coroutin_with_asio.cpp

void coroutine_executor() {
    reenter(this) {
        std::cout<<"before yield 1"<<std::endl;                                               
        yield task_thread_pool_.post_task([&](){ 
            std::cout<<"yield 1"<<std::endl;
            coroutine_executor(); 
        });

        std::cout<<"after yield 1"<<std::endl;
        yield task_thread_pool_.post_task([&](){ 
            std::cout<<"yield 2"<<std::endl;
            coroutine_executor(); 
        });
    } 
}