Boost Beast Translation (zh_Hans)/Doc / Qbk / 07 Concepts / Buffersgenerator (qbk) — Chinese (Simplified Han script) @ Boost-Weblate: This function is called to signal that the consumer (caller) …

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This function is called to signal that the consumer (caller) of the generator has processed part of the data returned by the previous call to `prepare`.

The value of `n` indicates how much of the data processed (in bytes).

When `n` exceeds the number of bytes returned from the last call to `prepare`, `consume` shall behave as if `n` was equal to that number.

Remaining unconsumed data will be returned from subsequent calls to `prepare`.

[*Note:] Any buffers obtained by previous calls to `prepare` are invalidated.

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Key	English	Chinese (Simplified Han script)
	Requirements	Requirements
	In this table:	In this table:
	* `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 [link beast.ref.boost__beast__error_code `error_code&`].
	Valid expressions	Valid expressions
	Expression	Expression
	Type	Type
	Semantics, Pre/Post-conditions	Semantics, Pre/Post-conditions
45	`G::const_buffers_type`
	A type which meets the requirements of __ConstBufferSequence__. This is the type of buffer returned by `g.prepare(ec)`.	A type which meets the requirements of __ConstBufferSequence__. This is the type of buffer returned by `g.prepare(ec)`.
	`c.is_done()`	`c.is_done()`
	`bool`	`bool`
	Called to ask the generator for its completion status. A generator has completed when no new buffer will be produced and previously produced buffers have been fully consumed. [*Note:] The result of invoking `prepare` on `g` once it has completed is unspecified.	Called to ask the generator for its completion status. A generator has completed when no new buffer will be produced and previously produced buffers have been fully consumed. [*Note:] The result of invoking `prepare` on `g` once it has completed is unspecified.
	`g.prepare(ec)`	`g.prepare(ec)`
	Called to ask the generator to produce buffers containing data for processing. The returned value is the __ConstBufferSequence__ representing unconsumed data. The function will ensure that `ec.failed()` is `false` if there was no error or set to the appropriate error code if there was one. If no unconsumed data is available, this operation shall make progress to eventually reach completion. The result of invoking `prepare` after completion or encountered error(s) is defined by the generator implementation. It can not be assumed to be meaningful or safe to do so, in general. The capacity of the buffer returned is defined by the generator implementation. [*Note:] Any buffers obtained by previous calls to `prepare` are invalidated.	Called to ask the generator to produce buffers containing data for processing. The returned value is the __ConstBufferSequence__ representing unconsumed data. The function will ensure that `ec.failed()` is `false` if there was no error or set to the appropriate error code if there was one. If no unconsumed data is available, this operation shall make progress to eventually reach completion. The result of invoking `prepare` after completion or encountered error(s) is defined by the generator implementation. It can not be assumed to be meaningful or safe to do so, in general. The capacity of the buffer returned is defined by the generator implementation. [*Note:] Any buffers obtained by previous calls to `prepare` are invalidated.
	`g.consume(n)`	`g.consume(n)`
	This function is called to signal that the consumer (caller) of the generator has processed part of the data returned by the previous call to `prepare`. The value of `n` indicates how much of the data processed (in bytes). When `n` exceeds the number of bytes returned from the last call to `prepare`, `consume` shall behave as if `n` was equal to that number. Remaining unconsumed data will be returned from subsequent calls to `prepare`. [*Note:] Any buffers obtained by previous calls to `prepare` are invalidated.	This function is called to signal that the consumer (caller) of the generator has processed part of the data returned by the previous call to `prepare`. The value of `n` indicates how much of the data processed (in bytes). When `n` exceeds the number of bytes returned from the last call to `prepare`, `consume` shall behave as if `n` was equal to that number. Remaining unconsumed data will be returned from subsequent calls to `prepare`. [*Note:] Any buffers obtained by previous calls to `prepare` are invalidated.
	`is_buffers_generator<G>`	`is_buffers_generator<G>`
	`std::bool_constant`	`std::bool_constant`
	An alias for `std::true_type` for `G`, otherwise an alias for `std::false_type`.	An alias for `std::true_type` for `G`, otherwise an alias for `std::false_type`.
	Exemplar	Exemplar
122	```	```
135	```	```
	Models	Models
	* [link beast.ref.boost__beast__http__message_generator `http::message_generator`]	* [link beast.ref.boost__beast__http__message_generator `http::message_generator`]
	Algorithms	Algorithms
	* [link beast.ref.boost__beast__async_write `async_write`] * [link beast.ref.boost__beast__write `write`]	* [link beast.ref.boost__beast__async_write `async_write`] * [link beast.ref.boost__beast__write `write`]

Key	English	Chinese (Simplified Han script)
	Algorithms	Algorithms
	Valid expressions	Valid expressions
	Expression	Expression
	Type	Type
	Semantics, Pre/Post-conditions	Semantics, Pre/Post-conditions
	Models	Models
	* [link beast.ref.boost__beast__http__message_generator `http::message_generator`]	* [link beast.ref.boost__beast__http__message_generator `http::message_generator`]
	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.
	A type which meets the requirements of __ConstBufferSequence__. This is the type of buffer returned by `g.prepare(ec)`.	A type which meets the requirements of __ConstBufferSequence__. This is the type of buffer returned by `g.prepare(ec)`.
	`c.is_done()`	`c.is_done()`
	`bool`	`bool`
	Called to ask the generator for its completion status. A generator has completed when no new buffer will be produced and previously produced buffers have been fully consumed. [*Note:] The result of invoking `prepare` on `g` once it has completed is unspecified.	Called to ask the generator for its completion status. A generator has completed when no new buffer will be produced and previously produced buffers have been fully consumed. [*Note:] The result of invoking `prepare` on `g` once it has completed is unspecified.
	`g.prepare(ec)`	`g.prepare(ec)`
	BuffersGenerator	BuffersGenerator
	Called to ask the generator to produce buffers containing data for processing. The returned value is the __ConstBufferSequence__ representing unconsumed data. The function will ensure that `ec.failed()` is `false` if there was no error or set to the appropriate error code if there was one. If no unconsumed data is available, this operation shall make progress to eventually reach completion. The result of invoking `prepare` after completion or encountered error(s) is defined by the generator implementation. It can not be assumed to be meaningful or safe to do so, in general. The capacity of the buffer returned is defined by the generator implementation. [*Note:] Any buffers obtained by previous calls to `prepare` are invalidated.	Called to ask the generator to produce buffers containing data for processing. The returned value is the __ConstBufferSequence__ representing unconsumed data. The function will ensure that `ec.failed()` is `false` if there was no error or set to the appropriate error code if there was one. If no unconsumed data is available, this operation shall make progress to eventually reach completion. The result of invoking `prepare` after completion or encountered error(s) is defined by the generator implementation. It can not be assumed to be meaningful or safe to do so, in general. The capacity of the buffer returned is defined by the generator implementation. [*Note:] Any buffers obtained by previous calls to `prepare` are invalidated.
	`g.consume(n)`	`g.consume(n)`
	This function is called to signal that the consumer (caller) of the generator has processed part of the data returned by the previous call to `prepare`. The value of `n` indicates how much of the data processed (in bytes). When `n` exceeds the number of bytes returned from the last call to `prepare`, `consume` shall behave as if `n` was equal to that number. Remaining unconsumed data will be returned from subsequent calls to `prepare`. [*Note:] Any buffers obtained by previous calls to `prepare` are invalidated.	This function is called to signal that the consumer (caller) of the generator has processed part of the data returned by the previous call to `prepare`. The value of `n` indicates how much of the data processed (in bytes). When `n` exceeds the number of bytes returned from the last call to `prepare`, `consume` shall behave as if `n` was equal to that number. Remaining unconsumed data will be returned from subsequent calls to `prepare`. [*Note:] Any buffers obtained by previous calls to `prepare` are invalidated.
	`is_buffers_generator<G>`	`is_buffers_generator<G>`
	`std::bool_constant`	`std::bool_constant`
	An alias for `std::true_type` for `G`, otherwise an alias for `std::false_type`.	An alias for `std::true_type` for `G`, otherwise an alias for `std::false_type`.
	Exemplar	Exemplar
122	```	```
135	```	```
45	`G::const_buffers_type`

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06/05/2026

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type: table cell

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string ID 45

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doc/qbk/07_concepts/BuffersGenerator_zh_Hans.qbk, string 23

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