自己实现的基于FSM的coroutine

self_coroutine.cpp

#define begin() \
    static unsigned int state_ = 0;\
    switch (state_) \
    case 0: 

#define _yield_impl(x_, z_) \                                                                 
    do { \
        state_ = z_; \
        ##x_; \
    goto exit__;\
    case z_:;\
    } while (false)

#define _yield(y_) \
    _yield_impl(y_, __COUNTER__ +1)

#define end() \
    default:\
exit__:\
    break

    void coroutine_executor_yy() {
        begin() {
            _yield(task_thread_pool_.post_task([&](){
                std::cout<<"yy ******yield***** 1"<<std::endl;
                coroutine_executor_yy(); 
            }));
            

            _yield(task_thread_pool_.post_task([&](){ 
                std::cout<<"yy ****yield**** 2"<<std::endl;
                coroutine_executor_yy(); 
            }));

            end();
        }     
    }