元素元组加法 [英] Element-wise tuple addition

问题描述

我在元组中保存了一些值，并且我希望在元素方面向其添加另一个元组.所以我想要这样的功能:

I have some values held in a tuple, and I am looking to add another tuple to it element-wise. So I would like functionality like this:

std::tuple<int,int> a = {1,2};
std::tuple<int,int> b = {2,4};


std::tuple<int,int> c = a + b; // possible syntax 1
a += b; // possible syntax 2
a += {2,4}; // possible syntax 3

其中输出元组的值为 {3,6}

正在查看 CPP参考，但是我找不到此功能.此和

Was looking at CPP reference, but I couldn't find this functionality. It's possible that this and this question are relevant, however the answers are obfuscated by other complexities.

推荐答案

您还可以考虑使用 std :: valarray ，因为它完全允许您似乎想要的东西.

You could also consider using std::valarray since it allows exactly the things that you seem to want.

#include <valarray>

int main()
{
    std::valarray<int> a{ 1, 2 }, b{ 2, 4 }, c;
    c = a - b; // c is {-1,-2}
    a += b; // a is {3,6}
    a -= b; // a is {1,2} again
    a += {2, 4}; // a is {3,6} again
    return 0;
}

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