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These requirements may undergo non-backward compatible
These requirements may undergo non-backward compatible这些要求可能发生不向后兼容的变更
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Requirements
Requirements要求
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* [link beast.ref.boost__beast__http__is_body_writer `is_body_writer`]
* __Body__
* [link beast.ref.boost__beast__http__is_body_writer `is_body_writer`]
* __Body__
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Associated Types
Associated Types关联类型
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* A body that does not entirely fit in memory.
* A body produced incrementally from coroutine output.
* A body represented by zero or more buffers already in memory.
* A body whose size is not known ahead of time.
* Body data generated dynamically from other threads.
* Body data computed algorithmically.
* A body that does not entirely fit in memory.
* A body produced incrementally from coroutine output.
* A body represented by zero or more buffers already in memory.
* A body whose size is not known ahead of time.
* Body data generated dynamically from other threads.
* Body data computed algorithmically.无法完整存入内存的消息体。
* 由协程输出逐步生成的消息体。
* 由已在内存中的零个或多个缓冲区表示的消息体。
* 大小无法预先确定的消息体。
* 由其他线程动态生成的消息体数据。
* 通过算法计算得到的消息体数据。
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A [*BodyWriter] provides an [@https://en.wikipedia.org/wiki/Online_algorithm online algorithm] to obtain a sequence of zero or more buffers from a body during serialization. The implementation creates an instance of this type when needed, and calls into it one or more times to retrieve buffers holding body octets. The interface of [*BodyWriter] is intended to obtain buffers for these scenarios:
A [*BodyWriter] provides an提供一种 [@https://en.wikipedia.org/wiki/Online_algorithm online algorithm] to obtain a sequence of zero or more buffers from a body during serialization. The implementation creates an instance of this type when needed, and calls into it one or more times to retrieve buffers holding body octets. The interface of [*BodyWriter] is intended to obtain buffers for these scenarios:在线算法]，用于在序列化过程中从消息体获取零个或多个缓冲区序列。实现会在需要时创建该类型的实例，并调用一次或多次以检索包含消息体八位字节的缓冲区。[BodyWriter] 的接口设计用于获取以下场景的缓冲区：
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BodyWriter
BodyWriter消息体写入器
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Contributor joined 06/18/2026
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Translation completed 06/18/2026
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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)`
06/18/2026

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