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std::get(std::pair) - cppreference.com
(1) (since C++11)
(constexpr since C++14) (2) (since C++11)
(constexpr since C++14) (3) (since C++11)
(constexpr since C++14) (4) (since C++11)
(constexpr since C++14) template< class T, class U >
constexpr T& get( std::pair<T, U>& p ) noexcept; (5) (since C++14) template< class T, class U >
constexpr const T& get( const std::pair<T, U>& p ) noexcept; (6) (since C++14) template< class T, class U >
constexpr T&& get( std::pair<T, U>&& p ) noexcept; (7) (since C++14) template< class T, class U >
constexpr const T&& get( const std::pair<T, U>&& p ) noexcept; (8) (since C++14) template< class T, class U >
constexpr T& get( std::pair<U, T>& p ) noexcept; (9) (since C++14) template< class T, class U >
constexpr const T& get( const std::pair<U, T>& p ) noexcept; (10) (since C++14) template< class T, class U >
constexpr T&& get( std::pair<U, T>&& p ) noexcept; (11) (since C++14) template< class T, class U >
constexpr const T&& get( const std::pair<U, T>&& p ) noexcept; (12) (since C++14)
Extracts an element from the pair using tuple-like interface.
1-4) The index-based overloads fail to compile if the index I is neither â0â nor 1.
5-12) The type-based overloads fail to compile if the types T and U are the same.
[edit] Parameters p - pair whose contents to extract [edit] Return value
1-4) Returns a reference to p.first if I == 0 and a reference to p.second if I == 1.
5-8) Returns a reference to p.first.
9-12) Returns a reference to p.second.
[edit] Example
#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";
std::cout << '(' << std::get<int>(p) << ", " << std::get<double>(p) << ")\n";
}
Output:
[edit] Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR Applied to Behavior as published Correct behavior LWG 2485 C++11 (by index)
C++14 (by type) there are no overloads for const pair&& the overloads are added [edit] See also
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