Boost Json Translation (zh_Hans)/Doc / Pages / Dom / Value (adoc) — Chinese (Simplified Han script) @ Boost-Weblate: ^| — | A monostate value representing null. |===

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Key	English	Chinese (Simplified Han script)
	A https://en.wikipedia.org/wiki/UTF-8[__UTF-8__] encoded	一个采用https://en.wikipedia.org/wiki/UTF-8[__UTF-8__]编码的
	https://en.wikipedia.org/wiki/Unicode[Unicode] https://en.wikipedia.org/wiki/String_(computer_science)[string] of characters with an interface similar to {std_string}.	https://en.wikipedia.org/wiki/Unicode[Unicode]字符https://en.wikipedia.org/wiki/String_(computer_science)[字符串]，其接口类似于{std_string}。
:195	<<ref_kind,`kind::int64`>>	<<ref_kind,`kind::int64`>></ref_kind,`kind::int64`>
	`std::int64_t`	`std::int64_t`
	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_if_bool>>	<<ref_value_if_bool>></ref_value_if_bool>
	<<ref_value_as_bool>>	<<ref_value_as_bool>></ref_value_as_bool>
	<<ref_value_is_array>>	<<ref_value_is_array>></ref_value_is_array>
	<<ref_value_emplace_object>>	<<ref_value_emplace_object>></ref_value_emplace_object>
	<<ref_value_as_object>>	<<ref_value_as_object>></ref_value_as_object>
	<<ref_value_get_object>>	<<ref_value_get_object>></ref_value_get_object>
	<<ref_value_try_as_string>>	<<ref_value_try_as_string>></ref_value_try_as_string>
	<<ref_value_if_uint64>>	<<ref_value_if_uint64>></ref_value_if_uint64>
	<<ref_value_is_double>>	<<ref_value_is_double>></ref_value_is_double>
	https://en.cppreference.com/w/cpp/language/types[`bool`]	https://en.cppreference.com/w/cpp/language/types[`bool`]
	<<ref_value_is_bool>>	<<ref_value_is_bool>></ref_value_is_bool>
	^\|— \|<<ref_value_try_as_null>> ^\|— ^\|—	^\|— \|<<ref_value_try_as_null>> ^\|— ^\|—</ref_value_try_as_null>
	A https://en.wikipedia.org/wiki/UTF-8[__UTF-8__] encoded	一个采用https://en.wikipedia.org/wiki/UTF-8[__UTF-8__]编码的
	`std::int64_t`	`std::int64_t`
	A 64 bit signed integer.	64位有符号整数。
	^\| — \| A monostate value representing null. \|===	^\| — \| 一个表示空值的monostate值。 \|===
	https://en.cppreference.com/w/cpp/language/nullptr[`std::nullptr_t`]	https://en.cppreference.com/w/cpp/language/nullptr[`std::nullptr_t`]
	<<ref_value_emplace_null>>	<<ref_value_emplace_null>></ref_value_emplace_null>
	<<ref_value_is_null>>	<<ref_value_is_null>></ref_value_is_null>
	The emplace members of <<ref_value>> return a typed reference to the underlying representation. For example, the call to <<ref_value_emplace_string,`value::emplace_string`>> in the previous example returns a <<ref_string,`string&`>>. This table shows the underlying type for each kind:	<<ref_value>> 的置入成员函数返回对底层表示形式的类型化引用。例如，前例中对 <<ref_value_emplace_string,`value::emplace_string`>> 的调用返回一个 <<ref_string,`string&`>> 。下表列出了每种 kind 对应的底层类型：</ref_string,`string&`></ref_value_emplace_string,`value::emplace_string`></ref_value>
	Type	类型
	Description	描述
	An associative array of string keys mapping to <<ref_value>> elements with an	一个关联数组，其键为字符串，值为 <<ref_value>> 元素，接口</ref_value>
	interface similar to {std_unordered_map}, that remembers insertion order.	类似于 {std_unordered_map}，并保留插入顺序
	An ordered list of <<ref_value>> elements with an interface similar to	一个<<ref_value>>元素的有序列表，其接口类似于</ref_value>
	{std_vector}.	{std_vector}。
	https://en.wikipedia.org/wiki/Unicode[Unicode] https://en.wikipedia.org/wiki/String_(computer_science)[string] of characters with an interface similar to {std_string}.	https://en.wikipedia.org/wiki/Unicode[Unicode]字符https://en.wikipedia.org/wiki/String_(computer_science)[字符串]，其接口类似于{std_string}。
	`double`	`double`
	A `double` holding a floating-point value.	一个`double`，用于保存浮点型值。
	https://en.cppreference.com/w/cpp/keyword/bool[`bool`]	https://en.cppreference.com/w/cpp/keyword/bool[`bool`]

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06/05/2026

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Chinese (Simplified Han script) 54 characters editedPrevious translationState: Needs editing (Needs rewriting)

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safe-html, strict-same

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42664

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:212

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doc/pages/dom/value_zh_Hans.adoc, string 108

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