std::get(std::pair)

 

C++

Language

Standard library headers

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Utilities library

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Numerics library

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Regular expressions library (C++11)

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Thread support library (C++11)

 

Utilities library

Type support (basic types, RTTI, type traits)

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Function objects

initializer_list (C++11)

bitset

hash (C++11)

Relational operators

rel_ops::operator!= rel_ops::operator> rel_ops::operator<= rel_ops::operator>=

Pairs and tuples

pair

tuple (C++11)

piecewise_construct_t (C++11)

piecewise_construct (C++11)

Swap, forward and move

swap

forward (C++11)

move (C++11)

move_if_noexcept (C++11)

declval (C++11)

 

std::pair

Member functions

pair::pair

pair::operator=

pair::swap

Non-member functions

make_pair

operator= operator!= operator< operator<= operator> operator>=

std::swap

get (C++11)

Helper classes

tuple_size (C++11)

tuple_element (C++11)

 

template< size_t N, class T1, class T2 > typename std::tuple_element<I, std::pair<T1,T2> >::type&     get( pair<T1, T2>& p );	(1)	(since C++11)
template< size_t N, class T1, class T2 > const typename std::tuple_element<I, std::pair<T1,T2> >::type&     get( const pair<T1,T2>& p );	(2)	(since C++11)
template< size_t N, class T1, class T2 > typename std::tuple_element<I, std::pair<T1,T2> >::type&&     get( std::pair<T1,T2>&& p );	(3)	(since C++11)

Extracts a element from the pair using tuple-like interface.

Parameters

p

-

pair whose contents to extract

Return value

1-2) Returns p.first if N==0 and p.second if N==1.

3) Returns std::forward<T1&&>(p.first) if N==0 and std::forward<T2&&>(p.second) if N==1

Exceptions

1-3)

noexcept specification:  

noexcept

  (since C++11)

Example

run this code

#include <iostream>
#include <utility>
 
int main()
{
    auto p = std::make_pair(1, 3.14);
    std::cout << '(' << std::get<0>(p) << ", " << std::get<1>(p) << ")\n";
}

Output:

(1, 3.14)

See also

std::get(std::tuple)	tuple accesses specified element (function template)
std::get(std::array)	accesses an element of an array (function template)