Boost Json Translation (zh_Hans)/Doc / Pages / Dom / Value (adoc) — Chinese (Simplified Han script) @ Boost-Weblate: We can query a value for its underlying representation of …

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Key	English	Chinese (Simplified Han script)
	A 64 bit signed integer.	64位有符号整数。
:195	<<ref_kind,`kind::uint64`>>	<<ref_kind,`kind::uint64`>></ref_kind,`kind::uint64`>
	`std::uint64_t`	`std::uint64_t`
	A 64 bit unsigned integer.	64位无符号整数。
:195	<<ref_kind,`kind::double_`>>	<<ref_kind,`kind::double_`>></ref_kind,`kind::double_`>
	`double`	`double`
	A `double` holding a floating-point value.	一个`double`，用于保存浮点型值。
:195	<<ref_kind,`kind::bool_`>>	<<ref_kind,`kind::bool_`>></ref_kind,`kind::bool_`>
	https://en.cppreference.com/w/cpp/keyword/bool[`bool`]	https://en.cppreference.com/w/cpp/keyword/bool[`bool`]
	A `bool` holding `true` or `false`.	一个`bool`，用于保存`true`或`false`。
:195	<<ref_kind,`kind::null`>>	<<ref_kind,`kind::null`>></ref_kind,`kind::null`>
	^\| — \| A monostate value representing null. \|===	^\| — \| 一个表示空值的monostate值。 \|===
	The return value from emplace can be used to perform assignment or to capture a reference to the underlying element for later inspection or modification:	置入操作的返回值可用于执行赋值，或捕获对底层元素的引用以供后续检查或修改：
	If the <<ref_kind>> of a <<ref_value>> is known, functions such as <<ref_value_as_bool,`value::as_bool`>> or <<ref_value_as_string,`value::as_string`>> may be used to obtain a reference to the underlying representation without changing the existing value:	如果已知 <<ref_value>> 的 <<ref_kind>>，可使用诸如 <<ref_value_as_bool,`value::as_bool`>> 或 <<ref_value_as_string,`value::as_string`>> 等函数，在不改变现有值的情况下获取对底层表示的引用：</ref_value_as_string,`value::as_string`></ref_value_as_bool,`value::as_bool`></ref_kind></ref_value>
	However, as shown above these functions throw an exception if the kind in the <<ref_value>> does not match the kind denoted by the function signature. This can be used as a concise form of validation: access values as if they were the right type, but handle the resulting exception indicating if the schema of the JSON is not valid.	然而，如上所示，如果 <<ref_value>> 中的实际类型与函数签名所指定的类型不匹配，这些函数会抛出异常。这一行为可作为一种简洁的验证形式：以预期类型直接访问值，若 JSON 结构无效，则通过捕获异常进行处理。</ref_value>
	We can query a value for its underlying representation of a particular kind in a way that does not throw exceptions by requesting a pointer which may be null, instead of a reference. Here we use <<ref_value_if_string,`value::if_string`>> to conditionally perform an assignment without using exceptions:	我们可以通过请求一个可能为空的指针（而非引用）来查询值中特定种类的底层表示形式，而不会抛出异常。这里我们使用 <<ref_value_if_string,`value::if_string`>> 来条件执行赋值操作，而无需使用异常：</ref_value_if_string,`value::if_string`>
	Functions returning {ref_result} allow you to use both approaches:	返回 {ref_result} 的函数允许您同时使用上述两种方式：
	Formatted Output	格式化输出
	When a <<ref_value>> is formatted to a {std_ostream}, the result is serialized JSON as if by calling <<ref_serialize>>.	当将 <<ref_value>> 输出到 {std_ostream} 时，其结果等同于调用 <<ref_serialize>> 所生成的序列化 JSON。</ref_serialize></ref_value>

	English	Chinese (Simplified Han script)	Actions
	<<ref_value_as_int64>>	<<ref_value_as_int64>></ref_value_as_int64>
	null: A	空值：一种
	https://en.cppreference.com/w/cpp/utility/variant/monostate[__monostate__] value, equivalent to `nullptr`.	https://en.cppreference.com/w/cpp/utility/variant/monostate[__monostate__]（单态）值，等同于`nullptr`。
	boolean: A boolean: either `true` or `false`.	布尔值：布尔类型，取值为`true`或`false`。
	number: An integral or floating point value.	数值：整型或浮点型值。
	`std::uint64_t`	`std::uint64_t`
	Working With Values	处理值
	A <<ref_value>> constructed from `nullptr` or default constructed represents a null JSON element:	从`nullptr`构造或默认构造的 <<ref_value>> 表示一个空的JSON元素：</ref_value>
	The member function <<ref_value_kind,`value::kind`>> may be used to query the kind stored in the value. Alternatively, member functions like <<ref_value_is_object,`value::is_object`>> <<ref_value_is_number,`value::is_number`>> may be used to check whether or not the value is a particular kind:	成员函数<<ref_value_kind,`value::kind`>>可用于查询值中存储的种类。或者，也可以使用诸如<<ref_value_is_object,`value::is_object`>>、<<ref_value_is_number,`value::is_number`>> 等成员函数来检查值是否为特定种类：</ref_value_is_number,`value::is_number`></ref_value_is_object,`value::is_object`></ref_value_kind,`value::kind`>
	A 64 bit unsigned integer.	64位无符号整数。
	<<ref_value_emplace_double>>	<<ref_value_emplace_double>></ref_value_emplace_double>
	<<ref_value_if_double>>	<<ref_value_if_double>></ref_value_if_double>
	<<ref_value_emplace_uint64>>	<<ref_value_emplace_uint64>></ref_value_emplace_uint64>
	<<ref_value_is_int64>>	<<ref_value_is_int64>></ref_value_is_int64>
	<<ref_value_if_int64>>	<<ref_value_if_int64>></ref_value_if_int64>
	<<ref_value_try_as_int64>>	<<ref_value_try_as_int64>></ref_value_try_as_int64>
	<<ref_value_get_int64>>	<<ref_value_get_int64>></ref_value_get_int64>
	https://en.cppreference.com/w/cpp/types/integer[`std::uint64_t`]	https://en.cppreference.com/w/cpp/types/integer[`std::uint64_t`]
	<<ref_value_get_uint64>>	<<ref_value_get_uint64>></ref_value_get_uint64>
	https://en.cppreference.com/w/cpp/language/types[`double`]	https://en.cppreference.com/w/cpp/language/types[`double`]
	<<ref_value_try_as_double>>	<<ref_value_try_as_double>></ref_value_try_as_double>
	<<ref_value_as_double>>	<<ref_value_as_double>></ref_value_as_double>
	<<ref_value_get_double>>	<<ref_value_get_double>></ref_value_get_double>
	<<ref_value_emplace_bool>>	<<ref_value_emplace_bool>></ref_value_emplace_bool>
	<<ref_value_try_as_bool>>	<<ref_value_try_as_bool>></ref_value_try_as_bool>
	<<ref_value_get_bool>>	<<ref_value_get_bool>></ref_value_get_bool>
	If the <<ref_kind>> of a <<ref_value>> is known, functions such as <<ref_value_as_bool,`value::as_bool`>> or <<ref_value_as_string,`value::as_string`>> may be used to obtain a reference to the underlying representation without changing the existing value:	如果已知 <<ref_value>> 的 <<ref_kind>>，可使用诸如 <<ref_value_as_bool,`value::as_bool`>> 或 <<ref_value_as_string,`value::as_string`>> 等函数，在不改变现有值的情况下获取对底层表示的引用：</ref_value_as_string,`value::as_string`></ref_value_as_bool,`value::as_bool`></ref_kind></ref_value>
	However, as shown above these functions throw an exception if the kind in the <<ref_value>> does not match the kind denoted by the function signature. This can be used as a concise form of validation: access values as if they were the right type, but handle the resulting exception indicating if the schema of the JSON is not valid.	然而，如上所示，如果 <<ref_value>> 中的实际类型与函数签名所指定的类型不匹配，这些函数会抛出异常。这一行为可作为一种简洁的验证形式：以预期类型直接访问值，若 JSON 结构无效，则通过捕获异常进行处理。</ref_value>
	We can query a value for its underlying representation of a particular kind in a way that does not throw exceptions by requesting a pointer which may be null, instead of a reference. Here we use <<ref_value_if_string,`value::if_string`>> to conditionally perform an assignment without using exceptions:	我们可以通过请求一个可能为空的指针（而非引用）来查询值中特定种类的底层表示形式，而不会抛出异常。这里我们使用 <<ref_value_if_string,`value::if_string`>> 来条件执行赋值操作，而无需使用异常：</ref_value_if_string,`value::if_string`>
	Functions returning {ref_result} allow you to use both approaches:	返回 {ref_result} 的函数允许您同时使用上述两种方式：

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Chinese (Simplified Han script) 244 characters editedCurrent translationState: Translated

We can query a value for its underlying representation of a particular kind in a way that does not throw exceptions by requesting a pointer which may be null, instead of a reference. Here we use <<ref_value_if_string,`value::if_string`>> to conditionally perform an assignment without using exceptions:我们可以通过请求一个可能为空的指针（而非引用）来查询值中特定种类的底层表示形式，而不会抛出异常。这里我们使用 <<ref_value_if_string,`value::if_string`>> 来条件执行赋值操作，而无需使用异常：</ref_value_if_string,`value::if_string`>

06/05/2026

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Chinese (Simplified Han script) 302 characters editedPrevious translationState: Needs editing (Needs rewriting)

06/05/2026

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