c++11使用 async异步函数并传递参数以及auto的使用方法

class X{public:int foo(int a,std::string const& b){std::cout<<a<<std::endl<<b<<std::endl;return 3;}std::string bar(std::string const& a){std::cout<<a<<std::endl;return a;}};

<pre name="code" class="cpp">X x;//传入x是传入x的副本auto f1 = std::async(&X::foo,x,1,"hello");//传入&x\std::ref(x)是传入x的引用//std::future<int> f2 = std::async(&X::bar,&x,"hi");auto f2 = std::async(&X::bar,&x,"hi");auto f3 = std::async(&X::bar,std::ref(x),"hi");std::cout<<f2.get()<<std::endl;std::cout<<f1.get()<<std::endl;std::cout<<f3.get()<<std::endl;