User avatar Bstran

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Traditionally, programs use a [@boost:/doc/html/boost_asio/reference/steady_timer.html `net::steady_timer`] to determine when a timeout occurs, and then call [@boost:/doc/html/boost_asio/reference/basic_socket/close/overload2.html `close`] on the socket to release the resources. The complexity of managing a separate timer is often a source of [@http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1269r0.html#timers frustration] for non-experts.
Traditionally, programs use a传统做法是，程序使用 [@boost:/doc/html/boost_asio/reference/steady_timer.html `net::steady_timer`] to determine when a timeout occurs, and then call来检测超时，然后调用套接字的 [@boost:/doc/html/boost_asio/reference/basic_socket/close/overload2.html `close`] on the socket to release the resources. The complexity of managing a separate timer is often a source of方法释放资源。对于非专业人士，单独管理一个计时器所带来的复杂性，常常让人感到 [@http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1269r0.html#timers frustration] for non-experts.困扰]。
06/12/2026
User avatar Bstran

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To determine when a peer is offline or idle, a program will implement a [@https://en.wikipedia.org/wiki/Timeout_(computing) timeout] algorithm, which closes the connection after a specified amount of time if some condition is met. For example, if no data is received for the duration. A timeout may be used to:
To determine when a peer is offline or idle, a program will implement a [@https://en.wikipedia.org/wiki/Timeout_(computing) timeout] algorithm, which closes the connection after a specified amount of time if some condition is met. For example, if no data is received for the duration. A timeout may be used to:为了判断对端是否已离线或处于空闲状态，程序需要实现超时算法。该算法会在满足特定条件（例如，在一段时间内未收到任何数据）时关闭连接。超时机制可用于以下场景：
06/12/2026
User avatar Bstran

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Network programs must handle adverse connection conditions; the most common is that a connected peer goes offline unexpectedly. Protocols have no way of identifying this reliably: the peer is offline after all, and unable to send a message announcing the absence. A peer can go offline for various reasons:
Network programs must handle adverse connection conditions; the most common is that a connected peer goes offline unexpectedly. Protocols have no way of identifying this reliably: the peer is offline after all, and unable to send a message announcing the absence. A peer can go offline for various reasons:网络程序必须处理各种不利的连接状况，最常见的情况就是对端意外离线。由于对端已经不在线，自然无法发送消息来告知自身已离线，因此协议本身无法可靠识别这种状态。对端离线的原因有多种可能：
06/12/2026
User avatar Bstran

Translation changed
Timeouts __example__
Timeouts __example超时处理 __示例__
06/12/2026
User avatar Bstran

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Using the type checks with `static_assert` on function or class template types will provide users with helpful error messages and prevent undefined behaviors. This example shows how a template function which writes to a synchronous stream may check its argument:
Using the type checks with `static_assert` on function or class template types will provide users with helpful error messages and prevent undefined behaviors. This example shows how a template function which writes to a synchronous stream may check its argument:在函数或类模板类型上使用 `static_assert` 配合这些类型检查，可以给用户提供更清晰的错误信息，同时避免未定义行为。以下示例展示一个用于向同步流写入数据的模板函数，该示例演示如何对其参数类型进行检查：
06/12/2026
User avatar Bstran

Translation changed
Determine if a type meets the requirements of __SyncWriteStream__.
Determine if a type meets the requirements of用于判断某个类型是否符合 __SyncWriteStream__. 概念的要求。
06/12/2026
User avatar Bstran

Translation changed
[link beast.ref.boost__beast__is_sync_write_stream `is_sync_write_stream`]
[link beast.ref.boost__beast__is_sync_write_stream `is_sync_write_stream`] —— 用于判断某个类型是否符合 __SyncWriteStream__ 概念的要求。
06/12/2026
User avatar Bstran

Translation changed
[link beast.ref.boost__beast__is_sync_write_stream `is_sync_write_stream`]
[link beast.ref.boost__beast__is_sync_write_stream `is_sync_write_stream`] —— 用于判断某个类型是否符合 __SyncWriteStream__ 概念的要求。
06/12/2026
User avatar Bstran

Translation changed
Determine if a type meets the requirements of both __SyncReadStream__ and __SyncWriteStream__.
Determine if a type meets the requirements of both用于判断某个类型是否同时符合 __SyncReadStream__ and与 __SyncWriteStream__. 概念的要求。
06/12/2026
User avatar Bstran

Translation changed
[link beast.ref.boost__beast__is_sync_stream `is_sync_stream`]
[link beast.ref.boost__beast__is_sync_stream `is_sync_stream`]
06/12/2026
User avatar Bstran

Translation changed
Determine if a type meets the requirements of __SyncReadStream__.
Determine if a type meets the requirements of用于判断某个类型是否符合 __SyncReadStream__. 概念的要求。
06/12/2026
User avatar Bstran

Translation changed
[link beast.ref.boost__beast__is_sync_read_stream `is_sync_read_stream`]
[link beast.ref.boost__beast__is_sync_read_stream `is_sync_read_stream`]
06/12/2026
User avatar Bstran

Translation changed
Determine if a type meets the requirements of __AsyncWriteStream__.
Determine if a type meets the requirements of用于判断某个类型是否符合 __AsyncWriteStream__. 概念的要求。
06/12/2026
User avatar Bstran

Translation changed
[link beast.ref.boost__beast__is_async_write_stream `is_async_write_stream`]
[link beast.ref.boost__beast__is_async_write_stream `is_async_write_stream`]
06/12/2026
User avatar Bstran

Translation changed
Determine if a type meets the requirements of both __AsyncReadStream__ and __AsyncWriteStream__.
Determine if a type meets the requirements of both用于判断某个类型是否同时符合 __AsyncReadStream__ and与 __AsyncWriteStream__. 概念的要求。
06/12/2026
User avatar Bstran

Translation changed
[link beast.ref.boost__beast__is_async_stream `is_async_stream`]
[link beast.ref.boost__beast__is_async_stream `is_async_stream`]
06/12/2026
User avatar Bstran

Translation changed
Determine if a type meets the requirements of __AsyncReadStream__.
Determine if a type meets the requirements of用于判断某个类型是否符合 __AsyncReadStream__. 概念的要求。
06/12/2026
User avatar Bstran

Translation changed
[link beast.ref.boost__beast__is_async_read_stream `is_async_read_stream`]
[link beast.ref.boost__beast__is_async_read_stream `is_async_read_stream`]
06/12/2026
User avatar Bstran

Translation changed
Determine if the `get_executor` member function is present.
Determine if the `get_executor` member function is present.用于判断是否存在 `get_executor` 成员函数。
06/12/2026
User avatar Bstran

Translation changed
[link beast.ref.boost__beast__has_get_executor `has_get_executor`]
[link beast.ref.boost__beast__has_get_executor `has_get_executor`]
06/12/2026

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