2403C++,C++20协程通道

原文
通道是一个可用来连接协程,实现不同协程间通信的并发安全队列.

@Test
fun `test know channel`() = runBlocking<Unit> {val channel = Channel<Int>()//生产者val producer = GlobalScope.launch {var i = 0while (true) {delay(1000)channel.send(++i)println("send $i")}}//消费者val consumer = GlobalScope.launch {while (true) {val element = channel.receive()println("receive $element")}}joinAll(producer, consumer)
}

该示例很简单,生产者协程和消费者协程通过通道通信.

C++20协程有通道吗?与go和kotlin那样的通道.
答案是:有,就在yalantinglibs的coro_io里面.

来看看C++20协程通道的用法:

  auto executor = coro_io::get_global_block_executor()->get_asio_executor();asio::experimental::channel<void(std::error_code, int)> channel(executor, 1000);co_await coro_io::async_send(ch, 42);auto [ec, val] = co_await coro_io::async_receive<int>(channel);assert(val == 42);

创建了个容量为1000的通道,后续就可通过该通道实现协程间通信了.
这就是C++20协程通道,用法和go,kotlin的通道类似.