deduction guides for std::pair

Defined in header <utility>
template<class T1, class T2>
pair(T1, T2) -> pair<T1, T2>;
(since C++17)

One deduction guide is provided for std::pair to account for the edge cases missed by the implicit deduction guides.

In particular, non-copyable arguments and array to pointer conversion.


#include <utility>
int main()
    int a[2], b[3];
    std::pair p{a, b}; // explicit deduction guide is used in this case

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