std::pair

From Cppreference

C++ Standard Library
Language 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)
Utilities library
Type support (basic types, RTTI, type traits) Dynamic memory management Error handling Program utilities Variadic functions Date and time 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)

Defined in header <utility>
template<     class T1,     class T2 > struct pair;

std::pair is a struct template that provides a way to store two heterogeneous objects as a single unit.

Contents 1 Member types 2 Member objects 3 Member functions 4 Non-member functions 5 Helper classes

[edit] Member types

Member type	Definition
first_type	T1
second_type	T2

[edit] Member objects

Member name	Type
first	T1
second	T2

[edit] Member functions

(constructor)	constructs new pair (public member function)
operator=	assigns the contents (public member function)
swap (C++11)	swaps the contents (public member function)

[edit] Non-member functions

make_pair	creates a pair object of type, defined by the argument types (function template)
operator== operator!= operator< operator<= operator> operator>=	lexicographically compares the values in the pair (function template)
std::swap(std::pair) (C++11)	specializes the std::swap algorithm (function template)
std::get(std::pair) (C++11)	(function template)

[edit] Helper classes

std::tuple_size<std::pair> (C++11)	obtains the size of a pair (class template specialization)
std::tuple_element<std::pair> (C++11)	obtains the type of the elements of pair (class template specialization)