49 lines
1.4 KiB
Markdown
49 lines
1.4 KiB
Markdown
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# basic_json::meta
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```cpp
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static basic_json meta();
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```
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This function returns a JSON object with information about the library, including the version number and information on
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the platform and compiler.
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## Return value
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JSON object holding version information
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key | description
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----------- | ---------------
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`compiler` | Information on the used compiler. It is an object with the following keys: `c++` (the used C++ standard), `family` (the compiler family; possible values are `clang`, `icc`, `gcc`, `ilecpp`, `msvc`, `pgcpp`, `sunpro`, and `unknown`), and `version` (the compiler version).
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`copyright` | The copyright line for the library as string.
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`name` | The name of the library as string.
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`platform` | The used platform as string. Possible values are `win32`, `linux`, `apple`, `unix`, and `unknown`.
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`url` | The URL of the project as string.
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`version` | The version of the library. It is an object with the following keys: `major`, `minor`, and `patch` as defined by [Semantic Versioning](http://semver.org), and `string` (the version string).
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## Exception safety
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Strong guarantee: if an exception is thrown, there are no changes to any JSON value.
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## Complexity
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Constant.
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## Example
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The following code shows an example output of the `meta()`
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function.
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```cpp
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--8<-- "examples/meta.cpp"
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```
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Output:
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```json
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--8<-- "examples/meta.output"
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```
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## Version history
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- Added in version 2.1.0.
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