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type: table cell
This function returns the first buffer in a buffer sequence, or a buffer of size zero if the buffer sequence has no elements.
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Buffer Types
缓冲区类型
To facilitate working with instances of the __ConstBufferSequence__ and __MutableBufferSequence__ concepts introduced in __Asio__, Beast treats those sequences as a special type of range. The following algorithms and wrappers are provided which transform these ranges efficiently using lazy evaluation. No memory allocations are used in the transformations; instead, they create lightweight iterators over the existing, unmodified memory buffers. Control of buffers is retained by the caller; ownership is not transferred.
为方便处理 __Asio__ 中定义的 __ConstBufferSequence__ 和 __MutableBufferSequence__ 这两种概念，Beast 将它们视为一种特殊的范围类型。该库提供以下算法和包装器，采用延迟求值的方式对这类范围进行高效转换。转换时不会分配内存，只是在已有且未修改的内存缓冲区上创建轻量级迭代器。缓冲区的控制权依然属于调用方，不涉及所有权转移。
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Buffer Algorithms and Types
缓冲区算法与类型
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Name
名称
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Description
描述
[link beast.ref.boost__beast__buffer_bytes `buffer_bytes`]
[link beast.ref.boost__beast__buffer_bytes `buffer_bytes`]
This is a more reliable version of [@boost:/doc/html/boost_asio/reference/buffer_size.html `net::buffer_size`] which is easier to use and also works for types which are convertible to `net::const_buffer` or `net::mutable_buffer`.
这是一个更可靠的 `net::buffer_size` 版本，使用起来更简单，并且适用于可转换为 `net::const_buffer` 或 `net::mutable_buffer` 的类型。
[link beast.ref.boost__beast__buffers_cat `buffers_cat`]
[link beast.ref.boost__beast__buffers_cat `buffers_cat`]
This functions returns a new buffer sequence which, when iterated, traverses the sequence which would be formed if all of the input buffer sequences were concatenated. With this routine, multiple calls to a stream's `write_some` function may be combined into one, eliminating expensive system calls.
该函数返回一个新的缓冲区序列，对该序列进行迭代遍历时，其效果相当于将所有输入缓冲区序列拼接在一起。利用该例程，可以将对流 `write_some` 函数的多次调用合并为一次，从而减少昂贵的系统调用。
[link beast.ref.boost__beast__buffers_cat_view `buffers_cat_view`]
[link beast.ref.boost__beast__buffers_cat_view `buffers_cat_view`]
This class represents the buffer sequence formed by concatenating two or more buffer sequences. This is type of object returned by [link beast.ref.boost__beast__buffers_cat `buffers_cat`].
该类表示将两个或多个缓冲区序列拼接后形成的新缓冲区序列。该类型与 [link beast.ref.boost__beast__buffers_cat `buffers_cat`] 返回的对象类型一致。
[link beast.ref.boost__beast__buffers_front `buffers_front`]
[link beast.ref.boost__beast__buffers_front `buffers_front`]
This function returns the first buffer in a buffer sequence, or a buffer of size zero if the buffer sequence has no elements.
该函数用于返回缓冲区序列中的第一个缓冲区。如果该序列为空，则返回一个大小为零的缓冲区。
[link beast.ref.boost__beast__buffers_prefix `buffers_prefix`]
[link beast.ref.boost__beast__buffers_prefix `buffers_prefix`]
This function returns a new buffer or buffer sequence which represents a prefix of the original buffers.
该函数用于返回一个代表原始缓冲区前缀的新缓冲区或缓冲区序列。
[link beast.ref.boost__beast__buffers_prefix_view `buffers_prefix_view`]
[link beast.ref.boost__beast__buffers_prefix_view `buffers_prefix_view`]
This class represents the buffer sequence formed from a prefix of an existing buffer sequence. This is the type of buffer returned by [link beast.ref.boost__beast__buffers_prefix `buffers_prefix`].
该类表示从现有缓冲区序列前缀中形成的新缓冲区序列。该类型与 [link beast.ref.boost__beast__buffers_prefix `buffers_prefix`] 返回的缓冲区类型一致。
[link beast.ref.boost__beast__buffers_range `buffers_range`] [link beast.ref.boost__beast__buffers_range_ref `buffers_range_ref`]
[link beast.ref.boost__beast__buffers_range `buffers_range`] [link beast.ref.boost__beast__buffers_range_ref `buffers_range_ref`]
This function returns an iterable range representing the passed buffer sequence. The values obtained when iterating the range will always be a constant buffer, unless the underlying buffer sequence is mutable, in which case the value obtained when iterating will be a mutable buffer. It is intended as a notational convenience when writing a ['range-for] statement over a buffer sequence.

The function [link beast.ref.boost__beast__buffers_range_ref `buffers_range`] maintains a copy of the buffer sequence, while [link beast.ref.boost__beast__buffers_range_ref `buffers_range_ref`] maintains a reference (in this case, the caller must ensure that the lifetime of the referenced buffer sequence extends until the range object is destroyed).
该函数用于返回一个表示所传入缓冲区序列的可迭代范围。迭代该范围时获取的值始终为常量缓冲区，除非底层缓冲区序列是可变的，此时迭代获取的值将变为可变缓冲区。该函数旨在为编写遍历缓冲区序列的 [范围 for] 语句提供便捷的语法表达。

[link beast.ref.boost__beast__buffers_range `buffers_range`] 函数会保留缓冲区序列的副本，而 [link beast.ref.boost__beast__buffers_range_ref `buffers_range_ref`] 则只保留引用（此时调用方需确保被引用缓冲区序列的生命周期延续到该范围对象销毁为止）。
[link beast.ref.boost__beast__buffers_suffix `buffers_suffix`]
[link beast.ref.boost__beast__buffers_suffix `buffers_suffix`]
This class wraps the underlying memory of an existing buffer sequence and presents a suffix of the original sequence. The length of the suffix may be progressively shortened. This lets callers work with sequential increments of a buffer sequence.
该类用于包装现有缓冲区序列的底层内存，并呈现原始序列的一个后缀。该后缀的长度可以逐步缩短，方便调用方按顺序逐步处理缓冲区序列中的内容。
[link beast.ref.boost__beast__buffers_to_string `buffers_to_string`]
[link beast.ref.boost__beast__buffers_to_string `buffers_to_string`]
This function converts a buffer sequence to a `std::string`. It can be used for diagnostic purposes and tests.
该函数用于将缓冲区序列转换为 `std::string` 字符串，可用于诊断和测试场景。
[link beast.ref.boost__beast__buffer_ref `buffer_ref`] [link beast.ref.boost__beast__ref `ref`]
[link beast.ref.boost__beast__buffer_ref `buffer_ref`] [link beast.ref.boost__beast__ref `ref`]
This function converts a beast buffer, that is to be passed by reference, into a buffer reference, that can be passed by value into asio functions.

It implements the __DynamicBuffer__v2__ concept.
该函数用于将通过引用传递的 Beast 缓冲区转换为可通过值传递给 Asio 函数的缓冲区引用。该函数实现了 __DynamicBuffer__v2__ 概念。
The __DynamicBuffer__ concept introduced in __Asio__ models a buffer sequence which supports an owning, resizable range. Beast provides this set of additional implementations of the dynamic buffer concept:
__Asio__ 中引入的 __DynamicBuffer__ 概念用于描述一种支持所有权且可调整大小的缓冲区序列。Beast 提供以下一组动态缓冲区概念的补充实现：
Dynamic Buffer Implementations
动态缓冲区实现类型
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名称
Key English Chinese (Simplified Han script) Actions
This function returns the first buffer in a buffer sequence, or a buffer of size zero if the buffer sequence has no elements.
该函数用于返回缓冲区序列中的第一个缓冲区。如果该序列为空，则返回一个大小为零的缓冲区。
Dynamic Buffer Implementations
动态缓冲区实现类型
Note that copies always requires a new call to `data` and `prepare`.`
请注意，拷贝操作始终需要重新调用 `data` 和 `prepare`。
[link beast.ref.boost__beast__buffers_front `buffers_front`]
[link beast.ref.boost__beast__buffers_front `buffers_front`]
This function converts a beast buffer, that is to be passed by reference, into a buffer reference, that can be passed by value into asio functions.

It implements the __DynamicBuffer__v2__ concept.
该函数用于将通过引用传递的 Beast 缓冲区转换为可通过值传递给 Asio 函数的缓冲区引用。该函数实现了 __DynamicBuffer__v2__ 概念。
Movable
可移动语义
To facilitate working with instances of the __ConstBufferSequence__ and __MutableBufferSequence__ concepts introduced in __Asio__, Beast treats those sequences as a special type of range. The following algorithms and wrappers are provided which transform these ranges efficiently using lazy evaluation. No memory allocations are used in the transformations; instead, they create lightweight iterators over the existing, unmodified memory buffers. Control of buffers is retained by the caller; ownership is not transferred.
为方便处理 __Asio__ 中定义的 __ConstBufferSequence__ 和 __MutableBufferSequence__ 这两种概念，Beast 将它们视为一种特殊的范围类型。该库提供以下算法和包装器，采用延迟求值的方式对这类范围进行高效转换。转换时不会分配内存，只是在已有且未修改的内存缓冲区上创建轻量级迭代器。缓冲区的控制权依然属于调用方，不涉及所有权转移。
This is a more reliable version of [@boost:/doc/html/boost_asio/reference/buffer_size.html `net::buffer_size`] which is easier to use and also works for types which are convertible to `net::const_buffer` or `net::mutable_buffer`.
这是一个更可靠的 `net::buffer_size` 版本，使用起来更简单，并且适用于可转换为 `net::const_buffer` 或 `net::mutable_buffer` 的类型。
This class represents the buffer sequence formed by concatenating two or more buffer sequences. This is type of object returned by [link beast.ref.boost__beast__buffers_cat `buffers_cat`].
该类表示将两个或多个缓冲区序列拼接后形成的新缓冲区序列。该类型与 [link beast.ref.boost__beast__buffers_cat `buffers_cat`] 返回的对象类型一致。
[link beast.ref.boost__beast__buffers_prefix `buffers_prefix`]
[link beast.ref.boost__beast__buffers_prefix `buffers_prefix`]
[link beast.ref.boost__beast__is_const_buffer_sequence `is_const_buffer_sequence`]
[link beast.ref.boost__beast__is_const_buffer_sequence `is_const_buffer_sequence`]
[link beast.ref.boost__beast__is_mutable_buffer_sequence `is_mutable_buffer_sequence`]
[link beast.ref.boost__beast__is_mutable_buffer_sequence `is_mutable_buffer_sequence`]
This metafunction is used to determine if all of the specified types meet the requirements of __MutableBufferSequence__. This type alias will be `std::true_type` if each specified type meets the requirements, otherwise, this type alias will be `std::false_type`.
该元函数用于判断所有指定类型是否都满足 __MutableBufferSequence__ 概念的要求。若每个指定类型都满足要求，则该类型别名为 `std::true_type`；否则为 `std::false_type`。
This function returns a new buffer or buffer sequence which represents a prefix of the original buffers.
该函数用于返回一个代表原始缓冲区前缀的新缓冲区或缓冲区序列。
[link beast.ref.boost__beast__buffers_to_string `buffers_to_string`]
[link beast.ref.boost__beast__buffers_to_string `buffers_to_string`]
This functions returns a new buffer sequence which, when iterated, traverses the sequence which would be formed if all of the input buffer sequences were concatenated. With this routine, multiple calls to a stream's `write_some` function may be combined into one, eliminating expensive system calls.
该函数返回一个新的缓冲区序列，对该序列进行迭代遍历时，其效果相当于将所有输入缓冲区序列拼接在一起。利用该例程，可以将对流 `write_some` 函数的多次调用合并为一次，从而减少昂贵的系统调用。
[link beast.ref.boost__beast__buffer_ref `buffer_ref`] [link beast.ref.boost__beast__ref `ref`]
[link beast.ref.boost__beast__buffer_ref `buffer_ref`] [link beast.ref.boost__beast__ref `ref`]
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描述
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1
 
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no
 
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static
 
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invalidating
 
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yes
 
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dynamic
 
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Description
描述
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Buffer Algorithms and Types
缓冲区算法与类型

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User avatar Bstran

Translation changed
This function returns the first buffer in a buffer sequence, or a buffer of size zero if the buffer sequence has no elements.
This function returns the first buffer in a buffer sequence, or a buffer of size zero if the buffer sequence has no elements.该函数用于返回缓冲区序列中的第一个缓冲区。如果该序列为空，则返回一个大小为零的缓冲区。
06/12/2026
User avatar admin

String added in the repository
This function returns the first buffer in a buffer sequence, or a buffer of size zero if the buffer sequence has no elements.
This function returns the first buffer in a buffer sequence, or a buffer of size zero if the buffer sequence has no elements.
06/05/2026
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String information

Source string description
type: table cell
Unit identifier
58917
Source string location
string ID 21
String age
06/05/2026
Last updated
06/26/2026
Source string age
06/05/2026
Translation file QuickBook file
doc/qbk/03_core/5_buffers_zh_Hans.qbk, string 13