std::pair< _T1, _T2 >(3cxx) | std::pair< _T1, _T2 >(3cxx) |
NAME¶
std::pair< _T1, _T2 > - Struct holding two objects of arbitrary type.
SYNOPSIS¶
#include <stl_pair.h>
Inherits __pair_base< _T1, _T2 >.
Inherited by std::sub_match< _Bi_iter >.
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 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 > 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
_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::pair< _T1, _T2 >::swap().
template<typename _T1 , typename _T2 > _T2 std::pair< _T1, _T2 >::second¶
The second member.
Referenced by std::pair< _T1, _T2 >::swap().
Author¶
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