clang的一个bug导致when_all/any代码可能编译失败。

不得已更换切换调度器的写法。

librf/src/switch_scheduler.h

 		scheduler_t* _scheduler;
 	};
 
-	inline switch_scheduler_awaitor operator co_await(scheduler_t& sch)
+	//由于跟when_all/when_any混用的时候，在clang上编译失败：
+	//clang把scheduler_t判断成一个is_awaitable，且放弃选择when_all/any(scheduler_t& sch, ...)版本
+	//故放弃这种用法
+	//inline switch_scheduler_awaitor operator co_await(scheduler_t& sch) noexcept
+	//{
+	//	return { &sch };
+	//}
+	inline switch_scheduler_awaitor via(scheduler_t& sch) noexcept
 	{
 		return { &sch };
 	}
+	inline switch_scheduler_awaitor via(scheduler_t* sch) noexcept
+	{
+		return { sch };
+	}
+
 }

tutorial/test_async_switch_scheduler.cpp

 	std::cout << ", scheduler = " << current_scheduler();
 	std::cout << ", value = " << val << std::endl;
 
-	co_await *sch_in_thread;
+	co_await via(sch_in_thread);
 	val = co_await async_get_long_switch_scheduler(val);
 
 	std::cout << "thread = " << std::this_thread::get_id();
 	std::cout << ", scheduler = " << current_scheduler();
 	std::cout << ", value = " << val << std::endl;
 
-	co_await *sch_in_main;
+	co_await via(sch_in_main);
 	val = co_await async_get_long_switch_scheduler(val);
 
 	std::cout << "thread = " << std::this_thread::get_id();
 	std::cout << ", scheduler = " << current_scheduler();
 	std::cout << ", value = " << val << std::endl;
 
-	co_await *sch_in_thread;
+	co_await via(sch_in_thread);
 	val = co_await async_get_long_switch_scheduler(val);
 
 	std::cout << "thread = " << std::this_thread::get_id();
 	std::cout << ", scheduler = " << current_scheduler();
 	std::cout << ", value = " << val << std::endl;
 
-	co_await *sch_in_thread;	//fake switch
+	co_await via(sch_in_thread);	//fake switch
 	val = co_await async_get_long_switch_scheduler(val);
 
 	std::cout << "thread = " << std::this_thread::get_id();