Boost Beast Translation (zh_Hans)/Doc / Qbk / 07 Concepts / Bodywriter (qbk) — Chinese (Simplified Han script) @ Boost-Weblate: * `a` denotes a value of type `W`. * `h` …

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	English	Chinese (Simplified Han script)	Actions
	BodyWriter	BodyWriter
	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 [@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 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.
	Associated Types	Associated Types
	* [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__
	Requirements	Requirements
	These requirements may undergo non-backward compatible	These requirements may undergo non-backward compatible
	In this table:	In this table:
	* `W` denotes a type meeting the requirements of [BodyWriter]. `B` denotes a __Body__ where	* `W` denotes a type meeting the requirements of [BodyWriter]. `B` denotes a __Body__ where
	* `a` denotes a value of type `W`. * `h` denotes a const value of type `header<isRequest, Fields> const&`. * `v` denotes a possibly const value of type `Body::value_type&`. * `ec` is a value of type [link beast.ref.boost__beast__error_code `error_code&`]. * `W<T>` is the type `boost::optional<std::pair<T, bool>>`.	* `a` denotes a value of type `W`. * `h` denotes a const value of type `header<isRequest, Fields> const&`. * `v` denotes a possibly const value of type `Body::value_type&`. * `ec` is a value of type [link beast.ref.boost__beast__error_code `error_code&`]. * `W<T>` is the type `boost::optional<std::pair<T, bool>>`.
	Valid expressions	Valid expressions
	Expression	Expression
	Type	Type
	Semantics, Pre/Post-conditions	Semantics, Pre/Post-conditions
	`W::const_buffers_type`	`W::const_buffers_type`
	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`.
	`W{h,v};`	`W{h,v};`
	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 `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.
	`a.init(ec)`	`a.init(ec)`
	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.
	`a.get(ec)`	`a.get(ec)`
	`W<W::const_buffers_type>`	`W<W::const_buffers_type>`
	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 `!ec` is `true` if there was no error or set to the appropriate error code if there was one.
	Exemplar	Exemplar
	Models	Models

	English	Chinese (Simplified Han script)	Actions
	BodyWriter	BodyWriter
	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 [@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 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.
	Associated Types	Associated Types
	* [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__
	Requirements	Requirements
	These requirements may undergo non-backward compatible	These requirements may undergo non-backward compatible
	In this table:	In this table:
	* `W` denotes a type meeting the requirements of [BodyWriter]. `B` denotes a __Body__ where	* `W` denotes a type meeting the requirements of [BodyWriter]. `B` denotes a __Body__ where
	* `a` denotes a value of type `W`. * `h` denotes a const value of type `header<isRequest, Fields> const&`. * `v` denotes a possibly const value of type `Body::value_type&`. * `ec` is a value of type [link beast.ref.boost__beast__error_code `error_code&`]. * `W<T>` is the type `boost::optional<std::pair<T, bool>>`.	* `a` denotes a value of type `W`. * `h` denotes a const value of type `header<isRequest, Fields> const&`. * `v` denotes a possibly const value of type `Body::value_type&`. * `ec` is a value of type [link beast.ref.boost__beast__error_code `error_code&`]. * `W<T>` is the type `boost::optional<std::pair<T, bool>>`.
	Valid expressions	Valid expressions
	Expression	Expression
	Type	Type
	Semantics, Pre/Post-conditions	Semantics, Pre/Post-conditions
	`W::const_buffers_type`	`W::const_buffers_type`
	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`.
	`W{h,v};`	`W{h,v};`
	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 `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.
	`a.init(ec)`	`a.init(ec)`
	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.
	`a.get(ec)`	`a.get(ec)`
	`W<W::const_buffers_type>`	`W<W::const_buffers_type>`
	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 `!ec` is `true` if there was no error or set to the appropriate error code if there was one.
	Exemplar	Exemplar

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06/05/2026

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type: list

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string ID 44

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