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std::make_pair(3) C++ Standard Libary std::make_pair(3) NAME std::make_pair - std::make_pair Synopsis Defined in header <utility> template< class T1, class T2 > (until C++11) std::pair<T1, T2> make_pair( T1 t, T2 u ); template< class T1, class T2 > (since C++11) std::pair<V1, V2> make_pair( T1&& t, T2&& u ); (constexpr since C++14) Creates a std::pair object, deducing the target type from the types of arguments. The deduced types V1 and V2 are std::decay<T1>::type and std::decay<T2>::type (the usual type transformations applied to arguments of functions passed by value) unless application of (since C++11) std::decay results in std::reference_wrapper<X> for some type X, in which case the deduced type is X&. Parameters t, u - the values to construct the pair from Return value A std::pair object containing the given values. Example // Run this code #include <functional> #include <iostream> #include <utility> int main() { int n = 1; int a[5] = {1, 2, 3, 4, 5}; // build a pair from two ints auto p1 = std::make_pair(n, a[1]); std::cout << "The value of p1 is " << '(' << p1.first << ", " << p1.second << ")\n"; // build a pair from a reference to int and an array (decayed to pointer) auto p2 = std::make_pair(std::ref(n), a); n = 7; std::cout << "The value of p2 is " << '(' << p2.first << ", " << *(p2.second + 2) << ")\n"; } Output: The value of p1 is (1, 2) The value of p2 is (7, 3) Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Correct behavior LWG 181 C++98 the parameter types were const-reference changed these types, which made passing arrays impossible types to value types http://cppreference.com 2024.06.10 std::make_pair(3)
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