBERS     = NO
+HIDE_UNDOC_CLASSES     = NO
+HIDE_FRIEND_COMPOUNDS  = NO
+HIDE_IN_BODY_DOCS      = NO
+INTERNAL_DOCS          = NO
+CASE_SENSE_NAMES       = NO
+HIDE_SCOPE_NAMES       = NO
+HIDE_COMPOUND_REFERENCE= NO
+SHOW_INCLUDE_FILES     = YES
+SHOW_GROUPED_MEMB_INC  = NO
+FORCE_LOCAL_INCLUDES   = NO
+INLINE_INFO            = YES
+SORT_MEMBER_DOCS       = YES
+SORT_BRIEF_DOCS        = YES
+SORT_MEMBERS_CTORS_1ST = YES
+SORT_GROUP_NAMES       = NO
+SORT_BY_SCOPE_NAME     = NO
+STRICT_PROTO_MATCHING  = NO
+GENERATE_TODOLIST      = YES
+GENERATE_TESTLIST      = YES
+GENERATE_BUGLIST       = YES
+GENERATE_DEPRECATEDLIST= YES
+ENABLED_SECTIONS       =
+MAX_INITIALIZER_LINES  = 30
+SHOW_USED_FILES        = NO
+SHOW_FILES             = NO
+SHOW_NAMESPACES        = NO
+FILE_VERSION_FILTER    =
+LAYOUT_FILE            =
+CITE_BIB_FILES         =
+#---------------------------------------------------------------------------
+# Configuration options related to warning and progress messages
+#---------------------------------------------------------------------------
+QUIET                  = YES
+WARNINGS               = YES
+WARN_IF_UNDOCUMENTED   = YES
+WARN_IF_DOC_ERROR      = YES
+WARN_NO_PARAMDOC       = YES
+WARN_AS_ERROR          = NO
+WARN_FORMAT            = "$file:$line: $text"
+WARN_LOGFILE           =
+#---------------------------------------------------------------------------
+# Configuration options related to the input files
+#---------------------------------------------------------------------------
+INPUT                  = ../single_include/nlohmann/json.hpp \
+                         index.md
+INPUT_ENCODING         = UTF-8
+FILE_PATTERNS          =
+RECURSIVE              = NO
+EXCLUDE                =
+EXCLUDE_SYMLINKS       = NO
+EXCLUDE_PATTERNS       =
+EXCLUDE_SYMBOLS        = nlohmann::detail
+EXAMPLE_PATH           = examples
+EXAMPLE_PATTERNS       =
+EXAMPLE_RECURSIVE      = NO
+IMAGE_PATH             = images
+INPUT_FILTER           =
+FILTER_PATTERNS        =
+FILTER_SOURCE_FILES    = NO
+FILTER_SOURCE_PATTERNS =
+USE_MDFILE_AS_MAINPAGE = index.md
+#---------------------------------------------------------------------------
+# Configuration options related to source browsing
+#---------------------------------------------------------------------------
+SOURCE_BROWSER         = YES
+INLINE_SOURCES         = NO
+STRIP_CODE_COMMENTS    = YES
+REFERENCED_BY_RELATION = NO
+REFERENCES_RELATION    = NO
+REFERENCES_LINK_SOURCE = NO
+SOURCE_TOOLTIPS        = YES
+USE_HTAGS              = NO
+VERBATIM_HEADERS       = NO
+#---------------------------------------------------------------------------
+# Configuration options related to the alphabetical class index
+#---------------------------------------------------------------------------
+ALPHABETICAL_INDEX     = YES
+IGNORE_PREFIX          =
+#---------------------------------------------------------------------------
+# Configuration options related to the HTML output
+#---------------------------------------------------------------------------
+GENERATE_HTML          = YES
+HTML_OUTPUT            = html
+HTML_FILE_EXTENSION    = .html
+HTML_HEADER            =
+HTML_FOOTER            =
+HTML_STYLESHEET        =
+HTML_EXTRA_STYLESHEET  = css/mylayout.css
+HTML_EXTRA_FILES       =
+HTML_COLORSTYLE_HUE    = 220
+HTML_COLORSTYLE_SAT    = 100
+HTML_COLORSTYLE_GAMMA  = 80
+HTML_TIMESTAMP         = YES
+HTML_DYNAMIC_MENUS     = YES
+HTML_DYNAMIC_SECTIONS  = YES
+HTML_INDEX_NUM_ENTRIES = 100
+GENERATE_DOCSET        = YES
+DOCSET_FEEDNAME        = "Doxygen generated docs"
+DOCSET_BUNDLE_ID       = me.nlohmann.json
+DOCSET_PUBLISHER_ID    = me.nlohmann
+DOCSET_PUBLISHER_NAME  = NielsLohmann
+GENERATE_HTMLHELP      = NO
+CHM_FILE               =
+HHC_LOCATION           =
+GENERATE_CHI           = NO
+CHM_INDEX_ENCODING     =
+BINARY_TOC             = NO
+TOC_EXPAND             = NO
+GENERATE_QHP           = NO
+QCH_FILE               =
+QHP_NAMESPACE          = org.doxygen.Project
+QHP_VIRTUAL_FOLDER     = doc
+QHP_CUST_FILTER_NAME   =
+QHP_CUST_FILTER_ATTRS  =
+QHP_SECT_FILTER_ATTRS  =
+QHG_LOCATION           =
+GENERATE_ECLIPSEHELP   = NO
+ECLIPSE_DOC_ID         = org.doxygen.Project
+DISABLE_INDEX          = NO
+GENERATE_TREEVIEW      = NO
+ENUM_VALUES_PER_LINE   = 4
+TREEVIEW_WIDTH         = 250
+EXT_LINKS_IN_WINDOW    = NO
+HTML_FORMULA_FORMAT    = png
+FORMULA_FONTSIZE       = 10
+FORMULA_TRANSPARENT    = YES
+FORMULA_MACROFILE      =
+USE_MATHJAX            = NO
+MATHJAX_FORMAT         = HTML-CSS
+MATHJAX_RELPATH        = http://cdn.mathjax.org/mathjax/latest
+MATHJAX_EXTENSIONS     =
+MATHJAX_CODEFILE       =
+SEARCHENGINE           = YES
+SERVER_BASED_SEARCH    = NO
+EXTERNAL_SEARCH        = NO
+SEARCHENGINE_URL       =
+SEARCHDATA_FILE        = searchdata.xml
+EXTERNAL_SEARCH_ID     =
+EXTRA_SEARCH_MAPPINGS  =
+#---------------------------------------------------------------------------
+# Configuration options related to the LaTeX output
+#---------------------------------------------------------------------------
+GENERATE_LATEX         = NO
+LATEX_OUTPUT           = latex
+LATEX_CMD_NAME         = latex
+MAKEINDEX_CMD_NAME     = makeindex
+LATEX_MAKEINDEX_CMD    = \makeindex
+COMPACT_LATEX          = NO
+PAPER_TYPE             = a4
+EXTRA_PACKAGES         =
+LATEX_HEADER           =
+LATEX_FOOTER           =
+LATEX_EXTRA_STYLESHEET =
+LATEX_EXTRA_FILES      =
+PDF_HYPERLINKS         = YES
+USE_PDFLATEX           = YES
+LATEX_BATCHMODE        = NO
+LATEX_HIDE_INDICES     = NO
+LATEX_SOURCE_CODE      = NO
+LATEX_BIB_STYLE        = plain
+LATEX_TIMESTAMP        = NO
+LATEX_EMOJI_DIRECTORY  =
+#---------------------------------------------------------------------------
+# Configuration options related to the RTF output
+#---------------------------------------------------------------------------
+GENERATE_RTF           = NO
+RTF_OUTPUT             = rtf
+COMPACT_RTF            = NO
+RTF_HYPERLINKS         = NO
+RTF_STYLESHEET_FILE    =
+RTF_EXTENSIONS_FILE    =
+RTF_SOURCE_CODE        = NO
+#---------------------------------------------------------------------------
+# Configuration options related to the man page output
+#---------------------------------------------------------------------------
+GENERATE_MAN           = NO
+MAN_OUTPUT             = man
+MAN_EXTENSION          = .3
+MAN_SUBDIR             =
+MAN_LINKS              = NO
+#---------------------------------------------------------------------------
+# Configuration options related to the XML output
+#---------------------------------------------------------------------------
+GENERATE_XML           = YES
+XML_OUTPUT             = xml
+XML_PROGRAMLISTING     = YES
+XML_NS_MEMB_FILE_SCOPE = NO
+#---------------------------------------------------------------------------
+# Configuration options related to the DOCBOOK output
+#---------------------------------------------------------------------------
+GENERATE_DOCBOOK       = NO
+DOCBOOK_OUTPUT         = docbook
+DOCBOOK_PROGRAMLISTING = NO
+#---------------------------------------------------------------------------
+# Configuration options for the AutoGen Definitions output
+#---------------------------------------------------------------------------
+GENERATE_AUTOGEN_DEF   = NO
+#---------------------------------------------------------------------------
+# Configuration options related to the Perl module output
+#---------------------------------------------------------------------------
+GENERATE_PERLMOD       = NO
+PERLMOD_LATEX          = NO
+PERLMOD_PRETTY         = YES
+PERLMOD_MAKEVAR_PREFIX =
+#---------------------------------------------------------------------------
+# Configuration options related to the preprocessor
+#---------------------------------------------------------------------------
+ENABLE_PREPROCESSING   = YES
+MACRO_EXPANSION        = NO
+EXPAND_ONLY_PREDEF     = NO
+SEARCH_INCLUDES        = YES
+INCLUDE_PATH           =
+INCLUDE_FILE_PATTERNS  =
+PREDEFINED             =
+EXPAND_AS_DEFINED      =
+SKIP_FUNCTION_MACROS   = YES
+#---------------------------------------------------------------------------
+# Configuration options related to external references
+#---------------------------------------------------------------------------
+TAGFILES               =
+GENERATE_TAGFILE       = html/nlohmann_json.tag
+ALLEXTERNALS           = NO
+EXTERNAL_GROUPS        = YES
+EXTERNAL_PAGES         = YES
+#---------------------------------------------------------------------------
+# Configuration options related to the dot tool
+#---------------------------------------------------------------------------
+CLASS_DIAGRAMS         = NO
+DIA_PATH               =
+HIDE_UNDOC_RELATIONS   = YES
+HAVE_DOT               = YES
+DOT_NUM_THREADS        = 0
+DOT_FONTNAME           = Helvetica
+DOT_FONTSIZE           = 10
+DOT_FONTPATH           =
+CLASS_GRAPH            = NO
+COLLABORATION_GRAPH    = NO
+GROUP_GRAPHS           = YES
+UML_LOOK               = YES
+UML_LIMIT_NUM_FIELDS   = 10
+DOT_UML_DETAILS        = NO
+DOT_WRAP_THRESHOLD     = 17
+TEMPLATE_RELATIONS     = NO
+INCLUDE_GRAPH          = NO
+INCLUDED_BY_GRAPH      = NO
+CALL_GRAPH             = NO
+CALLER_GRAPH           = NO
+GRAPHICAL_HIERARCHY    = NO
+DIRECTORY_GRAPH        = NO
+DOT_IMAGE_FORMAT       = svg
+INTERACTIVE_SVG        = YES
+DOT_PATH               =
+DOTFILE_DIRS           =
+MSCFILE_DIRS           =
+DIAFILE_DIRS           =
+PLANTUML_JAR_PATH      =
+PLANTUML_CFG_FILE      =
+PLANTUML_INCLUDE_PATH  =
+DOT_GRAPH_MAX_NODES    = 50
+MAX_DOT_GRAPH_DEPTH    = 0
+DOT_TRANSPARENT        = NO
+DOT_MULTI_TARGETS      = NO
+GENERATE_LEGEND        = YES
+DOT_CLEANUP            = YES

doc/Makefile

@@ -0,0 +1,92 @@
+SRCDIR = ../single_include
+SED:=$(shell command -v gsed || which sed)
+
+all: doxygen
+
+
+##########################################################################
+# example files
+##########################################################################
+
+# where are the example cpp files
+EXAMPLES = $(wildcard examples/*.cpp)
+
+# create output from a stand-alone example file
+%.output: %.cpp
+	make $(<:.cpp=) CPPFLAGS="-I $(SRCDIR)" CXXFLAGS="-std=c++11"
+	./$(<:.cpp=) > $@
+	rm $(<:.cpp=)
+
+# compare created output with current output of the example files
+%.test: %.cpp
+	make $(<:.cpp=) CPPFLAGS="-I $(SRCDIR)" CXXFLAGS="-std=c++11"
+	./$(<:.cpp=) > $@
+	diff $@ $(<:.cpp=.output)
+	rm $(<:.cpp=) $@
+
+# create links to try the code online
+%.link: %.cpp
+	rm -fr tmp
+	mkdir tmp
+	cp -r $(SRCDIR)/nlohmann tmp
+	python2 scripts/send_to_wandbox.py tmp $< > $@.tmp
+	/bin/echo -n "<a target=\"_blank\" href=\"`cat $@.tmp`\"><b>online</b></a>" > $@
+	rm -fr tmp $@.tmp
+
+# create output from all stand-alone example files
+create_output: $(EXAMPLES:.cpp=.output)
+
+create_links: $(EXAMPLES:.cpp=.link)
+
+# check output of all stand-alone example files
+check_output: $(EXAMPLES:.cpp=.test)
+
+
+clean:
+	rm -fr me.nlohmann.json.docset html xml $(EXAMPLES:.cpp=)
+	$(MAKE) clean -C docset
+	$(MAKE) clean -C mkdocs
+
+
+##########################################################################
+# Doxygen HTML documentation
+##########################################################################
+
+# create Doxygen documentation
+doxygen: create_output create_links
+	doxygen
+	$(SED) -i 's@&lt; ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberFloatType, AllocatorType, JSONSerializer &gt;@@g' html/*.html
+	$(SED) -i 's@&lt;&#160;ObjectType,&#160;ArrayType,&#160;StringType,&#160;BooleanType,&#160;NumberIntegerType,&#160;NumberFloatType,&#160;AllocatorType&#160;JSONSerializer&#160;&gt;@@g' html/*.html
+	$(SED) -i 's@&lt; ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer &gt;@@g' html/*.html
+	$(SED) -i 's@< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer >@@g' html/*.html
+	$(SED) -i 's@&lt;&#160;ObjectType,&#160;ArrayType,&#160;StringType,&#160;BooleanType,&#160;NumberIntegerType,&#160;NumberUnsignedType,&#160;NumberFloatType,&#160;AllocatorType&#160;JSONSerializer&#160;&gt;@@g' html/*.html
+	$(SED) -i 's@template&lt;template&lt; typename U, typename V, typename... Args &gt; class ObjectType = std::map, template&lt; typename U, typename... Args &gt; class ArrayType = std::vector, class StringType = std::string, class BooleanType = bool, class NumberIntegerType = std::int64_t, class NumberUnsignedType = std::uint64_t, class NumberFloatType = double, template&lt; typename U &gt; class AllocatorType = std::allocator, template&lt; typename T, typename SFINAE=void &gt; class JSONSerializer = adl_serializer&gt;@@g' html/*.html
+	$(SED) -i 's@&lt; ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer &gt;@@g' html/*.html
+	$(SED) -i 's@&lt;&#160;ObjectType,&#160;ArrayType,&#160;StringType,&#160;BooleanType,&#160;NumberIntegerType,&#160;NumberUnsignedType,&#160;NumberFloatType,&#160;AllocatorType,&#160;JSONSerializer&#160;&gt;@@g' html/*.html
+	$(SED) -i 's@JSON_HEDLEY_RETURNS_NON_NULL@@g' html/*.html
+	$(SED) -i 's@JSON_HEDLEY_WARN_UNUSED_RESULT@@g' html/*.html
+
+upload: clean doxygen check_output
+	scripts/git-update-ghpages nlohmann/json html
+	rm -fr html
+	open http://nlohmann.github.io/json/
+
+
+##########################################################################
+# docset
+##########################################################################
+
+# create docset for Dash
+docset: create_output
+	cp Doxyfile Doxyfile_docset
+	$(SED) -i 's/DISABLE_INDEX          = NO/DISABLE_INDEX          = YES/' Doxyfile_docset
+	$(SED) -i 's/SEARCHENGINE           = YES/SEARCHENGINE           = NO/' Doxyfile_docset
+	$(SED) -i 's@HTML_EXTRA_STYLESHEET  = css/mylayout.css@HTML_EXTRA_STYLESHEET  = css/mylayout_docset.css@' Doxyfile_docset
+	rm -fr html *.docset
+	doxygen Doxyfile_docset
+	$(SED) -i 's@&lt; ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberFloatType, AllocatorType &gt;@@g' html/*.html
+	$(SED) -i 's@&lt;&#160;ObjectType,&#160;ArrayType,&#160;StringType,&#160;BooleanType,&#160;NumberIntegerType,&#160;NumberFloatType,&#160;AllocatorType&#160;&gt;@@g' html/*.html
+	make -C html
+	mv html/*.docset .
+	$(SED) -i 's@<string>doxygen</string>@<string>json</string>@' me.nlohmann.json.docset/Contents/Info.plist
+	rm -fr Doxyfile_docset html

doc/css/mylayout.css

@@ -0,0 +1,26 @@
+/* hide lengthy template information */
+.memtemplate, .memTemplParams {
+    display: none;
+}
+
+/* allow compiler information to wrap */
+/* https://css-tricks.com/snippets/css/make-pre-text-wrap/ */
+pre.fragment {
+    white-space: pre-wrap;       /* css-3 */
+    white-space: -moz-pre-wrap;  /* Mozilla, since 1999 */
+    white-space: -pre-wrap;      /* Opera 4-6 */
+    white-space: -o-pre-wrap;    /* Opera 7 */
+    word-wrap: break-word;       /* Internet Explorer 5.5+ */
+}
+
+td.paramname {
+    vertical-align: top;
+}
+
+.ok_green {
+    background-color: #89C35C;
+}
+
+.nok_throws {
+    background-color: #ffa500;
+}

doc/css/mylayout_docset.css

@@ -0,0 +1,27 @@
+.memtemplate {
+    display: none;
+}
+
+.memTemplParams {
+    display: none;
+}
+
+.navtab {
+    display: none;
+}
+
+#top, .footer {
+    display: none;
+}
+
+td.paramname {
+    vertical-align: top;
+}
+
+.ok_green {
+    background-color: #89C35C;
+}
+
+.nok_throws {
+    background-color: #ffa500;
+}

doc/docset/Info.plist

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleIdentifier</key>
+	<string>nlohmann_json</string>
+	<key>CFBundleName</key>
+	<string>JSON for Modern C++</string>
+	<key>DocSetPlatformFamily</key>
+	<string>json</string>
+	<key>isDashDocset</key>
+	<true/>
+    <key>dashIndexFilePath</key>
+    <string>index.html</string>
+    <key>DashDocSetFallbackURL</key>
+    <string>https://nlohmann.github.io/json/</string>
+    <key>isJavaScriptEnabled</key>
+    <true/>
+</dict>
+</plist>

doc/docset/Makefile

@@ -0,0 +1,21 @@
+nlohmann_json.docset: Info.plist docSet.sql
+	$(MAKE) clean
+	mkdir -p nlohmann_json.docset/Contents/Resources/Documents/
+	cp info.plist nlohmann_json.docset/Contents
+	# build and copy documentation
+	$(MAKE) build -C ../mkdocs
+	cp -r ../mkdocs/site/* nlohmann_json.docset/Contents/Resources/Documents
+	# patch CSS to hide navigation items
+	echo "\n\nheader, footer, navi, div.md-sidebar--primary, nav.md-tabs--active, a.md-content__button { display: none; }" >> nlohmann_json.docset/Contents/Resources/Documents/assets/stylesheets/main.b5d04df8.min.css
+	# fix spacing
+	echo "\n\ndiv.md-sidebar div.md-sidebar--secondary, div.md-main__inner { top: 0; margin-top: 0 }" >> nlohmann_json.docset/Contents/Resources/Documents/assets/stylesheets/main.b5d04df8.min.css
+	# remove "JSON for Modern C++" from page titles
+	find nlohmann_json.docset/Contents/Resources/Documents -type f -exec gsed -i 's| - JSON for Modern C++</title>|</title>|' {} +
+	# clean up
+	rm nlohmann_json.docset/Contents/Resources/Documents/hooks.py
+	rm nlohmann_json.docset/Contents/Resources/Documents/sitemap.*
+	# generate index
+	sqlite3 nlohmann_json.docset/Contents/Resources/docSet.dsidx < docSet.sql
+
+clean:
+	rm -fr nlohmann_json.docset

doc/docset/README.md

@@ -0,0 +1,13 @@
+# docset
+
+The folder contains the required files to create a [docset](https://kapeli.com/docsets) which can be used in
+documentation browsers like [Dash](https://kapeli.com/dash), [Velocity](https://velocity.silverlakesoftware.com), or
+[Zeal](https://zealdocs.org).
+
+The docset can be created with
+
+```sh
+make nlohmann_json.docset
+```
+
+The generated folder `nlohmann_json.docset` can then be opened in the documentation browser.

doc/docset/docSet.sql

@@ -0,0 +1,155 @@
+DROP TABLE IF EXISTS searchIndex;
+CREATE TABLE searchIndex(id INTEGER PRIMARY KEY, name TEXT, type TEXT, path TEXT);
+CREATE UNIQUE INDEX anchor ON searchIndex (name, type, path);
+
+-- API
+INSERT INTO searchIndex(name, type, path) VALUES ('accept', 'Function', 'api/basic_json/accept/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('adl_serializer', 'Class', 'api/adl_serializer/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('array', 'Function', 'api/basic_json/array/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('array_t', 'Type', 'api/basic_json/array_t/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('at', 'Method', 'api/basic_json/at/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('back', 'Method', 'api/basic_json/back/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('basic_json', 'Class', 'api/basic_json/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('basic_json', 'Constructor', 'api/basic_json/basic_json/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('begin', 'Method', 'api/basic_json/begin/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('binary', 'Function', 'api/basic_json/binary/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('binary_t', 'Type', 'api/basic_json/binary_t/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('boolean_t', 'Type', 'api/basic_json/boolean_t/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('cbegin', 'Method', 'api/basic_json/cbegin/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('cbor_tag_handler_t', 'Enum', 'api/basic_json/cbor_tag_handler_t/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('cend', 'Method', 'api/basic_json/cend/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('clear', 'Method', 'api/basic_json/clear/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('contains', 'Method', 'api/basic_json/contains/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('count', 'Method', 'api/basic_json/count/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('crbegin', 'Method', 'api/basic_json/crbegin/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('crend', 'Method', 'api/basic_json/crend/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('diff', 'Function', 'api/basic_json/diff/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('dump', 'Method', 'api/basic_json/dump/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('emplace', 'Method', 'api/basic_json/emplace/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('emplace_back', 'Method', 'api/basic_json/emplace_back/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('empty', 'Method', 'api/basic_json/empty/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('end', 'Method', 'api/basic_json/end/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('erase', 'Method', 'api/basic_json/erase/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('error_handler_t', 'Enum', 'api/basic_json/error_handler_t/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('exception', 'Class', 'api/basic_json/exception/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('find', 'Method', 'api/basic_json/find/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('flatten', 'Method', 'api/basic_json/flatten/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('from_bson', 'Function', 'api/basic_json/from_bson/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('from_cbor', 'Function', 'api/basic_json/from_cbor/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('from_msgpack', 'Function', 'api/basic_json/from_msgpack/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('from_ubjson', 'Function', 'api/basic_json/from_ubjson/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('front', 'Method', 'api/basic_json/front/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('get', 'Method', 'api/basic_json/get/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('get_allocator', 'Function', 'api/basic_json/get_allocator/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('get_binary', 'Method', 'api/basic_json/get_binary/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('get_ptr', 'Method', 'api/basic_json/get_ptr/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('get_ref', 'Method', 'api/basic_json/get_ref/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('get_to', 'Method', 'api/basic_json/get_to/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('input_format_t', 'Enum', 'api/basic_json/input_format_t/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('insert', 'Method', 'api/basic_json/insert/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('invalid_iterator', 'Class', 'api/basic_json/invalid_iterator/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('is_array', 'Method', 'api/basic_json/is_array/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('is_binary', 'Method', 'api/basic_json/is_binary/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('is_boolean', 'Method', 'api/basic_json/is_boolean/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('is_discarded', 'Method', 'api/basic_json/is_discarded/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('is_null', 'Method', 'api/basic_json/is_null/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('is_number', 'Method', 'api/basic_json/is_number/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('is_number_float', 'Method', 'api/basic_json/is_number_float/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('is_number_integer', 'Method', 'api/basic_json/is_number_integer/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('is_number_unsigned', 'Method', 'api/basic_json/is_number_unsigned/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('is_object', 'Method', 'api/basic_json/is_object/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('is_primitive', 'Method', 'api/basic_json/is_primitive/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('is_string', 'Method', 'api/basic_json/is_string/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('is_structured', 'Method', 'api/basic_json/is_structured/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('items', 'Method', 'api/basic_json/items/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('json', 'Class', 'api/json/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('json_pointer', 'Class', 'api/json_pointer/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('json_serializer', 'Type', 'api/basic_json/json_serializer/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('max_size', 'Method', 'api/basic_json/max_size/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('merge_patch', 'Method', 'api/basic_json/merge_patch/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('meta', 'Function', 'api/basic_json/meta/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('number_float_t', 'Type', 'api/basic_json/number_float_t/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('number_integer_t', 'Type', 'api/basic_json/number_integer_t/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('number_unsigned_t', 'Type', 'api/basic_json/number_unsigned_t/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('object', 'Function', 'api/basic_json/object/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('object_comparator_t', 'Type', 'api/basic_json/object_comparator_t/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('object_t', 'Type', 'api/basic_json/object_t/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('operator!=', 'Operator', 'api/basic_json/operator_ne/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('operator+=', 'Operator', 'api/basic_json/operator+=/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('operator=', 'Operator', 'api/basic_json/operator=/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('operator==', 'Operator', 'api/basic_json/operator_eq/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('operator<', 'Operator', 'api/basic_json/operator_lt/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('operator<=', 'Operator', 'api/basic_json/operator_le/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('operator>', 'Operator', 'api/basic_json/operator_gt/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('operator>=', 'Operator', 'api/basic_json/operator_ge/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('operator[]', 'Operator', 'api/basic_json/operator[]/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('operator""_json', 'Literal', 'api/basic_json/operator_literal_json/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('operator""_json_pointer', 'Literal', 'api/basic_json/operator_literal_json_pointer/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('operator ValueType', 'Operator', 'api/basic_json/operator_ValueType/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('operator value_t', 'Operator', 'api/basic_json/operator_value_t/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('ordered_json', 'Class', 'api/ordered_json/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('ordered_map', 'Class', 'api/ordered_map/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('out_of_range', 'Class', 'api/basic_json/out_of_range/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('other_error', 'Class', 'api/basic_json/other_error/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('parse', 'Function', 'api/basic_json/parse/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('parse_error', 'Class', 'api/basic_json/parse_error/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('parse_event_t', 'Enum', 'api/basic_json/parse_event_t/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('parser_callback_t', 'Type', 'api/basic_json/parser_callback_t/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('patch', 'Method', 'api/basic_json/patch/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('push_back', 'Method', 'api/basic_json/push_back/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('rbegin', 'Method', 'api/basic_json/rbegin/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('rend', 'Method', 'api/basic_json/rend/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('sax_parse', 'Function', 'api/basic_json/sax_parse/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('size', 'Method', 'api/basic_json/size/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('string_t', 'Type', 'api/basic_json/string_t/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('type', 'Method', 'api/basic_json/type/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('type_error', 'Class', 'api/basic_json/type_error/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('type_name', 'Method', 'api/basic_json/type_name/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('unflatten', 'Method', 'api/basic_json/unflatten/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('update', 'Method', 'api/basic_json/update/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('to_bson', 'Function', 'api/basic_json/to_bson/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('to_cbor', 'Function', 'api/basic_json/to_cbor/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('to_msgpack', 'Function', 'api/basic_json/to_msgpack/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('to_ubjson', 'Function', 'api/basic_json/to_ubjson/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('value', 'Method', 'api/basic_json/value/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('value_t', 'Enum', 'api/basic_json/value_t/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('~basic_json', 'Method', 'api/basic_json/~basic_json/index.html');
+
+-- Features
+INSERT INTO searchIndex(name, type, path) VALUES ('Binary Formats', 'Guide', 'features/binary_formats/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('BSON', 'Guide', 'features/binary_formats/bson/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('CBOR', 'Guide', 'features/binary_formats/cbor/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('MessagePack', 'Guide', 'features/binary_formats/messagepack/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('UBJSON', 'Guide', 'features/binary_formats/ubjson/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('Supported Macros', 'Guide', 'features/macros/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('Binary Values', 'Guide', 'features/binary_values/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('Comments', 'Guide', 'features/comments/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('Iterators', 'Guide', 'features/iterators/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('Types', 'Guide', 'features/types/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('Number Handling', 'Guide', 'features/types/number_handling/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('Element Access', 'Guide', 'features/element_access/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('JSON Pointer', 'Guide', 'features/json_pointer/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('JSON Patch and Diff', 'Guide', 'features/json_patch/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('JSON Merge Patch', 'Guide', 'features/merge_patch/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('Object Order', 'Guide', 'features/object_order/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('Parsing and Exceptions', 'Guide', 'features/parsing/parse_exceptions/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('Parser Callbacks', 'Guide', 'features/parsing/parser_callbacks/index.html');
+INSERT INTO searchIndex(name, type, path) VALUES ('SAX Interface', 'Guide', 'features/parsing/sax_interface/index.html');
+
+-- Macros
+INSERT INTO searchIndex(name, type, path) VALUES ('JSON_ASSERT', 'Macro', 'features/macros/index.html#json_assertx');
+INSERT INTO searchIndex(name, type, path) VALUES ('JSON_CATCH_USER', 'Macro', 'features/macros/index.html#json_catch_userexception');
+INSERT INTO searchIndex(name, type, path) VALUES ('JSON_DIAGNOSTICS', 'Macro', 'features/macros/index.html#json_diagnostics');
+INSERT INTO searchIndex(name, type, path) VALUES ('JSON_HAS_CPP_11', 'Macro', 'features/macros/index.html#json_has_cpp_11-json_has_cpp_14-json_has_cpp_17-json_has_cpp_20');
+INSERT INTO searchIndex(name, type, path) VALUES ('JSON_HAS_CPP_14', 'Macro', 'features/macros/index.html#json_has_cpp_11-json_has_cpp_14-json_has_cpp_17-json_has_cpp_20');
+INSERT INTO searchIndex(name, type, path) VALUES ('JSON_HAS_CPP_17', 'Macro', 'features/macros/index.html#json_has_cpp_11-json_has_cpp_14-json_has_cpp_17-json_has_cpp_20');
+INSERT INTO searchIndex(name, type, path) VALUES ('JSON_HAS_CPP_20', 'Macro', 'features/macros/index.html#json_has_cpp_11-json_has_cpp_14-json_has_cpp_17-json_has_cpp_20');
+INSERT INTO searchIndex(name, type, path) VALUES ('JSON_NOEXCEPTION', 'Macro', 'features/macros/index.html#json_noexception');
+INSERT INTO searchIndex(name, type, path) VALUES ('JSON_NO_IO', 'Macro', 'features/macros/index.html#json_no_io');
+INSERT INTO searchIndex(name, type, path) VALUES ('JSON_SKIP_UNSUPPORTED_COMPILER_CHECK', 'Macro', 'features/macros/index.html#json_skip_unsupported_compiler_check');
+INSERT INTO searchIndex(name, type, path) VALUES ('JSON_THROW_USER', 'Macro', 'features/macros/index.html#json_throw_userexception');
+INSERT INTO searchIndex(name, type, path) VALUES ('JSON_TRY_USER', 'Macro', 'features/macros/index.html#json_try_user');
+INSERT INTO searchIndex(name, type, path) VALUES ('JSON_USE_IMPLICIT_CONVERSIONS', 'Macro', 'features/macros/index.html#json_use_implicit_conversions');
+INSERT INTO searchIndex(name, type, path) VALUES ('NLOHMANN_DEFINE_TYPE_INTRUSIVE', 'Macro', 'features/macros/index.html#nlohmann_define_type_intrusivetype-member');
+INSERT INTO searchIndex(name, type, path) VALUES ('NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE', 'Macro', 'features/macros/index.html#nlohmann_define_type_non_intrusivetype-member');
+INSERT INTO searchIndex(name, type, path) VALUES ('NLOHMANN_JSON_SERIALIZE_ENUM', 'Macro', 'features/macros/index.html#nlohmann_json_serialize_enumtype');

doc/examples/README.cpp

@@ -0,0 +1,39 @@
+#include <iostream>
+#include <iomanip>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create a JSON object
+    json j =
+    {
+        {"pi", 3.141},
+        {"happy", true},
+        {"name", "Niels"},
+        {"nothing", nullptr},
+        {
+            "answer", {
+                {"everything", 42}
+            }
+        },
+        {"list", {1, 0, 2}},
+        {
+            "object", {
+                {"currency", "USD"},
+                {"value", 42.99}
+            }
+        }
+    };
+
+    // add new values
+    j["new"]["key"]["value"] = {"another", "list"};
+
+    // count elements
+    auto s = j.size();
+    j["size"] = s;
+
+    // pretty print with indent of 4 spaces
+    std::cout << std::setw(4) << j << '\n';
+}

doc/examples/README.link

@@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/IYGZTTRU0q5Ty1ev"><b>online</b></a>

doc/examples/README.output

@@ -0,0 +1,27 @@
+{
+    "answer": {
+        "everything": 42
+    },
+    "happy": true,
+    "list": [
+        1,
+        0,
+        2
+    ],
+    "name": "Niels",
+    "new": {
+        "key": {
+            "value": [
+                "another",
+                "list"
+            ]
+        }
+    },
+    "nothing": null,
+    "object": {
+        "currency": "USD",
+        "value": 42.99
+    },
+    "pi": 3.141,
+    "size": 8
+}

doc/examples/accept__string.cpp

@@ -0,0 +1,26 @@
+#include <iostream>
+#include <iomanip>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // a valid JSON text
+    auto valid_text = R"(
+    {
+        "numbers": [1, 2, 3]
+    }
+    )";
+
+    // an invalid JSON text
+    auto invalid_text = R"(
+    {
+        "strings": ["extra", "comma", ]
+    }
+    )";
+
+    std::cout << std::boolalpha
+              << json::accept(valid_text) << ' '
+              << json::accept(invalid_text) << '\n';
+}

doc/examples/accept__string.link

@@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/r5Tai1spihWHTdFA"><b>online</b></a>

doc/examples/accept__string.output

@@ -0,0 +1 @@
+true false

doc/examples/array.cpp

@@ -0,0 +1,19 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON arrays
+    json j_no_init_list = json::array();
+    json j_empty_init_list = json::array({});
+    json j_nonempty_init_list = json::array({1, 2, 3, 4});
+    json j_list_of_pairs = json::array({ {"one", 1}, {"two", 2} });
+
+    // serialize the JSON arrays
+    std::cout << j_no_init_list << '\n';
+    std::cout << j_empty_init_list << '\n';
+    std::cout << j_nonempty_init_list << '\n';
+    std::cout << j_list_of_pairs << '\n';
+}

doc/examples/array.link

@@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/Ptk2BoNyGfrZfxRU"><b>online</b></a>

doc/examples/array.output

@@ -0,0 +1,4 @@
+[]
+[]
+[1,2,3,4]
+[["one",1],["two",2]]

doc/examples/at__object_t_key_type.cpp

@@ -0,0 +1,48 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON object
+    json object =
+    {
+        {"the good", "il buono"},
+        {"the bad", "il cattivo"},
+        {"the ugly", "il brutto"}
+    };
+
+    // output element with key "the ugly"
+    std::cout << object.at("the ugly") << '\n';
+
+    // change element with key "the bad"
+    object.at("the bad") = "il cattivo";
+
+    // output changed array
+    std::cout << object << '\n';
+
+
+    // exception type_error.304
+    try
+    {
+        // use at() on a non-object type
+        json str = "I am a string";
+        str.at("the good") = "Another string";
+    }
+    catch (json::type_error& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // exception out_of_range.401
+    try
+    {
+        // try to write at a nonexisting key
+        object.at("the fast") = "il rapido";
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+}

doc/examples/at__object_t_key_type.link

@@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/055DW3OWJPwGYr92"><b>online</b></a>

doc/examples/at__object_t_key_type.output

@@ -0,0 +1,4 @@
+"il brutto"
+{"the bad":"il cattivo","the good":"il buono","the ugly":"il brutto"}
+[json.exception.type_error.304] cannot use at() with string
+[json.exception.out_of_range.403] key 'the fast' not found

doc/examples/at__object_t_key_type_const.cpp

@@ -0,0 +1,42 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON object
+    const json object =
+    {
+        {"the good", "il buono"},
+        {"the bad", "il cattivo"},
+        {"the ugly", "il brutto"}
+    };
+
+    // output element with key "the ugly"
+    std::cout << object.at("the ugly") << '\n';
+
+
+    // exception type_error.304
+    try
+    {
+        // use at() on a non-object type
+        const json str = "I am a string";
+        std::cout << str.at("the good") << '\n';
+    }
+    catch (json::type_error& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // exception out_of_range.401
+    try
+    {
+        // try to read from a nonexisting key
+        std::cout << object.at("the fast") << '\n';
+    }
+    catch (json::out_of_range)
+    {
+        std::cout << "out of range" << '\n';
+    }
+}

doc/examples/at__object_t_key_type_const.link

@@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/gM1uqvzukokLwjMa"><b>online</b></a>

doc/examples/at__object_t_key_type_const.output

@@ -0,0 +1,3 @@
+"il brutto"
+[json.exception.type_error.304] cannot use at() with string
+out of range

doc/examples/at__size_type.cpp

@@ -0,0 +1,43 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON array
+    json array = {"first", "2nd", "third", "fourth"};
+
+    // output element at index 2 (third element)
+    std::cout << array.at(2) << '\n';
+
+    // change element at index 1 (second element) to "second"
+    array.at(1) = "second";
+
+    // output changed array
+    std::cout << array << '\n';
+
+
+    // exception type_error.304
+    try
+    {
+        // use at() on a non-array type
+        json str = "I am a string";
+        str.at(0) = "Another string";
+    }
+    catch (json::type_error& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // exception out_of_range.401
+    try
+    {
+        // try to write beyond the array limit
+        array.at(5) = "sixth";
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+}

doc/examples/at__size_type.link

@@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/H3tBOr4lpufGRHlF"><b>online</b></a>

doc/examples/at__size_type.output

@@ -0,0 +1,4 @@
+"third"
+["first","second","third","fourth"]
+[json.exception.type_error.304] cannot use at() with string
+[json.exception.out_of_range.401] array index 5 is out of range

doc/examples/at__size_type_const.cpp

@@ -0,0 +1,37 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON array
+    const json array = {"first", "2nd", "third", "fourth"};
+
+    // output element at index 2 (third element)
+    std::cout << array.at(2) << '\n';
+
+
+    // exception type_error.304
+    try
+    {
+        // use at() on a non-array type
+        const json str = "I am a string";
+        std::cout << str.at(0) << '\n';
+    }
+    catch (json::type_error& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // exception out_of_range.401
+    try
+    {
+        // try to read beyond the array limit
+        std::cout << array.at(5) << '\n';
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+}

doc/examples/at__size_type_const.link

@@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/UtGhIQGxCYIml36F"><b>online</b></a>

doc/examples/at__size_type_const.output

@@ -0,0 +1,3 @@
+"third"
+[json.exception.type_error.304] cannot use at() with string
+[json.exception.out_of_range.401] array index 5 is out of range

doc/examples/at_json_pointer.cpp

@@ -0,0 +1,103 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create a JSON value
+    json j =
+    {
+        {"number", 1}, {"string", "foo"}, {"array", {1, 2}}
+    };
+
+    // read-only access
+
+    // output element with JSON pointer "/number"
+    std::cout << j.at("/number"_json_pointer) << '\n';
+    // output element with JSON pointer "/string"
+    std::cout << j.at("/string"_json_pointer) << '\n';
+    // output element with JSON pointer "/array"
+    std::cout << j.at("/array"_json_pointer) << '\n';
+    // output element with JSON pointer "/array/1"
+    std::cout << j.at("/array/1"_json_pointer) << '\n';
+
+    // writing access
+
+    // change the string
+    j.at("/string"_json_pointer) = "bar";
+    // output the changed string
+    std::cout << j["string"] << '\n';
+
+    // change an array element
+    j.at("/array/1"_json_pointer) = 21;
+    // output the changed array
+    std::cout << j["array"] << '\n';
+
+
+    // out_of_range.106
+    try
+    {
+        // try to use an array index with leading '0'
+        json::reference ref = j.at("/array/01"_json_pointer);
+    }
+    catch (json::parse_error& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // out_of_range.109
+    try
+    {
+        // try to use an array index that is not a number
+        json::reference ref = j.at("/array/one"_json_pointer);
+    }
+    catch (json::parse_error& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // out_of_range.401
+    try
+    {
+        // try to use a an invalid array index
+        json::reference ref = j.at("/array/4"_json_pointer);
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // out_of_range.402
+    try
+    {
+        // try to use the array index '-'
+        json::reference ref = j.at("/array/-"_json_pointer);
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // out_of_range.403
+    try
+    {
+        // try to use a JSON pointer to an nonexistent object key
+        json::const_reference ref = j.at("/foo"_json_pointer);
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // out_of_range.404
+    try
+    {
+        // try to use a JSON pointer that cannot be resolved
+        json::reference ref = j.at("/number/foo"_json_pointer);
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+}

doc/examples/at_json_pointer.link

@@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/NHe5FLR1KYaiHwBx"><b>online</b></a>

doc/examples/at_json_pointer.output

@@ -0,0 +1,12 @@
+1
+"foo"
+[1,2]
+2
+"bar"
+[1,21]
+[json.exception.parse_error.106] parse error: array index '01' must not begin with '0'
+[json.exception.parse_error.109] parse error: array index 'one' is not a number
+[json.exception.out_of_range.401] array index 4 is out of range
+[json.exception.out_of_range.402] array index '-' (2) is out of range
+[json.exception.out_of_range.403] key 'foo' not found
+[json.exception.out_of_range.404] unresolved reference token 'foo'

doc/examples/at_json_pointer_const.cpp

@@ -0,0 +1,79 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create a JSON value
+    const json j =
+    {
+        {"number", 1}, {"string", "foo"}, {"array", {1, 2}}
+    };
+
+    // read-only access
+
+    // output element with JSON pointer "/number"
+    std::cout << j.at("/number"_json_pointer) << '\n';
+    // output element with JSON pointer "/string"
+    std::cout << j.at("/string"_json_pointer) << '\n';
+    // output element with JSON pointer "/array"
+    std::cout << j.at("/array"_json_pointer) << '\n';
+    // output element with JSON pointer "/array/1"
+    std::cout << j.at("/array/1"_json_pointer) << '\n';
+
+    // out_of_range.109
+    try
+    {
+        // try to use an array index that is not a number
+        json::const_reference ref = j.at("/array/one"_json_pointer);
+    }
+    catch (json::parse_error& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // out_of_range.401
+    try
+    {
+        // try to use a an invalid array index
+        json::const_reference ref = j.at("/array/4"_json_pointer);
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // out_of_range.402
+    try
+    {
+        // try to use the array index '-'
+        json::const_reference ref = j.at("/array/-"_json_pointer);
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // out_of_range.403
+    try
+    {
+        // try to use a JSON pointer to an nonexistent object key
+        json::const_reference ref = j.at("/foo"_json_pointer);
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // out_of_range.404
+    try
+    {
+        // try to use a JSON pointer that cannot be resolved
+        json::const_reference ref = j.at("/number/foo"_json_pointer);
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+}

doc/examples/at_json_pointer_const.link

@@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/lbZjdwg6yII33cV5"><b>online</b></a>

doc/examples/at_json_pointer_const.output

@@ -0,0 +1,9 @@
+1
+"foo"
+[1,2]
+2
+[json.exception.parse_error.109] parse error: array index 'one' is not a number
+[json.exception.out_of_range.401] array index 4 is out of range
+[json.exception.out_of_range.402] array index '-' (2) is out of range
+[json.exception.out_of_range.403] key 'foo' not found
+[json.exception.out_of_range.404] unresolved reference token 'foo'

doc/examples/back.cpp

@@ -0,0 +1,38 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON values
+    json j_boolean = true;
+    json j_number_integer = 17;
+    json j_number_float = 23.42;
+    json j_object = {{"one", 1}, {"two", 2}};
+    json j_object_empty(json::value_t::object);
+    json j_array = {1, 2, 4, 8, 16};
+    json j_array_empty(json::value_t::array);
+    json j_string = "Hello, world";
+
+    // call back()
+    std::cout << j_boolean.back() << '\n';
+    std::cout << j_number_integer.back() << '\n';
+    std::cout << j_number_float.back() << '\n';
+    std::cout << j_object.back() << '\n';
+    //std::cout << j_object_empty.back() << '\n';  // undefined behavior
+    std::cout << j_array.back() << '\n';
+    //std::cout << j_array_empty.back() << '\n';   // undefined behavior
+    std::cout << j_string.back() << '\n';
+
+    // back() called on a null value
+    try
+    {
+        json j_null;
+        j_null.back();
+    }
+    catch (json::invalid_iterator& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+}

doc/examples/back.link

@@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/swnzqmd8zj6ij1fb"><b>online</b></a>

doc/examples/back.output

@@ -0,0 +1,7 @@
+true
+17
+23.42
+2
+16
+"Hello, world"
+[json.exception.invalid_iterator.214] cannot get value

doc/examples/basic_json__CompatibleType.cpp

@@ -0,0 +1,218 @@
+#include <iostream>
+#include <deque>
+#include <list>
+#include <forward_list>
+#include <set>
+#include <unordered_map>
+#include <unordered_set>
+#include <valarray>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // ============
+    // object types
+    // ============
+
+    // create an object from an object_t value
+    json::object_t object_value = { {"one", 1}, {"two", 2} };
+    json j_object_t(object_value);
+
+    // create an object from std::map
+    std::map<std::string, int> c_map
+    {
+        {"one", 1}, {"two", 2}, {"three", 3}
+    };
+    json j_map(c_map);
+
+    // create an object from std::unordered_map
+    std::unordered_map<const char*, double> c_umap
+    {
+        {"one", 1.2}, {"two", 2.3}, {"three", 3.4}
+    };
+    json j_umap(c_umap);
+
+    // create an object from std::multimap
+    std::multimap<std::string, bool> c_mmap
+    {
+        {"one", true}, {"two", true}, {"three", false}, {"three", true}
+    };
+    json j_mmap(c_mmap); // only one entry for key "three" is used
+
+    // create an object from std::unordered_multimap
+    std::unordered_multimap<std::string, bool> c_ummap
+    {
+        {"one", true}, {"two", true}, {"three", false}, {"three", true}
+    };
+    json j_ummap(c_ummap); // only one entry for key "three" is used
+
+    // serialize the JSON objects
+    std::cout << j_object_t << '\n';
+    std::cout << j_map << '\n';
+    std::cout << j_umap << '\n';
+    std::cout << j_mmap << '\n';
+    std::cout << j_ummap << "\n\n";
+
+
+    // ===========
+    // array types
+    // ===========
+
+    // create an array from an array_t value
+    json::array_t array_value = {"one", "two", 3, 4.5, false};
+    json j_array_t(array_value);
+
+    // create an array from std::vector
+    std::vector<int> c_vector {1, 2, 3, 4};
+    json j_vec(c_vector);
+
+    // create an array from std::valarray
+    std::valarray<short> c_valarray {10, 9, 8, 7};
+    json j_valarray(c_valarray);
+
+    // create an array from std::deque
+    std::deque<double> c_deque {1.2, 2.3, 3.4, 5.6};
+    json j_deque(c_deque);
+
+    // create an array from std::list
+    std::list<bool> c_list {true, true, false, true};
+    json j_list(c_list);
+
+    // create an array from std::forward_list
+    std::forward_list<int64_t> c_flist {12345678909876, 23456789098765, 34567890987654, 45678909876543};
+    json j_flist(c_flist);
+
+    // create an array from std::array
+    std::array<unsigned long, 4> c_array {{1, 2, 3, 4}};
+    json j_array(c_array);
+
+    // create an array from std::set
+    std::set<std::string> c_set {"one", "two", "three", "four", "one"};
+    json j_set(c_set); // only one entry for "one" is used
+
+    // create an array from std::unordered_set
+    std::unordered_set<std::string> c_uset {"one", "two", "three", "four", "one"};
+    json j_uset(c_uset); // only one entry for "one" is used
+
+    // create an array from std::multiset
+    std::multiset<std::string> c_mset {"one", "two", "one", "four"};
+    json j_mset(c_mset); // both entries for "one" are used
+
+    // create an array from std::unordered_multiset
+    std::unordered_multiset<std::string> c_umset {"one", "two", "one", "four"};
+    json j_umset(c_umset); // both entries for "one" are used
+
+    // serialize the JSON arrays
+    std::cout << j_array_t << '\n';
+    std::cout << j_vec << '\n';
+    std::cout << j_valarray << '\n';
+    std::cout << j_deque << '\n';
+    std::cout << j_list << '\n';
+    std::cout << j_flist << '\n';
+    std::cout << j_array << '\n';
+    std::cout << j_set << '\n';
+    std::cout << j_uset << '\n';
+    std::cout << j_mset << '\n';
+    std::cout << j_umset << "\n\n";
+
+
+    // ============
+    // string types
+    // ============
+
+    // create string from a string_t value
+    json::string_t string_value = "The quick brown fox jumps over the lazy dog.";
+    json j_string_t(string_value);
+
+    // create a JSON string directly from a string literal
+    json j_string_literal("The quick brown fox jumps over the lazy dog.");
+
+    // create string from std::string
+    std::string s_stdstring = "The quick brown fox jumps over the lazy dog.";
+    json j_stdstring(s_stdstring);
+
+    // serialize the JSON strings
+    std::cout << j_string_t << '\n';
+    std::cout << j_string_literal << '\n';
+    std::cout << j_stdstring << "\n\n";
+
+
+    // ============
+    // number types
+    // ============
+
+    // create a JSON number from number_integer_t
+    json::number_integer_t value_integer_t = -42;
+    json j_integer_t(value_integer_t);
+
+    // create a JSON number from number_unsigned_t
+    json::number_integer_t value_unsigned_t = 17;
+    json j_unsigned_t(value_unsigned_t);
+
+    // create a JSON number from an anonymous enum
+    enum { enum_value = 17 };
+    json j_enum(enum_value);
+
+    // create values of different integer types
+    short n_short = 42;
+    int n_int = -23;
+    long n_long = 1024;
+    int_least32_t n_int_least32_t = -17;
+    uint8_t n_uint8_t = 8;
+
+    // create (integer) JSON numbers
+    json j_short(n_short);
+    json j_int(n_int);
+    json j_long(n_long);
+    json j_int_least32_t(n_int_least32_t);
+    json j_uint8_t(n_uint8_t);
+
+    // create values of different floating-point types
+    json::number_float_t v_ok = 3.141592653589793;
+    json::number_float_t v_nan = NAN;
+    json::number_float_t v_infinity = INFINITY;
+
+    // create values of different floating-point types
+    float n_float = 42.23;
+    float n_float_nan = 1.0f / 0.0f;
+    double n_double = 23.42;
+
+    // create (floating point) JSON numbers
+    json j_ok(v_ok);
+    json j_nan(v_nan);
+    json j_infinity(v_infinity);
+    json j_float(n_float);
+    json j_float_nan(n_float_nan);
+    json j_double(n_double);
+
+    // serialize the JSON numbers
+    std::cout << j_integer_t << '\n';
+    std::cout << j_unsigned_t << '\n';
+    std::cout << j_enum << '\n';
+    std::cout << j_short << '\n';
+    std::cout << j_int << '\n';
+    std::cout << j_long << '\n';
+    std::cout << j_int_least32_t << '\n';
+    std::cout << j_uint8_t << '\n';
+    std::cout << j_ok << '\n';
+    std::cout << j_nan << '\n';
+    std::cout << j_infinity << '\n';
+    std::cout << j_float << '\n';
+    std::cout << j_float_nan << '\n';
+    std::cout << j_double << "\n\n";
+
+
+    // =============
+    // boolean types
+    // =============
+
+    // create boolean values
+    json j_truth = true;
+    json j_falsity = false;
+
+    // serialize the JSON booleans
+    std::cout << j_truth << '\n';
+    std::cout << j_falsity << '\n';
+}

doc/examples/basic_json__CompatibleType.link

@@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/RodBcX8vpcP5dQ40"><b>online</b></a>

doc/examples/basic_json__CompatibleType.output

@@ -0,0 +1,39 @@
+{"one":1,"two":2}
+{"one":1,"three":3,"two":2}
+{"one":1.2,"three":3.4,"two":2.3}
+{"one":true,"three":false,"two":true}
+{"one":true,"three":false,"two":true}
+
+["one","two",3,4.5,false]
+[1,2,3,4]
+[10,9,8,7]
+[1.2,2.3,3.4,5.6]
+[true,true,false,true]
+[12345678909876,23456789098765,34567890987654,45678909876543]
+[1,2,3,4]
+["four","one","three","two"]
+["four","three","two","one"]
+["four","one","one","two"]
+["four","two","one","one"]
+
+"The quick brown fox jumps over the lazy dog."
+"The quick brown fox jumps over the lazy dog."
+"The quick brown fox jumps over the lazy dog."
+
+-42
+17
+17
+42
+-23
+1024
+-17
+8
+3.141592653589793
+null
+null
+42.22999954223633
+null
+23.42
+
+true
+false

doc/examples/basic_json__InputIt_InputIt.cpp

@@ -0,0 +1,32 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON values
+    json j_array = {"alpha", "bravo", "charly", "delta", "easy"};
+    json j_number = 42;
+    json j_object = {{"one", "eins"}, {"two", "zwei"}};
+
+    // create copies using iterators
+    json j_array_range(j_array.begin() + 1, j_array.end() - 2);
+    json j_number_range(j_number.begin(), j_number.end());
+    json j_object_range(j_object.begin(), j_object.find("two"));
+
+    // serialize the values
+    std::cout << j_array_range << '\n';
+    std::cout << j_number_range << '\n';
+    std::cout << j_object_range << '\n';
+
+    // example for an exception
+    try
+    {
+        json j_invalid(j_number.begin() + 1, j_number.end());
+    }
+    catch (json::invalid_iterator& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+}

doc/examples/basic_json__InputIt_InputIt.link

@@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/oWFo4AhVlMBjNv8E"><b>online</b></a>

doc/examples/basic_json__InputIt_InputIt.output

@@ -0,0 +1,4 @@
+["bravo","charly"]
+42
+{"one":"eins"}
+[json.exception.invalid_iterator.204] iterators out of range

doc/examples/basic_json__basic_json.cpp

@@ -0,0 +1,17 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create a JSON array
+    json j1 = {"one", "two", 3, 4.5, false};
+
+    // create a copy
+    json j2(j1);
+
+    // serialize the JSON array
+    std::cout << j1 << " = " << j2 << '\n';
+    std::cout << std::boolalpha << (j1 == j2) << '\n';
+}

doc/examples/basic_json__basic_json.link

@@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/oRn0YsYyurs0Zi5T"><b>online</b></a>

doc/examples/basic_json__basic_json.output

@@ -0,0 +1,2 @@
+["one","two",3,4.5,false] = ["one","two",3,4.5,false]
+true

doc/examples/basic_json__copyassignment.cpp

@@ -0,0 +1,18 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON values
+    json a = 23;
+    json b = 42;
+
+    // copy-assign a to b
+    b = a;
+
+    // serialize the JSON arrays
+    std::cout << a << '\n';
+    std::cout << b << '\n';
+}

doc/examples/basic_json__copyassignment.link

@@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/kVknQzPMpqjywTpG"><b>online</b></a>

doc/examples/basic_json__copyassignment.output

@@ -0,0 +1,2 @@
+23
+23

doc/examples/basic_json__list_init_t.cpp

@@ -0,0 +1,21 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON values
+    json j_empty_init_list = json({});
+    json j_object = { {"one", 1}, {"two", 2} };
+    json j_array = {1, 2, 3, 4};
+    json j_nested_object = { {"one", {1}}, {"two", {1, 2}} };
+    json j_nested_array = { {{1}, "one"}, {{1, 2}, "two"} };
+
+    // serialize the JSON value
+    std::cout << j_empty_init_list << '\n';
+    std::cout << j_object << '\n';
+    std::cout << j_array << '\n';
+    std::cout << j_nested_object << '\n';
+    std::cout << j_nested_array << '\n';
+}

doc/examples/basic_json__list_init_t.link

@@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/yzkjGGzMOESBkCdH"><b>online</b></a>

doc/examples/basic_json__list_init_t.output

@@ -0,0 +1,5 @@
+{}
+{"one":1,"two":2}
+[1,2,3,4]
+{"one":[1],"two":[1,2]}
+[[[1],"one"],[[1,2],"two"]]

doc/examples/basic_json__moveconstructor.cpp

@@ -0,0 +1,17 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create a JSON value
+    json a = 23;
+
+    // move contents of a to b
+    json b(std::move(a));
+
+    // serialize the JSON arrays
+    std::cout << a << '\n';
+    std::cout << b << '\n';
+}

doc/examples/basic_json__moveconstructor.link

@@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/eIOvQiuID2qgxp5u"><b>online</b></a>

doc/examples/basic_json__moveconstructor.output

@@ -0,0 +1,2 @@
+null
+23

doc/examples/basic_json__nullptr_t.cpp

@@ -0,0 +1,16 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // implicitly create a JSON null value
+    json j1;
+
+    // explicitly create a JSON null value
+    json j2(nullptr);
+
+    // serialize the JSON null value
+    std::cout << j1 << '\n' << j2 << '\n';
+}

doc/examples/basic_json__nullptr_t.link

@@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/Vm0nR32x6co8rq40"><b>online</b></a>

doc/examples/basic_json__nullptr_t.output

@@ -0,0 +1,2 @@
+null
+null

doc/examples/basic_json__size_type_basic_json.cpp

@@ -0,0 +1,18 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create an array by creating copies of a JSON value
+    json value = "Hello";
+    json array_0 = json(0, value);
+    json array_1 = json(1, value);
+    json array_5 = json(5, value);
+
+    // serialize the JSON arrays
+    std::cout << array_0 << '\n';
+    std::cout << array_1 << '\n';
+    std::cout << array_5 << '\n';
+}

doc/examples/basic_json__size_type_basic_json.link

@@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/w4TtEQzlVyokIrtp"><b>online</b></a>

doc/examples/basic_json__size_type_basic_json.output

@@ -0,0 +1,3 @@
+[]
+["Hello"]
+["Hello","Hello","Hello","Hello","Hello"]

doc/examples/basic_json__value.cpp

@@ -0,0 +1,30 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create a JSON object with different entry types
+    json j =
+    {
+        {"integer", 1},
+        {"floating", 42.23},
+        {"string", "hello world"},
+        {"boolean", true},
+        {"object", {{"key1", 1}, {"key2", 2}}},
+        {"array", {1, 2, 3}}
+    };
+
+    // access existing values
+    int v_integer = j.value("integer", 0);
+    double v_floating = j.value("floating", 47.11);
+
+    // access nonexisting values and rely on default value
+    std::string v_string = j.value("nonexisting", "oops");
+    bool v_boolean = j.value("nonexisting", false);
+
+    // output values
+    std::cout << std::boolalpha << v_integer << " " << v_floating
+              << " " << v_string << " " << v_boolean << "\n";
+}

doc/examples/basic_json__value.link

@@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/mNy1nyabOkeHfHGf"><b>online</b></a>

doc/examples/basic_json__value.output

@@ -0,0 +1 @@
+1 42.23 oops false

doc/examples/basic_json__value_ptr.cpp

@@ -0,0 +1,30 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create a JSON object with different entry types
+    json j =
+    {
+        {"integer", 1},
+        {"floating", 42.23},
+        {"string", "hello world"},
+        {"boolean", true},
+        {"object", {{"key1", 1}, {"key2", 2}}},
+        {"array", {1, 2, 3}}
+    };
+
+    // access existing values
+    int v_integer = j.value("/integer"_json_pointer, 0);
+    double v_floating = j.value("/floating"_json_pointer, 47.11);
+
+    // access nonexisting values and rely on default value
+    std::string v_string = j.value("/nonexisting"_json_pointer, "oops");
+    bool v_boolean = j.value("/nonexisting"_json_pointer, false);
+
+    // output values
+    std::cout << std::boolalpha << v_integer << " " << v_floating
+              << " " << v_string << " " << v_boolean << "\n";
+}