std::pair< _T1, _T2 >(3cxx) std::pair< _T1, _T2 >(3cxx)
NAME
std::pair< _T1, _T2 > - 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.
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::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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libstdc++ Sat May 13 2023 std::pair< _T1, _T2 >(3cxx)
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