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json/doc/mkdocs/docs/api/adl_serializer/from_json.md
Niels Lohmann 29cd970b94
Consolidate documentation (#3071) 
* 🔥 consolidate documentation
* ♻️ overwork std specializations
* 🚚 move images files to mkdocs
* ♻️ fix URLs
* 🔧 tweak MkDocs configuration
* 🔧 add namespaces
* 📝 document deprecations
* 📝 document documentation generation
* 🚸 improve search
* 🚸 add examples
* 🚧 start adding documentation for macros
* 📝 add note for https://github.com/nlohmann/json/issues/874#issuecomment-1001699139
* 📝 overwork example handling
* 📝 fix Markdown tables
2021-12-29 13:41:01 +01:00

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nlohmann::adl_serializer::from_json

// (1)
template<typename BasicJsonType, typename TargetType = ValueType>
static auto from_json(BasicJsonType && j, TargetType& val) noexcept(
    noexcept(::nlohmann::from_json(std::forward<BasicJsonType>(j), val)))
-> decltype(::nlohmann::from_json(std::forward<BasicJsonType>(j), val), void())

// (2)
template<typename BasicJsonType, typename TargetType = ValueType>
static auto from_json(BasicJsonType && j) noexcept(
noexcept(::nlohmann::from_json(std::forward<BasicJsonType>(j), detail::identity_tag<TargetType> {})))
-> decltype(::nlohmann::from_json(std::forward<BasicJsonType>(j), detail::identity_tag<TargetType> {}))

This function is usually called by the get() function of the basic_json class (either explicit or via conversion operators).

  1. This function is chosen for default-constructible value types.
  2. This function is chosen for value types which are not default-constructible.

Parameters

j (in)
JSON value to read from
val (out)
value to write to

Return value

Copy of the JSON value, converted to ValueType

!!! note

This documentation page is a stub.

Version history

  • Added in version 2.1.0.