NAME

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

SYNOPSIS

       #include <stl_pair.h>

       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.

   Related Functions
       (Note that these are not member functions.)
       template<typename _T1 , typename _T2 > constexpr pair< typename __decay_and_strip< _T1
           >::__type, typename __decay_and_strip< _T2 >::__type > make_pair (_T1 &&__x, _T2
           &&__y)
           A convenience wrapper for creating a pair from two objects.

           template<typename _T1 , typename _T2 > constexpr bool operator== (const pair< _T1, _T2
               > &__x, const pair< _T1, _T2 > &__y)
           template<typename _T1 , typename _T2 > constexpr bool operator< (const pair< _T1, _T2
               > &__x, const pair< _T1, _T2 > &__y)
           template<typename _T1 , typename _T2 > constexpr bool operator!= (const pair< _T1, _T2
               > &__x, const pair< _T1, _T2 > &__y)
               Uses operator== to find the result.
           template<typename _T1 , typename _T2 > constexpr bool operator> (const pair< _T1, _T2
               > &__x, const pair< _T1, _T2 > &__y)
               Uses operator< to find the result.
           template<typename _T1 , typename _T2 > constexpr bool operator<= (const pair< _T1, _T2
               > &__x, const pair< _T1, _T2 > &__y)
               Uses operator< to find the result.
           template<typename _T1 , typename _T2 > constexpr bool operator>= (const pair< _T1, _T2
               > &__x, const pair< _T1, _T2 > &__y)
               Uses operator< to find the result.
           template<typename _T1 , typename _T2 > constexpr enable_if< __and_< __is_swappable<
               _T1 >, __is_swappable< _T2 > >::value >::type swap (pair< _T1, _T2 > &__x, pair<
               _T1, _T2 > &__y) noexcept(noexcept(__x.swap(__y)))

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

Member Typedef Documentation

   template<typename _T1 , typename _T2 > typedef _T1 std::pair< _T1, _T2 >::first_type
       The type of the first member.

   template<typename _T1 , typename _T2 > typedef _T2 std::pair< _T1, _T2 >::second_type
       The type of the second member.

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.

   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.

   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.

   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.

       References std::pair< _T1, _T2 >::first, std::pair< _T1, _T2 >::second, and std::pair<
       _T1, _T2 >::swap().

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

Member Data Documentation

   template<typename _T1 , typename _T2 > _T1 std::pair< _T1, _T2 >::first
       The first member.

       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<(), std::pair< _T1, _T2 >::operator==(), and
       std::pair< _T1, _T2 >::swap().

   template<typename _T1 , typename _T2 > _T2 std::pair< _T1, _T2 >::second
       The second member.

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

Author

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