oracular (3) std::pair.3cxx.gz
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 > 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.
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.
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(), and std::sub_match< _BiIter >::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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libstdc++ std::pair< _T1, _T2 >(3cxx)