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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>`
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`a.get(ec)`
`a.get(ec)`
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Called once to fully initialize the object before any calls to `get`. The message body becomes valid before entering this function, and remains valid until the writer is destroyed. 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 `get`. The message body becomes valid before entering this function, and remains valid until the writer is destroyed. The function will ensure that `!ec` is `true` if there was no error or set to the appropriate error code if there was one.最终译文：在调用 get 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，并持续有效直到写入器销毁。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(ec)`
`a.init(ec)`
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Constructible from `h` and `v`. The lifetime of `h` and `v` are guaranteed to end no earlier than after the `W` is destroyed. The writer shall not access the contents of `h` or `v` before the first call to `init`, permitting lazy construction of the message.

The constructor may optionally require that `h` and `v` are `const` references, with these consequences:

* If `W` requires that `h` and `v` are const references, then the corresponding serializer constructors for messages with this body type will will accept a const reference to a message, otherwise:

* If `W` requires that `h` and `v` are non-const references, then the corresponding serializer constructors for messages with this body type will require a non-const reference to a message.
Constructible from可从 `h` and和 `v`. The lifetime of 构造。`h` and和 `v` are guaranteed to end no earlier than after the `W` is destroyed. The writer shall not access the contents of的生命周期保证不早于 `W` 销毁前结束。写入器在首次调用 `init` 之前不应访问 `h` or或 `v` before the first call to `init`, permitting lazy construction of the message.

The constructor may optionally require that的内容，以支持消息的延迟构造。

构造函数可选择要求 `h` and和 `v` are `const` references, with these consequences:为 const 引用，其影响如下：

* If若 `W` requires that要求 `h` and和 `v` are为 const references, then the corresponding serializer constructors for messages with this body type will will accept a const reference to a message, otherwise:

* If `W` requires that引用，则对应消息体类型的序列化器构造函数将接受对消息的 const 引用。
* 否则，若 `W` 要求 `h` and和 `v` are non-const references, then the corresponding serializer constructors for messages with this body type will require a non-const reference to a message.为非 const 引用，则对应消息体类型的序列化器构造函数将要求对消息的非 const 引用。
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`W{h,v};`
`W{h,v};`
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A type which meets the requirements of __ConstBufferSequence__. This is the type of buffer returned by `W::get`.
A type which meets the requirements of __ConstBufferSequence__. This is the type of buffer returned by `W::get`.该类型满足 ConstBufferSequence 的要求，为 W::get 返回的缓冲区类型。
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`W::const_buffers_type`
`W::const_buffers_type`
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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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