std::pair man page

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

Synopsis

Public Types

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< _ConstructiblePair< _T1, _T2, _U1, _U2 >() &&_ImplicitlyConvertiblePair< _T1, _T2, _U1, _U2 >(), bool >::type = true> constexpr pair (const _T1 &__a, const _T2 &__b)

template<typename _U1 = _T1, typename _U2 = _T2, typename enable_if< _ConstructiblePair< _T1, _T2, _U1, _U2 >() &&!_ImplicitlyConvertiblePair< _T1, _T2, _U1, _U2 >(), bool >::type = false> constexpr pair (const _T1 &__a, const _T2 &__b)

template<typename _U1 , typename _U2 , typename enable_if< _ConstructiblePair< _T1, _T2, _U1, _U2 >() &&_ImplicitlyConvertiblePair< _T1, _T2, _U1, _U2 >(), bool >::type = true> constexpr pair (const pair< _U1, _U2 > &__p)

template<typename _U1 , typename _U2 , typename enable_if< _ConstructiblePair< _T1, _T2, _U1, _U2 >() &&!_ImplicitlyConvertiblePair< _T1, _T2, _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< _ConstructiblePair< _T2, _T2, _T2, _T2 >() &&_MoveConstructiblePair< _T1, _T2, _U1, _T2 >() &&_ImplicitlyConvertiblePair< _T2, _T2, _T2, _T2 >() &&_ImplicitlyMoveConvertiblePair< _T1, _T2, _U1, _T2 >(), bool >::type = true> constexpr pair (_U1 &&__x, const _T2 &__y)

template<typename _U1 , typename enable_if< _ConstructiblePair< _T2, _T2, _T2, _T2 >() &&_MoveConstructiblePair< _T1, _T2, _U1, _T2 >() &&(!_ImplicitlyConvertiblePair< _T2, _T2, _T2, _T2 >()||!_ImplicitlyMoveConvertiblePair< _T1, _T2, _U1, _T2 >()), bool >::type = false> constexpr pair (_U1 &&__x, const _T2 &__y)

template<typename _U2 , typename enable_if< _ConstructiblePair< _T1, _T1, _T1, _T1 >() &&_MoveConstructiblePair< _T1, _T2, _T1, _U2 >() &&_ImplicitlyConvertiblePair< _T1, _T1, _T1, _T1 >() &&_ImplicitlyMoveConvertiblePair< _T1, _T2, _T1, _U2 >(), bool >::type = true> constexpr pair (const _T1 &__x, _U2 &&__y)

template<typename _U2 , typename enable_if< _ConstructiblePair< _T1, _T1, _T1, _T1 >() &&_MoveConstructiblePair< _T1, _T2, _T1, _U2 >() &&(!_ImplicitlyConvertiblePair< _T1, _T1, _T1, _T1 >()||!_ImplicitlyMoveConvertiblePair< _T1, _T2, _T1, _U2 >()), bool >::type = false> pair (const _T1 &__x, _U2 &&__y)

template<typename _U1 , typename _U2 , typename enable_if< _MoveConstructiblePair< _T1, _T2, _U1, _U2 >() &&_ImplicitlyMoveConvertiblePair< _T1, _T2, _U1, _U2 >(), bool >::type = true> constexpr pair (_U1 &&__x, _U2 &&__y)

template<typename _U1 , typename _U2 , typename enable_if< _MoveConstructiblePair< _T1, _T2, _U1, _U2 >() &&!_ImplicitlyMoveConvertiblePair< _T1, _T2, _U1, _U2 >(), bool >::type = false> constexpr pair (_U1 &&__x, _U2 &&__y)

template<typename _U1 , typename _U2 , typename enable_if< _MoveConstructiblePair< _T1, _T2, _U1, _U2 >() &&_ImplicitlyMoveConvertiblePair< _T1, _T2, _U1, _U2 >(), bool >::type = true> constexpr pair (pair< _U1, _U2 > &&__p)

template<typename _U1 , typename _U2 , typename enable_if< _MoveConstructiblePair< _T1, _T2, _U1, _U2 >() &&!_ImplicitlyMoveConvertiblePair< _T1, _T2, _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= (const pair &__p)

pair & operator= (pair &&__p) noexcept(__and_< is_nothrow_move_assignable< _T1 >, is_nothrow_move_assignable< _T2 >>::value)

template<typename _U1 , typename _U2 > pair & operator= (const pair< _U1, _U2 > &__p)

template<typename _U1 , typename _U2 > pair & operator= (pair< _U1, _U2 > &&__p)

void swap (pair &__p) noexcept(__is_nothrow_swappable< _T1 >::value &&__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 147 of file stl_pair.h.

Member Typedef Documentation

template<typename _T1, typename _T2> typedef _T2 std::pair< _T1, _T2 >::second_type

first_type is the first bound type

Definition at line 150 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 167 of file stl_pair.h.

template<typename _T1, typename _T2> template<typename _U1 = _T1, typename _U2 = _T2, typename enable_if< _ConstructiblePair< _T1, _T2, _U1, _U2 >() &&_ImplicitlyConvertiblePair< _T1, _T2, _U1, _U2 >(), bool >::type = true> constexpr std::pair< _T1, _T2 >::pair (const _T1 & __a, const _T2 & __b) [inline]

Two objects may be passed to a pair constructor to be copied.

Definition at line 193 of file stl_pair.h.

template<typename _T1, typename _T2> template<typename _U1 , typename _U2 , typename enable_if< _ConstructiblePair< _T1, _T2, _U1, _U2 >() &&_ImplicitlyConvertiblePair< _T1, _T2, _U1, _U2 >(), bool >::type = true> constexpr std::pair< _T1, _T2 >::pair (const pair< _U1, _U2 > & __p) [inline]

There is also a templated copy ctor for the pair class itself.

Definition at line 214 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 152 of file stl_pair.h.

Referenced by __gnu_parallel::__qsb_conquer(), __gnu_debug::__valid_range_aux(), std::set< _Key, _Compare, _Alloc >::insert(), std::operator<(), std::operator==(), std::pair< _BiIter, _BiIter >::pair(), 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 153 of file stl_pair.h.

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

Author

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Info

Fri Sep 16 2016 libstdc++