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= Value Conversion While the <<ref_value>> container makes it easy to create ad-hoc structures, often it is necessary to convert between JSON and user-defined types or types from the standard library.
= Value Conversion While the <<ref_value>> container makes it easy to create ad-hoc structures, often it is necessary to convert between JSON and user-defined types or types from the standard library.值转换 尽管 &lt;<ref_value>&gt; 容器便于创建临时结构，但通常仍需在 JSON 与用户自定义类型或标准库类型之间进行转换。</ref_value>
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File “doc/pages/conversion/overview_zh_Hans.adoc” was added. 06/05/2026
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include::custom.adoc[] include::nothrow.adoc[] include::alloc.adoc[] include::context.adoc[] include::forward.adoc[] include::direct.adoc[] include::guidelines.adoc[]
include::custom.adoc[] include::nothrow.adoc[] include::alloc.adoc[] include::context.adoc[] include::forward.adoc[] include::direct.adoc[] include::guidelines.adoc[]
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Here, the map is converted into an <<ref_object>>, since it matches <<ref_is_map_like>>. Each of its keys is converted into a <<ref_string>>, as `std::string` matches <<ref_is_string_like>>, and each of its values is converted into an <<ref_array>>, as `std::pair` matches <<ref_is_tuple_like>>. Finally, elements of pairs are converted into a `std::int64_t` number and a `bool`.
Here, the map is converted into an <<ref_object>>, since it matches <<ref_is_map_like>>. Each of its keys is converted into a <<ref_string>>, as `std::string` matches <<ref_is_string_like>>, and each of its values is converted into an <<ref_array>>, as `std::pair` matches <<ref_is_tuple_like>>. Finally, elements of pairs are converted into a `std::int64_t` number and a `bool`.
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For composite types (sequences, tuples, described classes, etc.) conversion of contained objects is applied recursively. For example:
For composite types (sequences, tuples, described classes, etc.) conversion of contained objects is applied recursively. For example:
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The result is constructed from two pointers to `const char`.
The result is constructed from two pointers to `const char`.
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The result is equal to the result of `path::generic_string`.
The result is equal to the result of `path::generic_string`.
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`std::filesystem::path` and similar types, e.g. `boost::filesystem::path`.
`std::filesystem::path` and similar types, e.g. `boost::filesystem::path`.
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Type satisfying <<ref_is_path_like>>.
Type satisfying <<ref_is_path_like>>.
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a <<ref_string>>, containing its name. Otherwise it's equal to the input value converted to its underlying type. |The result is the described enumerator, corresponding to the input <<ref_string>>.
a <<ref_string>>, containing its name. Otherwise it's equal to the input value converted to its underlying type. |The result is the described enumerator, corresponding to the input <<ref_string>>.
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If the input value is equal to one of the described enumerators, the result is
If the input value is equal to one of the described enumerators, the result is
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Type satisfying <<ref_is_described_enum>>
Type satisfying <<ref_is_described_enum>>
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corresponding values.
corresponding values.
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The result is default-constructed and described members are assigned
The result is default-constructed and described members are assigned
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The result is an <<ref_object>> with described members' names as keys.
The result is an <<ref_object>> with described members' names as keys.
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Type satisfying <<ref_is_described_class>>
Type satisfying <<ref_is_described_class>>
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The result is constructed with the array elements as constructor arguments.
The result is constructed with the array elements as constructor arguments.
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A heterogenous sequence with fixed size, e.g. `std::tuple` and `std::pair`.
A heterogenous sequence with fixed size, e.g. `std::tuple` and `std::pair`.
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