< cpp‎ | utility
Member functions
Non-member functions
(until C++20)(until C++20)(until C++20)(until C++20)(until C++20)(C++20)
Deduction guides(C++17)
Helper classes
Defined in header <utility>

    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. A pair is a specific case of a std::tuple with two elements.

If std::is_trivially_destructible_v<T1> && std::is_trivially_destructible_v<T2> is true, the destructor of pair is trivial.

(since C++17)


[edit] Template parameters

T1, T2 - the types of the elements that the pair stores.

[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

constructs new pair
(public member function)
assigns the contents
(public member function)
swaps the contents
(public member function)

[edit] Non-member functions

creates a pair object of type, defined by the argument types
(function template) [edit]
(removed in C++20)(removed in C++20)(removed in C++20)(removed in C++20)(removed in C++20)(C++20)
lexicographically compares the values in the pair
(function template) [edit]
specializes the std::swap algorithm
(function template) [edit]
accesses an element of a pair
(function template) [edit]

[edit] Helper classes

obtains the size of a pair
(class template specialization) [edit]
obtains the type of the elements of pair
(class template specialization) [edit]

[edit] Deduction guides(since C++17)

[edit] See also

implements fixed size container, which holds elements of possibly different types
(class template) [edit]
creates a tuple of lvalue references or unpacks a tuple into individual objects
(function template) [edit]