Dominik Meyer cc002ebfbb Squashed 'libs/json/' content from commit f42a74b8

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

2021-08-22 01:28:31 +02:00

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basic_json::get_to

template<typename ValueType>
ValueType& get_to(ValueType& v) const noexcept(
    noexcept(JSONSerializer<ValueType>::from_json(
        std::declval<const basic_json_t&>(), v)))

Explicit type conversion between the JSON value and a compatible value. The value is filled into the input parameter by calling the json_serializer<ValueType> from_json() method.

The function is equivalent to executing

ValueType v;
JSONSerializer<ValueType>::from_json(*this, v);

This overloads is chosen if:

ValueType is not basic_json,
json_serializer<ValueType> has a from_json() method of the form void from_json(const basic_json&, ValueType&)

Template parameters

ValueType: the value type to return

Return value

the input parameter, allowing chaining calls

Exceptions

Depends on what json_serializer<ValueType> from_json() method throws

Example

??? example

The example below shows several conversions from JSON values to other types. There a few things to note: (1)
Floating-point numbers can be converted to integers, (2) A JSON array can be converted to a standard
`#!cpp std::vector<short>`, (3) A JSON object can be converted to C++ associative containers such as
`#cpp std::unordered_map<std::string, json>`.
    
```cpp
--8<-- "examples/get_to.cpp"
```

Output:

```json
--8<-- "examples/get_to.output"
```

Version history

Since version 3.3.0.

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