C++Future简单的使用

C++Future简单的使用,参考c++并发编程指南

#include "stdafx.h"#include <thread>#include <iostream>#include <vector>#include <algorithm>#include <map>#include <mutex>#include <stack>#include <string>#include <exception>#include <memory> // For std::shared_ptr<>#include <queue>#include <condition_variable>#include <atomic>#include <future>using namespace std;int Add(){    cout << "Future add exe!" << endl;    return 1;}int Sum(int a, int b){    return a + b;}struct MySum{    int Sum(int a, int b){ return a + b; }};int _tmain(int argc, _TCHAR* argv[]){    std::future<int> the_answer = std::async(std::launch::async/*std::launch::deferred*/, Add);    // 通过延时来看期望的两个选项的差异(std::launch::async --- 异步线程执行,std::launch::deferred --- 延时执行)    this_thread::sleep_for(chrono::seconds(10));    std::cout << "The answer is " << the_answer.get() << std::endl;    std::future<int> the_sum = std::async(Sum, 1, 2);    std::cout << "The Sum is " << the_sum.get() << std::endl;    MySum TheStructSum;    std::future<int> StructSum = std::async(&MySum::Sum, TheStructSum, 3, 4);    std::cout << "The Struct Sum is " << StructSum.get() << std::endl;    return 0;}