std::pair< _T1, _T2 >(3)   Library Functions Manual   std::pair< _T1, _T2 >(3)

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


SYNOPSIS
       #include <utility>

       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 _U2 , __enable_if_t< __and_< is_pointer< _T1 >,
           __not_< is_reference< _U2 > >, is_constructible< _T2, _U2 >,
           __not_< is_constructible< _T2, const _U2 & > >, is_convertible<
           _U2, _T2 > >::value, bool >  = true> constexpr pair
           (__zero_as_null_pointer_constant, _U2 &&__y,...)
       template<typename _U2 , __enable_if_t< __and_< is_pointer< _T1 >,
           __not_< is_reference< _U2 > >, is_constructible< _T2, _U2 >,
           __not_< is_constructible< _T2, const _U2 & > >, __not_<
           is_convertible< _U2, _T2 > > >::value, bool >  = false> constexpr
           pair (__zero_as_null_pointer_constant, _U2 &&__y,...)
       template<typename _U1 , __enable_if_t< __and_< __not_< is_reference<
           _U1 > >, is_pointer< _T2 >, is_constructible< _T1, _U1 >, __not_<
           is_constructible< _T1, const _U1 & > >, is_convertible< _U1, _T1 >
           >::value, bool >  = true> constexpr pair (_U1 &&__x,
           __zero_as_null_pointer_constant,...)
       template<typename _U1 , __enable_if_t< __and_< __not_< is_reference<
           _U1 > >, is_pointer< _T2 >, is_constructible< _T1, _U1 >, __not_<
           is_constructible< _T1, const _U1 & > >, __not_< is_convertible<
           _U1, _T1 > > >::value, bool >  = false> constexpr pair (_U1 &&__x,
           __zero_as_null_pointer_constant,...)
       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  = _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.
       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... >)
       pair & operator= (__conditional_t< __and_< is_copy_assignable< _T1 >,
           is_copy_assignable< _T2 > >::value, const pair &, const __nonesuch
           & > __p)
       pair & operator= (__conditional_t< __and_< is_move_assignable< _T1 >,
           is_move_assignable< _T2 > >::value, pair &&, __nonesuch && > __p)
           noexcept(__and_< is_nothrow_move_assignable< _T1 >,
           is_nothrow_move_assignable< _T2 > >::value)
       template<typename _U1 , typename _U2 > 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 > enable_if< __and_<
           is_assignable< _T1 &, _U1 && >, is_assignable< _T2 &, _U2 && >
           >::value, pair & >::type operator= (pair< _U1, _U2 > &&__p)
       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 Symbols
       (Note that these are not member symbols.)
       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 > pair (_T1, _T2) -> pair<
               _T1, _T2 >
               Two pairs of the same type are equal iff their members are
               equal.
           template<typename _T1 , typename _T2 > constexpr bool operator==
               (const pair< _T1, _T2 > &__x, const pair< _T1, _T2 > &__y)
               Two pairs of the same type are equal iff their members are
               equal.
           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 > std::pair< _T1, _T2 >::pair (const
       pair< _T1, _T2 > & ) [constexpr],  [default]
       Copy constructor.

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

   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> 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>
       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>
       std::pair< _T1, _T2 >::pair (const _T1 & __a, const _T2 & __b)
       [inline],  [explicit],  [constexpr]
       Construct from two const lvalues, disallowing implicit conversions.

Member Function Documentation
   template<typename _T1 , typename _T2 > 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(), std::pair< _T1, _T2
       >::swap(), std::sub_match< _BiIter >::swap(), std::swap(), and
       std::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(), std::pair< _T1, _T2 >::pair(),
       __gnu_parallel::__find_template(), __gnu_parallel::__find_template(),
       std::__sample(), std::set< _Key, _Compare, _Alloc >::insert(),
       std::pair< _T1, _T2 >::operator<(), std::pair< _T1, _T2
       >::operator==(), std::shuffle(), and std::pair< _T1, _T2 >::swap().

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

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


Author
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                                   libstdc++          std::pair< _T1, _T2 >(3)