std::make_pair

From cppreference.com

Defined in header `<utility>`

template< class T1, class T2 > std::pair<T1,T2> make_pair( T1 t, T2 u ); template< class T1, class T2 > std::pair<T1,T2> make_pair( T1&& t, T2&& u );		(until C++11) (since C++11)

Creates a std::pair object, deducing the target type from the types of arguments.

The deduced types 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 std::decay results in std::reference_wrapper<X> for some type X, in which case the deduced type is X&. (since C++11)

[edit] Parameters

t, u

-

the values to construct the pair from

[edit] Return value

an std::pair object containing the given values.

[edit] Example

run this code

#include <iostream>
#include <utility>
#include <functional>
 
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 + 1) << ")\n";
}

Output:

The value of p1 is (1, 2)
The value of p2 is (7, 2)

Language
Standard library headers
Concepts
Utilities library
Strings library
Containers library
Algorithms library
Iterators library
Numerics library
Input/output library
Localizations library
Regular expressions library (C++11)
Atomic operations library (C++11)
Thread support library (C++11)