json/docs/mkdocs/docs/api/adl_serializer/to_json.md

nlohmann::adl_serializer::to_json

template<typename BasicJsonType, typename TargetType = ValueType>
static auto to_json(BasicJsonType& j, TargetType && val) noexcept(
    noexcept(::nlohmann::to_json(j, std::forward<TargetType>(val))))
-> decltype(::nlohmann::to_json(j, std::forward<TargetType>(val)), void())

This function is usually called by the constructors of the basic_json class.

Parameters

j (out)

JSON value to write to

val (in)

value to read from

Examples

??? example

The example below shows how a `to_json` function can be implemented for a user-defined type. This function is called
by the `adl_serializer` when the constructor `basic_json(ns::person)` is called.
    
```cpp
--8<-- "examples/to_json.cpp"
```

Output:

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

See also

• from_json

Version history

• Added in version 2.1.0.