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BodyWriter
BodyWriter消息体写入器
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* [link beast.ref.boost__beast__http__basic_dynamic_body.reader `basic_dynamic_body::reader`]
* [link beast.ref.boost__beast__http__basic_file_body__reader `basic_file_body::reader`]
* [link beast.ref.boost__beast__http__basic_string_body.reader `basic_string_body::reader`]
* [link beast.ref.boost__beast__http__buffer_body.reader `buffer_body::reader`]
* [link beast.ref.boost__beast__http__empty_body.reader `empty_body::reader`]
* [link beast.ref.boost__beast__http__span_body.reader `span_body::reader`]
* [link beast.ref.boost__beast__http__vector_body.reader `vector_body::reader`]
* [link beast.ref.boost__beast__http__basic_dynamic_body.reader `basic_dynamic_body::reader`]
* [link beast.ref.boost__beast__http__basic_file_body__reader `basic_file_body::reader`]
* [link beast.ref.boost__beast__http__basic_string_body.reader `basic_string_body::reader`]
* [link beast.ref.boost__beast__http__buffer_body.reader `buffer_body::reader`]
* [link beast.ref.boost__beast__http__empty_body.reader `empty_body::reader`]
* [link beast.ref.boost__beast__http__span_body.reader `span_body::reader`]
* [link beast.ref.boost__beast__http__vector_body.reader `vector_body::reader`]
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Models
Models模型
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Exemplar
Exemplar示例
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An alias for `std::true_type` for `B`, otherwise an alias for `std::false_type`.
An alias for若 `B` 存在，则为 `std::true_type` for `B`, otherwise an alias for的别名，否则为 `std::false_type`. 的别名。
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`std::true_type`
`std::true_type`
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`is_body_reader<B>`
`is_body_reader<B>`
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This function is called when no more body octets are remaining. The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if there was one.
This function is called when no more body octets are remaining. The function will ensure that该函数在无更多消息体八位字节时调用。该函数在无错误时确保 `!ec` is为 `true` if there was no error or set to the appropriate error code if there was one.，否则将 `ec` 设置为对应的错误码。
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`a.finish(ec)`
`a.finish(ec)`
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This function is called to append some or all of the buffers specified by `b` into the body representation. The number of bytes inserted from `b` is returned. If the number of bytes inserted is less than the total input, the remainder of the input will be presented in the next call to `put`. The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if there was one.
This function is called to append some or all of the buffers specified by `b` into the body representation. The number of bytes inserted from `b` is returned. If the number of bytes inserted is less than the total input, the remainder of the input will be presented in the next call to `put`. The function will ensure that调用此函数以将 `b` 指定的部分或全部缓冲区追加到消息体表示中。返回从 `b` 插入的字节数。如果插入的字节数少于输入总量，剩余部分将在下一次调用 `put` 时传入。该函数在无错误时确保 `!ec` is为 `true` if there was no error or set to the appropriate error code if there was one.，否则将 `ec` 设置为对应的错误码。
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`std::size_t`
`std::size_t`
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`a.put(b,ec)`
`a.put(b,ec)`
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Called once to fully initialize the object before any calls to `put`. The message body is valid before entering this function, and remains valid until the reader is destroyed. The value of `n` will be set to the content length of the body if known, otherwise `n` will be equal to `boost::none`. Implementations of [*BodyReader] may use this information to optimize allocation.

The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if there was one.
Called once to fully initialize the object before any calls to `put`. The message body is valid before entering this function, and remains valid until the reader is destroyed. The value of `n` will be set to the content length of the body if known, otherwise `n` will be equal to `boost::none`. Implementations of [*BodyReader] may use this information to optimize allocation.

The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if there was one.在调用 put 之前调用一次，以完全初始化对象。消息体在进入该函数前有效，并持续有效直到读取器销毁为止。n 的值在已知时表示消息体的内容长度，否则为 boost::none。[*BodyReader] 的实现可使用此信息优化内存分配。

该函数在无错误时确保 !ec 为 true，否则将 ec 设置为对应的错误码。
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`a.init(n, ec)`
`a.init(n, ec)`
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Constructible from `h` and `v`. The lifetime of `h` and `v` is guaranteed to end no earlier than after the `R` is destroyed. The reader shall not access the contents of `h` or `v` before the first call to `init`, permitting lazy construction of the message.
Constructible from可从 `h` and和 `v`. The lifetime of 构造。`h` and和 `v` is guaranteed to end no earlier than after the `R` is destroyed. The reader shall not access the contents of的生命周期保证不早于 `R` 销毁前结束。读取器在首次调用 `init` 之前不应访问 `h` or或 `v` before the first call to `init`, permitting lazy construction of the message.的内容，以支持消息的延迟构造。
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`R{h,v};`
`R{h,v};`
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Semantics, Pre/Post-conditions
Semantics, Pre/Post-conditions语义、前置条件与后置条件
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Type
Type类型
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Expression
Expression表达式
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Valid expressions
Valid expressions有效表达式
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