Boost Beast Translation (zh_Hans)/Doc / Qbk / 07 Concepts / Bodywriter (qbk)

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2 string ID 12
	Source string description type: paragraph

	English 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: 397/10000 · 397
3 string ID 20
	Source string description type: list

	English * 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. 305/10000 · 305
4 string ID 27
	Source string description type: heading

	English Associated Types 16/10000 · 16
5 string ID 29
	Source string description type: list

	English * [link beast.ref.boost__beast__http__is_body_writer `is_body_writer`] * __Body__ 81/10000 · 81
6 string ID 32
	Source string description type: heading

	English Requirements 12/10000 · 12
7 string ID 35
	Source string description type: paragraph

	English These requirements may undergo non-backward compatible 54/10000 · 54
8 string ID 39
	Source string description type: paragraph

	English In this table: 14/10000 · 14
9 string ID 41
	Source string description type: list

	English * `W` denotes a type meeting the requirements of [BodyWriter]. `B` denotes a __Body__ where 94/10000 · 94
10 string ID 44
	Source string description type: list

	English * `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>>`. 315/10000 · 315
11 string ID 50
	Source string description type: table title

	English Valid expressions 17/10000 · 17
12 string ID 50
	Source string description type: table cell

	English Expression 10/10000 · 10
13 string ID 50
	Source string description type: table cell

	English Type 4/10000 · 4
14 string ID 50
	Source string description type: table cell

	English Semantics, Pre/Post-conditions 30/10000 · 30
15 string ID 50
	Source string description type: table cell

	English `W::const_buffers_type` 23/10000 · 23
16 string ID 50
	Source string description type: table cell

	English A type which meets the requirements of __ConstBufferSequence__. This is the type of buffer returned by `W::get`. 112/10000 · 112
17 string ID 50
	Source string description type: table cell

	English `W{h,v};` 9/10000 · 9
18 string ID 50
	Source string description type: table cell

	English 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. 753/10000 · 753
19 string ID 50
	Source string description type: table cell

	English `a.init(ec)` 12/10000 · 12
20 string ID 50
	Source string description type: table cell

	English 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. 303/10000 · 303
21 string ID 50
	Source string description type: table cell

	English `a.get(ec)` 11/10000 · 11

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