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Valid expressions
Valid expressions有效表达式
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* `G` denotes a type meeting the requirements of [*BuffersGenerator].
* `g` denotes a value of type `G`.
* `c` denotes a possibly-const value of type `G`.
* `n` is a value of type `std::size_t`.
* `ec` is a value of type [link beast.ref.boost__beast__error_code `error_code&`].
*- `G` denotes a type meeting the requirements of [*BuffersGenerator].
* `g` denotes a value of type `G`.
* `c` denotes a possibly-const value of type `G`.
* `n` is a value of type `std::size_t`.
* `ec` is a value of type用于表示满足 [*缓冲区生成器] 要求的类型。
- `g` 用于表示类型 `G` 的值。
- `c` 用于表示类型 `G` 的可能为 const 的值。
- `n` 是类型 `std::size_t` 的值。
- `ec` 是类型 [link beast.ref.boost__beast__error_code `error_code&`]. 的值。
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In this table:
In this table在下表中:
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Requirements
Requirements要求
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* [link beast.ref.boost__beast__is_buffers_generator `is_buffers_generator`]
* __ConstBufferSequence__
* [link beast.ref.boost__beast__is_buffers_generator `is_buffers_generator`]
* __ConstBufferSequence__
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Associated Types
Associated Types关联类型
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Overloads of [link beast.ref.boost__beast__write `write`] and [link beast.ref.boost__beast__async_write `async_write`] operations are provided as free functions. These operations will consume the output of a [*BuffersGenerator] and process the data by writing them to a __SyncWriteStream__ or __AsyncWriteStream__ respectively.
Overloads of [link beast.ref.boost__beast__write `write`] and与 [link beast.ref.boost__beast__async_write `async_write`] operations are provided as free functions. These operations will consume the output of a [*BuffersGenerator] and process the data by writing them to a __操作以自由函数形式提供重载。这些操作用于调用 [*缓冲区生成器] 的输出，并分别将数据写入 SyncWriteStream__ or __ 或 AsyncWriteStream__ respectively. 进行处理。
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In this way, serializers can be adapted as [*BuffersGenerator], for example [link beast.ref.boost__beast__http__message_generator `http::message_generator`] which provides a type-erased interface for a variety of concrete http message types.
In this way, serializers can be adapted as [*BuffersGenerator], for example 通过这种方式，序列化器可适配为[*缓冲区生成器]，例如[link beast.ref.boost__beast__http__message_generator `http::message_generator`] which provides a type-erased interface for a variety of concrete http message types.用于为多种具体 HTTP 消息类型提供类型擦除接口。
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The generator will be asked to produce buffers. The consuming code will signal how much of the data has been consumed, and repeatedly query for buffers until no more data is available, or the generator indicates an error condition.
The generator will be asked to produce buffers. The consuming code will signal how much of the data has been consumed, and repeatedly query for buffers until no more data is available, or the generator indicates an error condition.该生成器将被要求生成缓冲区。调用方代码用于指示已消费的数据量，并重复查询缓冲区，直到无更多数据可用，或该生成器指示错误条件为止。
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A [*BuffersGenerator] provides a generalized interface for generating serialized data for sequential processing.
A [*BuffersGenerator] provides a generalized interface for generating serialized data for sequential processing.[*缓冲区生成器] 用于提供通用接口，以生成用于顺序处理的序列化数据。
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BuffersGenerator
BuffersGenerator缓冲区生成器
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* __ConstBufferSequence__
* __MutableBufferSequence__
* __ConstBufferSequence__
* __MutableBufferSequence__
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A [*BufferSequence] is a type meeting either of the following requirements:
A [*BufferSequence] is a type meeting either of the following requirements:[*缓冲区序列] 是指满足以下任一要求的类型：
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BufferSequence
**缓冲区序列**
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BufferSequence
BufferSequence**缓冲区序列**
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* [link beast.ref.boost__beast__http__basic_dynamic_body.writer `basic_dynamic_body::writer`]
* [link beast.ref.boost__beast__http__basic_file_body__writer `basic_file_body::writer`]
* [link beast.ref.boost__beast__http__basic_string_body.writer `basic_string_body::writer`]
* [link beast.ref.boost__beast__http__buffer_body.writer `buffer_body::writer`]
* [link beast.ref.boost__beast__http__empty_body.writer `empty_body::writer`]
* [link beast.ref.boost__beast__http__span_body.writer `span_body::writer`]
* [link beast.ref.boost__beast__http__vector_body.writer `vector_body::writer`]
* [link beast.ref.boost__beast__http__basic_dynamic_body.writer `basic_dynamic_body::writer`]
* [link beast.ref.boost__beast__http__basic_file_body__writer `basic_file_body::writer`]
* [link beast.ref.boost__beast__http__basic_string_body.writer `basic_string_body::writer`]
* [link beast.ref.boost__beast__http__buffer_body.writer `buffer_body::writer`]
* [link beast.ref.boost__beast__http__empty_body.writer `empty_body::writer`]
* [link beast.ref.boost__beast__http__span_body.writer `span_body::writer`]
* [link beast.ref.boost__beast__http__vector_body.writer `vector_body::writer`]
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Models
Models模型
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Exemplar
Exemplar示例
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Called one or more times after `init` succeeds. This function returns `boost::none` if all buffers representing the body have been returned in previous calls or if it sets `ec` to indicate an error. Otherwise, if there are buffers remaining the function should return a pair with the first element containing a non-zero length buffer sequence representing the next set of octets in the body, while the second element is a `bool` meaning `true` if there may be additional buffers returned on a subsequent call, or `false` if the buffer returned on this call is the last buffer representing the body. 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 one or more times after `init` succeeds. This function returns `boost::none` if all buffers representing the body have been returned in previous calls or if it sets `ec` to indicate an error. Otherwise, if there are buffers remaining the function should return a pair with the first element containing a non-zero length buffer sequence representing the next set of octets in the body, while the second element is a `bool` meaning `true` if there may be additional buffers returned on a subsequent call, or `false` if the buffer returned on this call is the last buffer representing the body. The function will ensure that`init` 成功后，该函数被调用一次或多次。若之前调用已返回代表该主体的所有缓冲区，或该函数设置 `ec` 用于指示错误，则该函数返回 `boost::none`。若仍存在剩余缓冲区，则该函数应返回一个 pair，其第一元素包含一个长度非零的缓冲区序列，用于表示该主体中下一组八位字节；其第二元素为 `bool` 类型，`true` 用于表示后续调用可能返回更多缓冲区，`false` 用于表示本次调用所返回的缓冲区为该主体最后一部分。该函数确保：若无错误，则 `!ec` is为 `true` if there was no error or set to the appropriate error code if there was one.；若存在错误，则将 `ec` 设为对应的错误码。
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`W<W::const_buffers_type>`
`W<W::const_buffers_type>`
06/18/2026

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