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The result is created via <<ref_value_to_number>>.
The result is created via <<结果通过 &lt;<ref_value_to_number>&gt; 创建。</ref_value_to_number>>.
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`double` otherwise.
否则为 `double` otherwise.。
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`std::uint64_t`, if `T` is an unsigned integer; or
`std::uint64_t`, if `T` is an unsigned integer; or若 `T` 为无符号整数，则为 `std::uint64_t`；或
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`std::int64_t`, if `T` is a signed integer'; or
`std::int64_t`, if `T` is a signed integer'; or若 `T` 为有符号整数，则为 `std::int64_t`；或
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a| The result is a number equal to input and has the type
a| The result is a number equal to input and has the type结果是一个与输入值相等的数字，并且其类型为
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https://en.cppreference.com/w/cpp/types/is_arithmetic[Arithmetic type]
https://en.cppreference.com/w/cpp/types/is_arithmetic[Arithmetic type]
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`bool`
`bool`结果等于输入值。
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The result is equal to the input value.
结果等于输入值。
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Boost.JSON container.
Boost.JSON container.容器
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Custom behavior.
自定义行为。
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Custom conversion.
Custom conversion.自定义行为。
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`value_to` behavior
`value_to` behavior
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`value_from` behavior
`value_from` behavior
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Comment
Comment
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Category of T
Category of T
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For the type `T`, the appropriate conversion approach is chosen from the following list of categories. The first matching category is selected.
For the type `T`, the appropriate conversion approach is chosen from the following list of categories. The first matching category is selected.对于类型 `T`，将从以下类别列表中选择合适的转换方式，并采用第一个匹配的类别。
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The function template <<ref_value_from>> provides an interface to construct a <<ref_value>> from a type `T`. The function template <<ref_value_to>> converts in the opposite direction, from a type `T` to <<ref_value>>. Both support a wide variety of different https://en.cppreference.com/w/cpp/language/types[fundamental types], such as `int` or `double`, standard library types, such as `std::string` or `std::vector<T>`, and can be extended to support user-defined types.
The function template <<ref_value_from>> provides an interface to construct a <<ref_value>> from a type `T`. The function template <<ref_value_to>> converts in the opposite direction, from a type `T` to <<ref_value>>. Both support a wide variety of different函数模板 &lt;<ref_value_from>&gt; 提供了从类型 `T` 构造 &lt;<ref_value>&gt; 的接口。函数模板 &lt;<ref_value_to>&gt; 则执行相反方向的转换，从类型 `T` 转换为 &lt;<ref_value>&gt;。两者均支持多种不同的 https://en.cppreference.com/w/cpp/language/types[fundamental types], such as基础类型]（如 `int` or或 `double`, standard library types, such as）、标准库类型（如 `std::string` or或 `std::vector<T>`, and can be extended to support user-defined types.t>`），并可扩展以支持用户定义类型。</t></ref_value></ref_value_to></ref_value></ref_value_from>
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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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The opposite is also true: if there's a `tag_invoke` overload intended for <<ref_try_value_to>>, but not for <<ref_value_to>>, then calling <<ref_value_to>> will invoke the non-throwing overload, then construct a {ref_system_error} from the {ref_error_code} and throw it. Due to these fallbacks, it is recommended that users provide the overload from this section, rather then the other one, if they ever intend to use <<ref_try_value_to>>.
The opposite is also true: if there's a `tag_invoke` overload intended for <反之亦然：如果存在适用于&lt;<ref_try_value_to>&gt; 的 tag_invoke 重载，但没有适用于 &lt;<ref_try_value_to>>, but not for <<ref_value_to>>, then calling <<ref_value_to>> will invoke the non-throwing overload, then construct a {ref_system_error} from the {ref_error_code} and throw it. Due to these fallbacks, it is recommended that users provide the overload from this section, rather then the other one, if they ever intend to use <<&gt; 的重载，那么调用 &lt;<ref_value_to>&gt; 时会转而调用不抛异常的重载，随后根据返回的 {ref_error_code} 构造一个 {ref_system_error} 并抛出。由于存在上述回退机制，建议用户在计划使用 &lt;<ref_try_value_to>&gt; 时，优先提供本节所述的不抛异常重载，而非抛异常的重载。</ref_try_value_to></ref_value_to></ref_value_to></ref_try_value_to>>.
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