使用C++20的协程实现自定义异步函数是一种更好的方式,因为它可以使异步代码更易于编写和理解。下面是一个使用Boost.Asio和C++20协程的示例:
#include
#include
#include
#include
#include
namespace asio = boost::asio;
using asio::ip::tcp;
asio::awaitable async_read(asio::ip::tcp::socket& socket) {
try {
char data[1024];
asio::mutable_buffer buffer = asio::buffer(data, sizeof(data));
size_t len = co_await socket.async_read_some(buffer, asio::use_awaitable);
co_return std::string(data, len);
} catch (const std::exception& ex) {
std::cerr << "read error: " << ex.what() << std::endl;
throw;
}
}
asio::awaitable async_write(asio::ip::tcp::socket& socket, const std::string& message) {
try {
asio::const_buffer buffer = asio::buffer(message.data(), message.size());
co_await asio::async_write(socket, buffer, asio::use_awaitable);
} catch (const std::exception& ex) {
std::cerr << "write error: " << ex.what() << std::endl;
throw;
}
}
asio::awaitable async_echo(tcp::socket socket) {
try {
while(true) {
std::string message = co_await async_read(socket);
co_await async_write(socket, message);
}
} catch (const std::exception& ex) {
std::cerr << "error: " << ex.what() << std::endl;
}
}
int main() {
asio::io_context io_context(1);
tcp::acceptor acceptor(io_context, tcp::endpoint(tcp::v4(), 1234
上一篇:Asio错误:“I/o操作已被中止,因为线程退出或应用程序请求”。
下一篇:asio的associated_allocator、associated_executor和associated_cancellation_slot用于什么?如何使用它们?