Function session

demo_example/async_echo_server.cpp:23–48

using asio::ip::tcp;

async_simple::coro::Lazy<void> session(tcp::socket sock) {
    int msg_index = 0;
    for (;;) {
        const size_t max_length = 1024;
        char data[max_length];
        auto [error, length] =
            co_await async_read_some(sock, asio::buffer(data, max_length));
        msg_index++;
        if (error == asio::error::eof) {
            std::cout << "Remote client closed at message index: "
                      << msg_index - 1 << ".\n";
            break;
        } else if (error) {
            std::cout << error.message() << '\n';
            throw asio::system_error(error);
        }

        co_await async_write(sock, asio::buffer(data, length));
    }

    std::error_code ec;
    sock.shutdown(asio::ip::tcp::socket::shutdown_both, ec);
    sock.close(ec);

    std::cout << "Finished echo message, total: " << msg_index - 1 << ".\n";
}

async_simple::coro::Lazy<void> start_server(asio::io_context& io_context,
                                            unsigned short port,