How do I use in constexpr contexts std::pair in C++?

In C++, the std::pair can be utilized in constexpr contexts starting from C++11. This allows you to create compile-time constant pairs that can be used in template metaprogramming and other compile-time constructs. Here's how you can use std::pair in a constexpr context:


        #include <utility>

        constexpr std::pair createPair(int a, double b) {
            return std::pair(a, b);
        }

        constexpr auto myPair = createPair(1, 2.5);

        constexpr int first = myPair.first;   // first is 1
        constexpr double second = myPair.second; // second is 2.5