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<<ref_object>>
<<&lt;<ref_object>&gt;</ref_object>>
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access. The interface and performance characteristics are similar to {std_vector}.
access. The interface and performance characteristics are similar to其接口和性能特性类似于 {std_vector}.。
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A sequence container of JSON values supporting dynamic size and fast, random
A sequence container of JSON values supporting dynamic size and fast, random一种支持动态大小和快速随机访问的 JSON 值序列容器。
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<<ref_array>>
<<ref_array>>&lt;&gt;
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Description
Description描述
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Type
Type一种支持动态大小和快速随机访问的 JSON 值序列容器。其接口和性能特性类似于 {std_vector}。
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= Document Model In this library the following types implement containers used to represent JSON data in memory:
= Document Model In this library the following types implement containers used to represent JSON data in memory:文档模型 在本库中，以下类型实现了用于在内存中表示 JSON 数据的容器：
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When an <<ref_object>> is formatted to a {std_ostream}, the result is a valid JSON. That is, the object will be output with curly braces and a comma separated list of key/value pairs, as per the JSON specification.
When an <当 &lt;<ref_object>> is formatted to a {std_ostream}, the result is a valid JSON. That is, the object will be output with curly braces and a comma separated list of key/value pairs, as per the JSON specification.&gt; 被格式化输出到 {std_ostream} 时，结果将是有效的 JSON。即根据 JSON 规范，对象将以花括号和逗号分隔的键/值对列表形式输出。</ref_object>
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Formatted Output
Formatted Output格式化输出
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As with `std::pair`, the <<ref_key_value_pair>> type can be used with structured bindings in {cpp}17. Specializations of `std::tuple_size`, `std::tuple_element`, and overloads of <<ref_get>> are all provided for this purpose.
As with与 `std::pair`, the < 类似，&lt;<ref_key_value_pair>> type can be used with structured bindings in {cpp}17. Specializations of&gt; 类型可用于 {cpp}17 的结构化绑定。为此专门提供了 `std::tuple_size`, 、`std::tuple_element`, and overloads of <<ref_get>> are all provided for this purpose. 的特化及 &lt;<ref_get>&gt; 的重载。</ref_get></ref_key_value_pair>
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For the complete listing of all available member functions and nested types, see the reference page for <<ref_object>>.
For the complete listing of all available member functions and nested types, see the reference page for <<要查看所有可用成员函数和嵌套类型的完整列表，请参阅 &lt;<ref_object>&gt; 的参考页面。</ref_object>>.
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Internally, the container computes a hash table over the keys so that the complexity of lookups is in constant time, on average.
Internally, the container computes a hash table over the keys so that the complexity of lookups is in constant time, on average.在内部，该容器会对键值进行哈希处理，从而使得查找操作的复杂度平均保持在恒定时间内。
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Similar to the `std` counterpart, elements may be accessed directly by their key with bounds checking using <<ref_object_at>>, or without bounds checking using <<ref_object_operator_lb_rb>> which creates a null element if the key does not already exist:
Similar to the `std` counterpart, elements may be accessed directly by their key with bounds checking using <<ref_object_at>>, or without bounds checking using <<ref_object_operator_lb_rb>> which creates a null element if the key does not already exist:与 `std` 对应容器类似，可通过 &lt;<ref_object_at>&gt; 使用边界检查直接按键访问元素，或通过 &lt;<ref_object_operator_lb_rb>&gt; 进行无边界检查访问（若键不存在则创建空元素）：</ref_object_operator_lb_rb></ref_object_at>
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Alternatively, elements may be inserted after construction:
Alternatively, elements may be inserted after construction:或或者，也可以在构造之后插入元素：
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Initializer lists consisting of two-element key value pairs can be used to construct objects with initial contents. These constructors may allocate memory and throw:
Initializer lists consisting of two-element key value pairs can be used to construct objects with initial contents. These constructors may allocate memory and throw:由两元素键值对组成的初始化列表可用于构造带有初始内容的对象。这些构造函数可能会分配内存并抛出异常：
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An empty object may be constructed without incurring any memory allocations using the <<default_memory_resource,default memory resource>>. A <<ref_storage_ptr>> can also be explicitly specified:
An empty object may be constructed without incurring any memory allocations using the <可以使用&lt;<default_memory_resource,default memory="" resource>>. A <<ref_storage_ptr>> can also be explicitly specified:="">&gt;来构造一个空对象，而无需进行任何内存分配。也可以显式指定一个&lt;<ref_storage_ptr>&gt;：</ref_storage_ptr></default_memory_resource,default>
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itself.
itself.（容器本身）
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All inserted values will use the same {ref_memory_resource} as the container
All inserted values will use the same所有插入的值将使用与容器本身相同的 {ref_memory_resource} as the container。
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The order of insertions is preserved, as long as there are no removals.
The order of insertions is preserved, as long as there are no removals.只要不发生删除操作，插入顺序即被保留。
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