Provided by: libstdc++-8-doc_8.3.0-23ubuntu2_all bug

NAME

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

SYNOPSIS

       Inherits std::__pair_base< _U1, _U2 >.

   Public Types
       template<typename _U1 , typename _U2 > using _PCCFP = _PCC<!is_same< _T1, _U1
           >::value||!is_same< _T2, _U2 >::value, _T1, _T2 >
       using _PCCP = _PCC< true, _T1, _T2 >
       typedef _T1 first_type
       typedef _T2 second_type
           first_type is the first bound type

   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 ()
           second is a copy of the second object
       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)
       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)
       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 (const pair &)=default
       constexpr pair (pair &&)=default
       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 _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)
       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 _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> pair (piecewise_construct_t, tuple<
           _Args1... >, tuple< _Args2... >)
       pair & operator= (typename conditional< __and_< is_copy_assignable< _T1 >,
           is_copy_assignable< _T2 >>::value, const pair &, const __nonesuch_no_braces &>::type
           __p)
       pair & operator= (typename conditional< __and_< is_move_assignable< _T1 >,
           is_move_assignable< _T2 >>::value, pair &&, __nonesuch_no_braces &&>::type __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)
       void swap (pair &__p) noexcept(__and_< __is_nothrow_swappable< _T1 >,
           __is_nothrow_swappable< _T2 >>::value)

   Public Attributes
       _T1 first
           second_type is the second bound type
       _T2 second
           first is a copy of the first object

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.

       Definition at line 208 of file stl_pair.h.

Member Typedef Documentation

   template<typename _T1, typename _T2> template<typename _U1 , typename _U2 > using std::pair<
       _T1, _T2 >::_PCCFP =  _PCC<!is_same<_T1, _U1>::value || !is_same<_T2, _U2>::value, _T1,
       _T2>
       There is also a templated copy ctor for the pair class itself.

       Definition at line 283 of file stl_pair.h.

   template<typename _T1, typename _T2> using std::pair< _T1, _T2 >::_PCCP =  _PCC<true, _T1,
       _T2>
       Two objects may be passed to a pair constructor to be copied.

       Definition at line 252 of file stl_pair.h.

   template<typename _T1, typename _T2> typedef _T2 std::pair< _T1, _T2 >::second_type
       first_type is the first bound type

       Definition at line 212 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]
       second is a copy of the second object The default constructor creates first and second
       using their respective default constructors.

       Definition at line 229 of file stl_pair.h.

Member Data Documentation

   template<typename _T1, typename _T2> _T1 std::pair< _T1, _T2 >::first
       second_type is the second bound type

       Definition at line 214 of file stl_pair.h.

       Referenced by __gnu_parallel::__qsb_conquer(), std::__sample(),
       __gnu_debug::__valid_range_aux(), std::set< _Key, _Compare, _Alloc >::insert(),
       std::operator<(), std::operator==(), and std::regex_replace().

   template<typename _T1, typename _T2> _T2 std::pair< _T1, _T2 >::second
       first is a copy of the first object

       Definition at line 215 of file stl_pair.h.

       Referenced by __gnu_debug::__get_distance(), __gnu_parallel::__qsb_conquer(),
       std::__sample(), __gnu_debug::__valid_range_aux(), std::set< _Key, _Compare, _Alloc
       >::insert(), std::operator==(), and std::regex_replace().

Author

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