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[link beast.ref.boost__beast__async_base `async_base`] [link beast.ref.boost__beast__stable_async_base `stable_async_base`]
[link beast.ref.boost__beast__async_base `async_base`] [link beast.ref.boost__beast__stable_async_base `stable_async_base`]
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Description
Description描述
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Name
Name名称
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Asynchronous Helpers
Asynchronous Helpers异步辅助函数
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Authors using Beast can reuse the library's primitives to create their own initiating functions for performing a series of other, intermediate asynchronous operations before invoking a final completion handler. The set of intermediate actions produced by an initiating function is known as a [@http://blog.think-async.com/2009/08/composed-operations-coroutines-and-code.html ['composed operation]]. To ensure full interoperability and well-defined behavior, __Asio__ imposes requirements on the implementation of composed operations. These classes and functions make it easier to develop initiating functions and their composed operations:
Authors using Beast can reuse the library's primitives to create their own initiating functions for performing a series of other, intermediate asynchronous operations before invoking a final completion handler. The set of intermediate actions produced by an initiating function is known as a [@http://blog.think-async.com/2009/08/composed-operations-coroutines-and-code.html ['composed operation]]. To ensure full interoperability and well-defined behavior, __Asio__ imposes requirements on the implementation of composed operations. These classes and functions make it easier to develop initiating functions and their composed operations:使用 Beast 的开发者可以复用库中的基本组件，来创建自己的发起函数。这些发起函数会在执行一系列中间异步操作之后，最终调用一个完成处理器。发起函数所产生的这一系列中间动作，被称为 [组合操作]。为确保良好的互操作性和行为的一致性，__Asio__ 对组合操作的实现方式提出了一些要求。以下提供的类和函数，可以帮助开发者更轻松地编写发起函数及其对应的组合操作：
06/12/2026
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This initiating function receives the dynamic buffer by lvalue-reference,
This initiating function receives the dynamic buffer by lvalue-reference,该发起函数通过左值引用接收动态缓冲区，
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Asynchronous operations are started by calling a free function or member function known as an asynchronous ['__async_initfn__]. This function accepts parameters specific to the operation as well as a __CompletionToken__. The token is either a completion handler, or a type defining how the caller is informed of the asynchronous operation result. Networking provides the special tokens __use_future__ and __yield_context__ for using futures and coroutines respectively. This system of customizing the return value and method of completion notification is known as the ['Universal Asynchronous Model] described in __N3747__, and a built in to __NetTS__. Here is an example of an initiating function which reads a line from the stream and echoes it back. This function is developed further in the next section:
Asynchronous operations are started by calling a free function or member function known as an asynchronous ['__async_initfn__]. This function accepts parameters specific to the operation as well as a __CompletionToken__. The token is either a completion handler, or a type defining how the caller is informed of the asynchronous operation result. Networking provides the special tokens异步操作通过调用一个自由函数或成员函数来启动，该函数被称为异步[发起函数]。发起函数接收操作相关的参数以及一个 __CompletionToken__ 完成令牌。该令牌可以是一个完成处理器，也可以是一种用于定义调用方如何获知异步操作结果的方式。网络库提供 __use_future__ and和 __yield_context__ for using futures and coroutines respectively. This system of customizing the return value and method of completion notification is known as the ['Universal Asynchronous Model] described in __N3747__, and a built in to __NetTS__. Here is an example of an initiating function which reads a line from the stream and echoes it back. This function is developed further in the next section:这两种特殊令牌，分别用于支持 future 和协程。这种自定义返回值及完成通知方式的机制被称为 __N3747__ 中描述的通用异步模型，并已内置到 __NetTS__ 中。以下是一个发起函数的示例，该函数用于从流中读取一行数据并将其回显回去。下一节将进一步开发此函数：
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Writing Composed Operations
Writing Composed Operations编写组合操作
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For POSIX systems, this class provides a suitable implementation of __File__ which wraps the native file descriptor and provides it if necessary.
For对于 POSIX systems, this class provides a suitable implementation of __File__ which wraps the native file descriptor and provides it if necessary.系统，该类提供合适的 __File__ 实现，它封装原生文件描述符，并在必要时提供该描述符。
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[link beast.ref.boost__beast__file_posix `file_posix`]
[link beast.ref.boost__beast__file_posix `file_posix`]
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This implements a __File__ for the Win32 API. It provides low level access to the native file handle when necessary.
This implements a __File__ for the Win32 API. It provides low level access to the native file handle when necessary.该实现为 Win32 API 提供 __File__ 接口。必要时，它可以提供对原生文件句柄的低级别访问。
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[link beast.ref.boost__beast__file_win32 `file_win32`]
[link beast.ref.boost__beast__file_win32 `file_win32`]
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This implementation of __File__ uses the C++ standard library facilities obtained by including `<cstdio>`.
This implementation of __File__ uses the C++ standard library facilities obtained by including该 __File__ 实现使用 C++ 标准库的功能，这些功能通过包含 `<cstdio>`. 头文件获得。
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[link beast.ref.boost__beast__file_stdio `file_stdio`]
[link beast.ref.boost__beast__file_stdio `file_stdio`]
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`file` is a type alias to one of the following implementations, depending on what is available on the target platform.
`file` is a type alias to one of the following implementations, depending on what is available on the target platform.是一个类型别名，其具体类型取决于目标平台所支持的实现，可能为以下某种实现之一：
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[link beast.ref.boost__beast__file `file`]
[link beast.ref.boost__beast__file `file`]
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Description
Description描述
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Name
Name名称
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