C++ 中的并行循环

2021-12-11 00:00:00 for-loop concurrency c++ c++11 c++14

我想知道是否有一种简单直接的方法可以在 C++ 中并行计算诸如 for 和基于范围的 for 循环之类的循环.你会如何实施这样的事情?我从 Scala 知道 map、filter 和 foreach 函数，也许也可以并行执行这些函数?有没有一种简单的方法可以在 C++ 中实现这一点?

I wonder if there is a light, straight forward way to have loops such as for and range based-for loops compute in parallel in C++. How would you implement such a thing? From Scala I know the map, filter and foreach functions and maybe it would also be possible to perform these in parallel? Is there an easy way to achieve this in C++?

我的主要平台是 Linux，但如果它可以跨平台工作就好了.

My primary platform is Linux, but it would be nice if it worked cross-platform.

推荐答案

借助 C++17 中的并行算法，我们现在可以使用:

With the parallel algorithms in C++17 we can now use:

std::vector<std::string> foo;
std::for_each(
    std::execution::par_unseq,
    foo.begin(),
    foo.end(),
    [](auto&& item)
    {
        //do stuff with item
    });

并行计算循环.第一个参数指定执行策略

to compute loops in parallel. The first parameter specifies the execution policy

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