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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。
06/18/2026
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Translation changed
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：
06/18/2026
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Translation changed
BodyWriter
BodyWriter消息体写入器
06/18/2026
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Contributor joined
Contributor joined 06/18/2026
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Translation completed
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`]
06/18/2026
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Translation changed
Models
Models模型
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Exemplar
Exemplar示例
06/18/2026
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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。
06/18/2026
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Translation changed
`std::true_type`
`std::true_type`
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Translation changed
`is_body_reader<B>`
`is_body_reader<B>`
06/18/2026
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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。
06/18/2026
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Translation changed
`a.finish(ec)`
`a.finish(ec)`
06/18/2026
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Translation changed
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。
06/18/2026
User avatar Bstran

Translation changed
`std::size_t`
`std::size_t`
06/18/2026
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Translation changed
`a.put(b,ec)`
`a.put(b,ec)`
06/18/2026
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Translation changed
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。
06/18/2026
User avatar Bstran

Translation changed
`a.init(n, ec)`
`a.init(n, ec)`
06/18/2026
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Translation changed
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。
06/18/2026
User avatar Bstran

Translation changed
`R{h,v};`
`R{h,v};`
06/18/2026

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