C++中怎么实现异步操作

C++中怎么实现异步操作，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。

实现(代码)

#include <iostream> #include <vector> #include <algorithm> #include <future>  template <typename RAIter> int parallel_sum(RAIter front, RAIter beg, RAIter end) {     auto len = end - beg;     if (len < 1000)     {         char out[50];         sprintf(out, "Calculate from %d to %d\n", beg - front, end - front);         std::cout << out;         return std::accumulate(beg, end, 0);     }      RAIter mid = beg + len / 2;     auto handle_right = std::async(std::launch::async,                              parallel_sum<RAIter>, front, mid, end);     auto handle_left = std::async(std::launch::async,                              parallel_sum<RAIter>, front, beg, mid);     return handle_left.get() + handle_right.get(); }  int main() {     std::vector<int> v(20000, 1);     std::cout << "The sum is " << parallel_sum(v.begin(), v.begin(), v.end()) << '\n'; }

输出

可能一

Calculate from 8125 to 8750                                                                                                                Calculate from 18125 to 18750                                                                                                              Calculate from 10625 to 11250                                                                                                              Calculate from 2500 to 3125                                                                                                                Calculate from 13750 to 14375                                                                                                              Calculate from 5000 to 5625                                                                                                                Calculate from 1250 to 1875                                                                                                                Calculate from 3750 to 4375                                                                                                                Calculate from 16250 to 16875                                                                                                              Calculate from 17500 to 18125                                                                                                              Calculate from 10000 to 10625                                                                                                              Calculate from 625 to 1250                                                                                                                 Calculate from 18750 to 19375                                                                                                              Calculate from 15625 to 16250                                                                                                              Calculate from 3125 to 3750                                                                                                                Calculate from 12500 to 13125                                                                                                              The sum is 20000

可能二

Calculate from 1875 to 2500 Calculate from 3750 to 4375  Calculate from 8750 to 9375  Calculate from 7500 to 8125  Calculate from 15000 to 15625  Calculate from 10000 to 10625  Calculate from 1250 to 1875  Calculate from 6875 to 7500  Calculate from 0 to 625 Calculate from 3125 to 3750  Calculate from 5625 to 6250  Calculate from 5000 to 5625  Calculate from 6250 to 6875  Calculate from 2500 to 3125  The sum is 20000

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