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nlohmann
44 lines
995 B
Markdown
44 lines
995 B
Markdown
# <small>nlohmann::adl_serializer::</small>to_json
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```cpp
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template<typename BasicJsonType, typename TargetType = ValueType>
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static auto to_json(BasicJsonType& j, TargetType && val) noexcept(
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noexcept(::nlohmann::to_json(j, std::forward<TargetType>(val))))
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-> decltype(::nlohmann::to_json(j, std::forward<TargetType>(val)), void())
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```
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This function is usually called by the constructors of the [basic_json](../basic_json/index.md) class.
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## Parameters
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`j` (out)
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: JSON value to write to
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`val` (in)
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: value to read from
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## Examples
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??? example
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The example below shows how a `to_json` function can be implemented for a user-defined type. This function is called
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by the `adl_serializer` when the constructor `basic_json(ns::person)` is called.
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```cpp
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--8<-- "examples/to_json.cpp"
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```
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Output:
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```json
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--8<-- "examples/to_json.output"
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```
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## See also
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- [from_json](from_json.md)
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## Version history
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- Added in version 2.1.0.
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