std::pair - Man Page

Struct holding two objects of arbitrary type.

Synopsis

Inherits __pair_base< _T1, _T2 >.

Public Types

typedef _T1 first_type
The type of the first member.
typedef _T2 second_type
The type of the second member.

Public Member Functions

template<typename _U1  = _T1, typename _U2  = _T2, typename enable_if< __and_< __is_implicitly_default_constructible< _U1 >, __is_implicitly_default_constructible< _U2 >> ::value, bool >::type  = true> constexpr pair ()
template<typename _U1 , typename _U2 , typename enable_if< _PCCP::template _MoveConstructiblePair< _U1, _U2 >() &&_PCCP::template _ImplicitlyMoveConvertiblePair< _U1, _U2 >(), bool >::type  = true> constexpr pair (_U1 &&__x, _U2 &&__y)
template<typename _U1 , typename _U2 , typename enable_if< _PCCP::template _MoveConstructiblePair< _U1, _U2 >() &&!_PCCP::template _ImplicitlyMoveConvertiblePair< _U1, _U2 >(), bool >::type  = false> constexpr pair (_U1 &&__x, _U2 &&__y)
template<typename _U1 , typename enable_if< _PCCP::template _MoveCopyPair< true, _U1, _T2 >(), bool >::type  = true> constexpr pair (_U1 &&__x, const _T2 &__y)
template<typename _U1 , typename enable_if< _PCCP::template _MoveCopyPair< false, _U1, _T2 >(), bool >::type  = false> constexpr pair (_U1 &&__x, const _T2 &__y)
template<typename _U1  = _T1, typename _U2  = _T2, typename enable_if< _PCCP::template _ConstructiblePair< _U1, _U2 >() &&_PCCP::template _ImplicitlyConvertiblePair< _U1, _U2 >(), bool >::type  = true> constexpr pair (const _T1 &__a, const _T2 &__b)
Construct from two const lvalues, allowing implicit conversions.
template<typename _U1  = _T1, typename _U2  = _T2, typename enable_if< _PCCP::template _ConstructiblePair< _U1, _U2 >() &&!_PCCP::template _ImplicitlyConvertiblePair< _U1, _U2 >(), bool >::type  = false> constexpr pair (const _T1 &__a, const _T2 &__b)
Construct from two const lvalues, disallowing implicit conversions.
template<typename _U2 , typename enable_if< _PCCP::template _CopyMovePair< true, _T1, _U2 >(), bool >::type  = true> constexpr pair (const _T1 &__x, _U2 &&__y)
template<typename _U2 , typename enable_if< _PCCP::template _CopyMovePair< false, _T1, _U2 >(), bool >::type  = false> pair (const _T1 &__x, _U2 &&__y)
constexpr pair (const pair &)=default
Copy constructor.
template<typename _U1 , typename _U2 , typename enable_if< _PCCFP< _U1, _U2 >::template _ConstructiblePair< _U1, _U2 >() &&_PCCFP< _U1, _U2 >::template _ImplicitlyConvertiblePair< _U1, _U2 >(), bool >::type  = true> constexpr pair (const pair< _U1, _U2 > &__p)
template<typename _U1 , typename _U2 , typename enable_if< _PCCFP< _U1, _U2 >::template _ConstructiblePair< _U1, _U2 >() &&!_PCCFP< _U1, _U2 >::template _ImplicitlyConvertiblePair< _U1, _U2 >(), bool >::type  = false> constexpr pair (const pair< _U1, _U2 > &__p)
constexpr pair (pair &&)=default
Move constructor.
template<typename _U1 , typename _U2 , typename enable_if< _PCCFP< _U1, _U2 >::template _MoveConstructiblePair< _U1, _U2 >() &&_PCCFP< _U1, _U2 >::template _ImplicitlyMoveConvertiblePair< _U1, _U2 >(), bool >::type  = true> constexpr pair (pair< _U1, _U2 > &&__p)
template<typename _U1 , typename _U2 , typename enable_if< _PCCFP< _U1, _U2 >::template _MoveConstructiblePair< _U1, _U2 >() &&!_PCCFP< _U1, _U2 >::template _ImplicitlyMoveConvertiblePair< _U1, _U2 >(), bool >::type  = false> constexpr pair (pair< _U1, _U2 > &&__p)
template<typename... _Args1, typename... _Args2> constexpr pair (piecewise_construct_t, tuple< _Args1... >, tuple< _Args2... >)
template<typename _U1 , typename _U2 > constexpr enable_if< __and_< is_assignable< _T1 &, const _U1 & >, is_assignable< _T2 &, const _U2 & > >::value, pair & >::type operator= (const pair< _U1, _U2 > &__p)
template<typename _U1 , typename _U2 > constexpr enable_if< __and_< is_assignable< _T1 &, _U1 && >, is_assignable< _T2 &, _U2 && > >::value, pair & >::type operator= (pair< _U1, _U2 > &&__p)
constexpr pair & operator= (typename conditional< __and_< is_copy_assignable< _T1 >, is_copy_assignable< _T2 >>::value, const pair &, const __nonesuch & >::type __p)
constexpr pair & operator= (typename conditional< __and_< is_move_assignable< _T1 >, is_move_assignable< _T2 >>::value, pair &&, __nonesuch && >::type __p) noexcept(__and_< is_nothrow_move_assignable< _T1 >, is_nothrow_move_assignable< _T2 >>::value)
constexpr void swap (pair &__p) noexcept(__and_< __is_nothrow_swappable< _T1 >, __is_nothrow_swappable< _T2 >>::value)
Swap the first members and then the second members.

Public Attributes

_T1 first
The first member.
_T2 second
The second member.

Detailed Description

template<typename _T1, typename _T2>

struct std::pair< _T1, _T2 >" Struct holding two objects of arbitrary type.

Template Parameters

_T1 Type of first object.
_T2 Type of second object.

https://gcc.gnu.org/onlinedocs/libstdc++/manual/utilities.html

Definition at line 211 of file stl_pair.h.

Member Typedef Documentation

template<typename _T1 , typename _T2 > typedef _T1 std::pair< _T1, _T2 >::first_type

The type of the first member.

Definition at line 214 of file stl_pair.h.

template<typename _T1 , typename _T2 > typedef _T2 std::pair< _T1, _T2 >::second_type

The type of the second member.

Definition at line 215 of file stl_pair.h.

Constructor & Destructor Documentation

template<typename _T1 , typename _T2 > template<typename _U1  = _T1, typename _U2  = _T2, typename enable_if< __and_< __is_implicitly_default_constructible< _U1 >, __is_implicitly_default_constructible< _U2 >> ::value, bool >::type  = true> constexpr std::pair< _T1, _T2 >::pair () [inline], [constexpr]

The default constructor creates first and second using their respective default constructors.

Definition at line 232 of file stl_pair.h.

template<typename _T1 , typename _T2 > template<typename _U1  = _T1, typename _U2  = _T2, typename enable_if< _PCCP::template _ConstructiblePair< _U1, _U2 >() &&_PCCP::template _ImplicitlyConvertiblePair< _U1, _U2 >(), bool >::type  = true> constexpr std::pair< _T1, _T2 >::pair (const _T1 & __a, const _T2 & __b) [inline], [constexpr]

Construct from two const lvalues, allowing implicit conversions.

Definition at line 266 of file stl_pair.h.

template<typename _T1 , typename _T2 > template<typename _U1  = _T1, typename _U2  = _T2, typename enable_if< _PCCP::template _ConstructiblePair< _U1, _U2 >() &&!_PCCP::template _ImplicitlyConvertiblePair< _U1, _U2 >(), bool >::type  = false> constexpr std::pair< _T1, _T2 >::pair (const _T1 & __a, const _T2 & __b) [inline], [explicit], [constexpr]

Construct from two const lvalues, disallowing implicit conversions.

Definition at line 276 of file stl_pair.h.

template<typename _T1 , typename _T2 > constexpr std::pair< _T1, _T2 >::pair (const pair< _T1, _T2 > &) [constexpr], [default]

Copy constructor.

template<typename _T1 , typename _T2 > constexpr std::pair< _T1, _T2 >::pair (pair< _T1, _T2 > &&) [constexpr], [default]

Move constructor.

Member Function Documentation

template<typename _T1 , typename _T2 > constexpr void std::pair< _T1, _T2 >::swap (pair< _T1, _T2 > & __p) [inline], [constexpr], [noexcept]

Swap the first members and then the second members.

Definition at line 439 of file stl_pair.h.

Referenced by std::pair< _T1, _T2 >::swap().

Member Data Documentation

template<typename _T1 , typename _T2 > _T1 std::pair< _T1, _T2 >::first

The first member.

Definition at line 217 of file stl_pair.h.

Referenced by std::_Temporary_buffer< _ForwardIterator, _Tp >::_Temporary_buffer(), __gnu_parallel::__find_template(), std::__sample(), std::set< _Key, _Compare, _Alloc >::insert(), std::pair< _T1, _T2 >::operator<(), and std::pair< _T1, _T2 >::operator==().

template<typename _T1 , typename _T2 > _T2 std::pair< _T1, _T2 >::second

The second member.

Definition at line 218 of file stl_pair.h.

Referenced by std::__sample(), std::set< _Key, _Compare, _Alloc >::insert(), std::pair< _T1, _T2 >::operator<(), and std::pair< _T1, _T2 >::operator==().

Author

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Wed Apr 28 2021 libstdc++