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* [link beast.ref.boost__beast__http__is_body `is_body`]
* __BodyReader__
* __BodyWriter__
* [link beast.ref.boost__beast__http__is_body `is_body`]
* __BodyReader__
* __BodyWriter__
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Associated Types
Associated Types关联类型
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A [*Body] type is supplied as a template argument to the __message__ class. It controls both the type of the data member of the resulting message object, and the algorithms used during parsing and serialization.
A [*Body] type is supplied as a template argument to the __message__ class. It controls both the type of the data member of the resulting message object, and the algorithms used during parsing and serialization.类型作为模板参数传递给 __message__ 类。它决定结果消息对象中数据成员的类型，以及解析和序列化所用算法。
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Body
Body消息体
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This section describes all of the concepts defined by the library.
This section describes all of the concepts defined by the library.本节介绍该库定义的所有概念。
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Concepts
Concepts概念
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The implementation uses composed asynchronous operations; although some individual operations can perform both reads and writes, this behavior is coordinated internally to make sure the underlying stream is operated in a safe fashion. This allows an asynchronous read operation to respond to a received ping frame even while a user-initiated call to asynchronous write is active.
The implementation uses composed asynchronous operations; although some individual operations can perform both reads and writes, this behavior is coordinated internally to make sure the underlying stream is operated in a safe fashion. This allows an asynchronous read operation to respond to a received ping frame even while a user-initiated call to asynchronous write is active.实现使用组合异步操作。虽然某些操作可能同时涉及读取和写入，但内部会协调这些行为，确保底层流安全运行。因此，即使有用户发起的异步写入操作正在进行，异步读取操作也能正常响应收到的 ping 帧。
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However, this code is correct:
However, this code is correct:然而，以下代码是正确的：
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For example, the following code is produces undefined behavior, because the program is attempting to perform two simultaneous reads:
For example, the following code is produces undefined behavior, because the program is attempting to perform two simultaneous reads:例如，以下代码会导致未定义行为，因为程序试图同时执行两个读取操作：
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* [link beast.ref.boost__beast__websocket__stream.async_read `async_read`] or [link beast.ref.boost__beast__websocket__stream.async_read_some `async_read_some`]
* [link beast.ref.boost__beast__websocket__stream.async_write `async_write`] or [link beast.ref.boost__beast__websocket__stream.async_write_some `async_write_some`]
* [link beast.ref.boost__beast__websocket__stream.async_ping `async_ping`] or [link beast.ref.boost__beast__websocket__stream.async_pong `async_pong`]
* [link beast.ref.boost__beast__websocket__stream.async_close `async_close`]
* [link beast.ref.boost__beast__websocket__stream.async_read `async_read`] or [link beast.ref.boost__beast__websocket__stream.async_read_some `async_read_some`]
* [link beast.ref.boost__beast__websocket__stream.async_write `async_write`] or [link beast.ref.boost__beast__websocket__stream.async_write_some `async_write_some`]
* [link beast.ref.boost__beast__websocket__stream.async_ping `async_ping`] or [link beast.ref.boost__beast__websocket__stream.async_pong `async_pong`]
* [link beast.ref.boost__beast__websocket__stream.async_close `async_close`]
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Like a regular __Asio__ socket, a [link beast.ref.boost__beast__websocket__stream `stream`] is not thread safe. Callers are responsible for synchronizing operations on the socket using an implicit or explicit strand, as per the Asio documentation. The websocket stream asynchronous interface supports one of each of the following operations to be active at the same time:
Like a regular __Asio__ socket, a 与普通的 Asio 套接字类似，[link beast.ref.boost__beast__websocket__stream `stream`] is not thread safe. Callers are responsible for synchronizing operations on the socket using an implicit or explicit strand, as per the Asio documentation. The webs不是线程安全的。调用方需要按照 Asio 文档的要求，使用隐式或显式的串行器来同步套接字操作。WebSocket stream asynchronous interface supports one of each of the following operations to be active at the same time:流的异步接口支持以下各类操作同时各有一个处于活动状态：
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Thread Safety
Thread Safety线程安全性
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The creation and operation of the __io_context__ associated with the underlying stream is left to the callers, permitting any implementation strategy including one that does not require threads for environments where threads are unavailable. Beast WebSocket itself does not use or require threads.
The creation and operation of the __io_context__ associated with the underlying stream is left to the callers, permitting any implementation strategy including one that does not require threads for environments where threads are unavailable. Beast WebSocket itself does not use or require threads.与底层流关联的 __io_context__ 的创建和操作由调用方负责，允许采用任何实现策略，包括在无线程环境中不需要线程的策略。Beast WebSocket 本身不使用也不要求线程。
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The io_context
The io_contextI/O 上下文对象
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The example programs that come with the library demonstrate the usage of websocket stream operations with all asynchronous varieties.
The example programs that come with the library demonstrate the usage of webs库附带的示例程序展示了 WebSocket stream operations with all asynchronous varieties.流操作在所有异步变体中的用法。
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Calls to asynchronous initiation functions support the extensible asynchronous model developed by the Boost.Asio author, allowing for traditional completion handlers, stackful or stackless coroutines, and even futures:
Calls to asynchronous initiation functions support the extensible asynchronous model developed by the Boost.Asio author, allowing for traditional completion handlers, stackful or stackless coroutines, and even对异步发起函数的调用支持 Boost.Asio 作者开发的可扩展异步模型，允许使用传统的完成处理器、有栈或无栈协程，甚至 futures:：
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