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<<ref_has_value_from>> + <<ref_has_value_to>> + <<ref_is_deallocate_trivial>> + <<ref_is_described_class>> + <<ref_is_described_enum>> + <<ref_is_map_like>> + <<ref_is_null_like>> + <<ref_is_optional_like>> + <<ref_is_path_like>> + <<ref_is_sequence_like>> + <<ref_is_string_like>> + <<ref_is_tuple_like>> + <<ref_is_variant_like>> + <<ref_result_for>> + <<ref_try_value_to_tag>> + <<ref_value_from_tag>> + <<ref_value_to_tag>>
<&lt;<ref_has_value_from>> + <&gt; + &lt;<ref_has_value_to>> + <&gt; + &lt;<ref_is_deallocate_trivial>> + <&gt; + &lt;<ref_is_described_class>> + <&gt; + &lt;<ref_is_described_enum>> + <&gt; + &lt;<ref_is_map_like>> + <&gt; + &lt;<ref_is_null_like>> + <&gt; + &lt;<ref_is_optional_like>> + <&gt; + &lt;<ref_is_path_like>> + <&gt; + &lt;<ref_is_sequence_like>> + <&gt; + &lt;<ref_is_string_like>> + <&gt; + &lt;<ref_is_tuple_like>> + <&gt; + &lt;<ref_is_variant_like>> + <&gt; + &lt;<ref_result_for>> + <&gt; + &lt;<ref_try_value_to_tag>> + <&gt; + &lt;<ref_value_from_tag>> + <<ref_value_to_tag>&gt; + &lt;<ref_value_to_tag>&gt;</ref_value_to_tag></ref_value_from_tag></ref_try_value_to_tag></ref_result_for></ref_is_variant_like></ref_is_tuple_like></ref_is_string_like></ref_is_sequence_like></ref_is_path_like></ref_is_optional_like></ref_is_null_like></ref_is_map_like></ref_is_described_enum></ref_is_described_class></ref_is_deallocate_trivial></ref_has_value_to></ref_has_value_from>
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*Type Traits* +
*Type Traits类型特征* +
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*Constants* + <<ref_array_kind>> + <<ref_condition>> + <<ref_error>> + <<ref_kind>> + <<ref_number_precision>> + <<ref_object_kind>> + <<ref_string_kind>>
*Constants* + <常量* + &lt;<ref_array_kind>> + <&gt; + &lt;<ref_condition>> + <<ref_error>> + <<ref_kind>> + <&gt; + &lt;<ref_error>&gt; + &lt;<ref_kind>&gt; + &lt;<ref_number_precision>> + <&gt; + &lt;<ref_object_kind>> + <<ref_string_kind>&gt; + &lt;<ref_string_kind>&gt;</ref_string_kind></ref_object_kind></ref_number_precision></ref_kind></ref_error></ref_condition></ref_array_kind>
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*Aliases* + <<ref_parser_for>> + <<ref_string_view>>
*Aliases* + <别名* + &lt;<ref_parser_for>> + <<ref_string_view>&gt; + &lt;<ref_string_view>&gt;</ref_string_view></ref_parser_for>
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<<ref_operator_eq_eq>> + <<ref_operator_not_eq>> + <<ref_operator_gt>> + <<ref_operator_gt_eq>> + <<ref_operator_lt>> + <<ref_operator_lt_eq>> + <<ref_operator_lt_lt>> +
<&lt;<ref_operator_eq_eq>> + <&gt; + &lt;<ref_operator_not_eq>> + <&gt; + &lt;<ref_operator_gt>> + <&gt; + &lt;<ref_operator_gt_eq>> + <&gt; + &lt;<ref_operator_lt>> + <&gt; + &lt;<ref_operator_lt_eq>> + <&gt; + &lt;<ref_operator_lt_lt>> +&gt; +</ref_operator_lt_lt></ref_operator_lt_eq></ref_operator_lt></ref_operator_gt_eq></ref_operator_gt></ref_operator_not_eq></ref_operator_eq_eq>
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*Operators* +
*Operators运算符* +
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*P0308R0* + <<ref_pilfer>> + <<ref_pilfered>> + <<ref_is_pilfer_constructible>>
*P0308R0* + <&lt;<ref_pilfer>> + <&gt; + &lt;<ref_pilfered>> + <<&gt; + &lt;<ref_is_pilfer_constructible>&gt;</ref_is_pilfer_constructible></ref_pilfered></ref_pilfer>
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a| *Functions* + <<ref_get>> + <<ref_get_null_resource>> + <<ref_make_shared_resource>> + <<ref_parse>> + <<ref_parse_into>> + <<ref_result_from_errno>> + <<ref_serialize>> + <<ref_to_string>> + <<ref_try_value_to>> + <<ref_value_from>> + <<ref_value_to>> + <<ref_visit>>
a| *Functions* + <<ref_get>> + <函数* + &lt;<ref_get>&gt; + &lt;<ref_get_null_resource>> + <&gt; + &lt;<ref_make_shared_resource>> + <<ref_parse>> + <&gt; + &lt;<ref_parse>&gt; + &lt;<ref_parse_into>> + <&gt; + &lt;<ref_result_from_errno>> + <&gt; + &lt;<ref_serialize>> + <&gt; + &lt;<ref_to_string>> + <&gt; + &lt;<ref_try_value_to>> + <&gt; + &lt;<ref_value_from>> + <&gt; + &lt;<ref_value_to>> + <<ref_visit>&gt; + &lt;<ref_visit>&gt;</ref_visit></ref_value_to></ref_value_from></ref_try_value_to></ref_to_string></ref_serialize></ref_result_from_errno></ref_parse_into></ref_parse></ref_make_shared_resource></ref_get_null_resource></ref_get>
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a| *Classes* + <<ref_array>> + <<ref_basic_parser>> + <<ref_key_value_pair>> + <<ref_monotonic_resource>> + <<ref_object>> + <<ref_parser>> + <<ref_parse_options>> + <<ref_serializer>> + <<ref_serialize_options>> + <<ref_set_pointer_options>> + <<ref_static_resource>> + <<ref_storage_ptr>> + <<ref_stream_parser>> + <<ref_string>> + <<ref_value>> + <<ref_value_ref>> + <<ref_value_stack>>
a| *Classes* + <<ref_array>> + <类* + &lt;<ref_array>&gt; + &lt;<ref_basic_parser>> + <&gt; + &lt;<ref_key_value_pair>> + <&gt; + &lt;<ref_monotonic_resource>> + <&gt; + &lt;<ref_object>> + <&gt; + &lt;<ref_parser>> + <&gt; + &lt;<ref_parse_options>> + <&gt; + &lt;<ref_serializer>> + <&gt; + &lt;<ref_serialize_options>> + <&gt; + &lt;<ref_set_pointer_options>> + <&gt; + &lt;<ref_static_resource>> + <&gt; + &lt;<ref_storage_ptr>> + <&gt; + &lt;<ref_stream_parser>> + <&gt; + &lt;<ref_string>> + <<ref_value>> + <<ref_value_ref>> + <<ref_value_stack>&gt; + &lt;<ref_value>&gt; + &lt;<ref_value_ref>&gt; + &lt;<ref_value_stack>&gt;</ref_value_stack></ref_value_ref></ref_value></ref_string></ref_stream_parser></ref_storage_ptr></ref_static_resource></ref_set_pointer_options></ref_serialize_options></ref_serializer></ref_parse_options></ref_parser></ref_object></ref_monotonic_resource></ref_key_value_pair></ref_basic_parser></ref_array>
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4+|JSON
4+|JSON
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= Reference
= Reference参考
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The library's generic algorithms recognize when you are converting a <<ref_value>> to a container which resembles an array or object, so if you wanted to turn a JSON array into a vector of customers you might write:
The library's generic algorithms recognize when you are converting a <<ref_value>> to a container which resembles an array or object, so if you wanted to turn a JSON array into a vector of customers you might write:当将 &lt;<ref_value>&gt; 转换为类似数组或对象的容器时，库的通用算法可自动识别。因此若要将 JSON 数组转换为客户向量，可编写如下代码：</ref_value>
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Now we can construct customers from JSON:
Now we can construct customers from JSON:现在我们可以从 JSON 构造客户对象（customer）：
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The code above defines the convenience function `extract`, which deduces the types of the struct members. This works, but requires that the struct is {req_DefaultConstructible}. An alternative is to construct the object directly, which is a little more verbose but doesn't require default construction:
The code above defines the convenience function `extract`, which deduces the types of the struct members. This works, but requires that the struct is {req_DefaultConstructible}. An alternative is to construct the object directly, which is a little more verbose but doesn't require default construction:上述代码定义了便捷函数 `extract`，它能推导结构体成员的类型。这种方式可行，但要求该结构体是 {req_DefaultConstructible}。另一种方法是直接构造对象，虽然略显冗长，但无需默认构造：
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To go from JSON to a user-defined type we use <<ref_value_to>>, which uses another overload of `tag_invoke`. This converts a JSON value to a `customer`. It throws an exception if the contents of the value do not match what is expected:
To go from JSON to a user-defined type we use <<ref_value_to>>, which uses another overload of `tag_invoke`. This converts a JSON value to a `customer`. It throws an exception if the contents of the value do not match what is expected:为将 JSON 转换为用户定义类型，我们使用 &lt;<ref_value_to>&gt;（它会调用 `tag_invoke` 的另一个重载）。此操作将 JSON 值转换为 `customer`。若值内容不符合预期，则抛出异常：</ref_value_to>
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The library knows what to do with standard containers. Here we convert an array of customers to a value:
The library knows what to do with standard containers. Here we convert an array of customers to a value:该库能够自动处理标准容器。以下我们将一个客户数组转换为一个值：
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This allows us to use the library function <<ref_value_from>> to produce a <<ref_value>> from our type:
This allows us to use the library function <<ref_value_from>> to produce a <<这允许我们可以使用库函数 &lt;<ref_value_from>&gt; 从我们的类型生成一个 &lt;<ref_value>&gt;：</ref_value></ref_value>> _from our type:>
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We can define a conversion from the user-defined type to a <<ref_value>> by defining an overload of `tag_invoke` in the same namespace. This maps `customer` to a JSON object:
We can define a conversion from the user-defined type to a <<ref_value>> by defining an overload of `tag_invoke` in the same namespace. This maps我们可在同一命名空间中定义 `tag_invoke` 的重载，来实现从用户定义类型到 &lt;<ref_value>&gt; 的转换。此操作将 `customer` to a映射为 JSON object:对象：</ref_value>
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Given a user-defined type:
Given a user-defined type:给定一个用户定义的类型：
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