Index-based assignment in the loop for Pair, C++

Question

I am new to C++. I want to assign the values to my tuple inside the loop. The following does not work.

#include<utility>

std::pair<int, int> myPair;

int main() {
    for(int i=0; i<2; i++) {
        std::get<i>(myPair) = i;
    }
}

How could I do it correctly?

Answer 1

Do you have a reason to insist on doing this in a loop? If not, you can just assign to mypair.first and mypair.second.

#include<utility>

std::pair<int, int> myPair;

int main() {
    myPair.first = 1;
    myPair.second = 2;
}

A very useful website to check what's available for standard library types is cppreference.com

Maybe you actually want a std::vector?

#include <vector>

int get_next_value(int); // Not defined in this example.
// You get your values from somewhere...

// note that global variables like this might not be the best idea.
std::vector<int> values; 

int main() {
    for (int i=0; i < 2; ++i) {
        values.push_back(get_next_value(i));
    }
}