.TH "__gnu_cxx::pair< _T1, _T2 >" 3 "libstdc++" \" -*- nroff -*-
.ad l
.nh
.SH NAME
__gnu_cxx::pair< _T1, _T2 > \- Struct holding two objects (or references) of arbitrary type\&.  

.SH SYNOPSIS
.br
.PP
.PP
\fR#include <utility>\fP
.SS "Public Types"

.in +1c
.ti -1c
.RI "typedef _T1 \fBfirst_type\fP"
.br
.RI "The type of the \fRfirst\fP member\&. "
.ti -1c
.RI "typedef _T2 \fBsecond_type\fP"
.br
.RI "The type of the \fRsecond\fP member\&. "
.in -1c
.SS "Public Member Functions"

.in +1c
.ti -1c
.RI "constexpr \fBpair\fP (const pair &)=default"
.br
.RI "Copy constructor\&. "
.ti -1c
.RI "constexpr \fBpair\fP (pair &&)=default"
.br
.RI "Move constructor\&. "
.ti -1c
.RI "template<typename\&.\&.\&. _Args1, typename\&.\&.\&. _Args2> constexpr \fBpair\fP (piecewise_construct_t, tuple< _Args1\&.\&.\&. >, tuple< _Args2\&.\&.\&. >)"
.br
.ti -1c
.RI "template<typename _U1, typename _U2> constexpr \fBexplicit\fP (!_S_convertible< _U1 &, _U2 & >()) \fBpair\fP(\fBpair\fP< _U1"
.br
.ti -1c
.RI "template<typename _U1, typename _U2> constexpr _U2 &&constexpr \fBexplicit\fP (!_S_convertible< _U1 &, _U2 & >()) \fBpair\fP(\fBpair\fP< _U1"
.br
.RI "Converting constructor from a non-const \fRpair<U1, U2>\fP lvalue\&. "
.ti -1c
.RI "template<typename _U1 = _T1, typename _U2 = _T2> constexpr \fBexplicit\fP (!_S_convertible< _U1, _U2 >()) \fBpair\fP(_U1 &&"
.br
.ti -1c
.RI "template<typename _U1 = _T1, typename _U2 = _T2> constexpr \fBexplicit\fP (!_S_convertible< _U1, _U2 >()) \fBpair\fP(_U1 &&__x"
.br
.RI "Constructor accepting two values of arbitrary types\&. "
.ti -1c
.RI "template<typename _U1, typename _U2> constexpr \fBexplicit\fP (!_S_convertible< _U1, _U2 >()) \fBpair\fP(\fBpair\fP< _U1"
.br
.ti -1c
.RI "template<typename _U1, typename _U2> constexpr _U2 &constexpr \fBexplicit\fP (!_S_convertible< _U1, _U2 >()) \fBpair\fP(\fBpair\fP< _U1"
.br
.RI "Converting constructor from a non-const \fRpair<U1, U2>\fP rvalue\&. "
.ti -1c
.RI "constexpr \fBexplicit\fP (!_S_convertible< const _T1 &, const _T2 & >()) \fBpair\fP(const type_identity_t< _T1 > &__x"
.br
.RI "Constructor accepting lvalues of \fRfirst_type\fP and \fRsecond_type\fP\&. "
.ti -1c
.RI "template<typename _U1, typename _U2> constexpr \fBexplicit\fP (!_S_convertible< const _U1 &, const _U2 & >()) \fBpair\fP(const \fBpair\fP< _U1"
.br
.ti -1c
.RI "template<typename _U1, typename _U2> constexpr _U2 &&constexpr \fBexplicit\fP (!_S_convertible< const _U1 &, const _U2 & >()) \fBpair\fP(const \fBpair\fP< _U1"
.br
.RI "Converting constructor from a const \fRpair<U1, U2>\fP lvalue\&. "
.ti -1c
.RI "template<typename _U1, typename _U2> constexpr \fBexplicit\fP (!_S_convertible< const _U1, const _U2 >()) \fBpair\fP(const \fBpair\fP< _U1"
.br
.ti -1c
.RI "template<typename _U1, typename _U2> constexpr _U2 &constexpr \fBexplicit\fP (!_S_convertible< const _U1, const _U2 >()) \fBpair\fP(const \fBpair\fP< _U1"
.br
.RI "Converting constructor from a const \fRpair<U1, U2>\fP rvalue\&. "
.ti -1c
.RI "template<__eligible_pair_like< \fBpair\fP > _UPair> constexpr \fBexplicit\fP (!_S_convertible_from_pair_like< _UPair >()) \fBpair\fP(_UPair &&)=delete"
.br
.ti -1c
.RI "template<__eligible_pair_like< \fBpair\fP > _UPair> constexpr _U2 &&constexpr \fBexplicit\fP (!_S_convertible_from_pair_like< _UPair >()) \fBpair\fP(_UPair &&__p)"
.br
.ti -1c
.RI "constexpr \fBexplicit\fP (__not_< __and_< __is_implicitly_default_constructible< _T1 >, __is_implicitly_default_constructible< _T2 > > >()) \fBpair\fP() noexcept(is_nothrow_default_constructible_v< _T1 > &&is_nothrow_default_constructible_v< _T2 >)"
.br
.RI "Default constructor\&. "
.ti -1c
.RI "constexpr _U2 &&constexpr _U2 &__p \fBnoexcept\fP (_S_nothrow_constructible< _U1 &, _U2 & >())"
.br
.ti -1c
.RI "constexpr _U2 &constexpr _U2 &&__p \fBnoexcept\fP (_S_nothrow_constructible< _U1, _U2 >())"
.br
.ti -1c
.RI "constexpr _U2 &&__y \fBnoexcept\fP (_S_nothrow_constructible< _U1, _U2 >())"
.br
.ti -1c
.RI "constexpr const _T2 &__y \fBnoexcept\fP (_S_nothrow_constructible< const _T1 &, const _T2 & >())"
.br
.ti -1c
.RI "constexpr _U2 &&constexpr _U2 &__p \fBnoexcept\fP (_S_nothrow_constructible< const _U1 &, const _U2 & >())"
.br
.ti -1c
.RI "constexpr _U2 &constexpr _U2 &&__p \fBnoexcept\fP (_S_nothrow_constructible< const _U1, const _U2 >())"
.br
.ti -1c
.RI "template<__eligible_pair_like< \fBpair\fP > _UPair> constexpr \fBpair\fP & \fBoperator=\fP (_UPair &&__p)"
.br
.ti -1c
.RI "template<__eligible_pair_like< \fBpair\fP > _UPair> constexpr const \fBpair\fP & \fBoperator=\fP (_UPair &&__p) const"
.br
.ti -1c
.RI "\fBpair\fP & \fBoperator=\fP (const \fBpair\fP &)=delete"
.br
.ti -1c
.RI "constexpr const \fBpair\fP & \fBoperator=\fP (const \fBpair\fP &__p) const"
.br
.RI "Copy assignment operator (const)\&. "
.ti -1c
.RI "constexpr \fBpair\fP & \fBoperator=\fP (const \fBpair\fP &__p) noexcept(_S_nothrow_assignable< const _T1 &, const _T2 & >())"
.br
.RI "Copy assignment operator\&. "
.ti -1c
.RI "template<typename _U1, typename _U2> 
.br
requires (_S_const_assignable<const _U1&, const _U2&>())constexpr const \fBpair\fP & \fBoperator=\fP (const \fBpair\fP< _U1, _U2 > &__p) const"
.br
.RI "Converting assignment from a const \fRpair<U1, U2>\fP lvalue\&. "
.ti -1c
.RI "template<typename _U1, typename _U2> 
.br
requires (_S_assignable<const _U1&, const _U2&>())constexpr \fBpair\fP & \fBoperator=\fP (const \fBpair\fP< _U1, _U2 > &__p) noexcept(_S_nothrow_assignable< const _U1 &, const _U2 & >())"
.br
.RI "Converting assignment from a const \fRpair<U1, U2>\fP lvalue\&. "
.ti -1c
.RI "constexpr const \fBpair\fP & \fBoperator=\fP (\fBpair\fP &&__p) const"
.br
.RI "Move assignment operator (const)\&. "
.ti -1c
.RI "constexpr \fBpair\fP & \fBoperator=\fP (\fBpair\fP &&__p) noexcept(_S_nothrow_assignable< _T1, _T2 >())"
.br
.RI "Move assignment operator\&. "
.ti -1c
.RI "template<typename _U1, typename _U2> 
.br
requires (_S_const_assignable<_U1, _U2>())constexpr const \fBpair\fP & \fBoperator=\fP (\fBpair\fP< _U1, _U2 > &&__p) const"
.br
.RI "Converting assignment from a non-const \fRpair<U1, U2>\fP rvalue\&. "
.ti -1c
.RI "template<typename _U1, typename _U2> 
.br
requires (_S_assignable<_U1, _U2>())constexpr \fBpair\fP & \fBoperator=\fP (\fBpair\fP< _U1, _U2 > &&__p) noexcept(_S_nothrow_assignable< _U1, _U2 >())"
.br
.RI "Converting assignment from a non-const \fRpair<U1, U2>\fP rvalue\&. "
.ti -1c
.RI "constexpr void \fBswap\fP (const \fBpair\fP &__p) const noexcept(__and_v< __is_nothrow_swappable< const _T1 >, __is_nothrow_swappable< const _T2 > >)"
.br
.ti -1c
.RI "constexpr void \fBswap\fP (\fBpair\fP &__p) noexcept(__and_< __is_nothrow_swappable< _T1 >, __is_nothrow_swappable< _T2 > >::value)"
.br
.RI "Swap the first members and then the second members\&. "
.in -1c
.SS "Public Attributes"

.in +1c
.ti -1c
.RI "_T1 \fBfirst\fP"
.br
.RI "The first member\&. "
.ti -1c
.RI "_T2 \fBsecond\fP"
.br
.RI "The second member\&. "
.in -1c
.SS "Related Symbols"
(Note that these are not member symbols\&.) 
.PP
.RI "\fB\fP"
.br

.in +1c
.in +1c
.ti -1c
.RI "template<typename _T1, typename _T2> \fBpair\fP (_T1, _T2) \-> pair< _T1, _T2 >"
.br
.ti -1c
.RI "template<typename _T1, typename _T2> constexpr enable_if< __and_< __is_swappable< _T1 >, __is_swappable< _T2 > >::value >\fB::type\fP \fBswap\fP (\fBpair\fP< _T1, _T2 > &__x, \fBpair\fP< _T1, _T2 > &__y) noexcept(noexcept(__x\&.swap(__y)))"
.br
.ti -1c
.RI "template<typename _T1, typename _T2, typename _U1, typename _U2> constexpr bool \fBoperator==\fP (const \fBpair\fP< _T1, _T2 > &__x, const \fBpair\fP< _U1, _U2 > &__y)"
.br
.RI "Two pairs are equal iff their members are equal\&. "
.ti -1c
.RI "template<typename _T1, typename _T2, typename _U1, typename _U2> constexpr common_comparison_category_t< __detail::__synth3way_t< _T1, _U1 >, __detail::__synth3way_t< _T2, _U2 > > \fBoperator<=>\fP (const \fBpair\fP< _T1, _T2 > &__x, const \fBpair\fP< _U1, _U2 > &__y)"
.br
.in -1c
.in -1c
.SH "Detailed Description"
.PP 

.SS "template<typename _T1, typename _T2>
.br
struct __gnu_cxx::pair< _T1, _T2 >"Struct holding two objects (or references) of arbitrary type\&. 


.PP
\fBTemplate Parameters\fP
.RS 4
\fI_T1\fP Type of the \fRfirst\fP member\&. 
.br
\fI_T2\fP Type of the \fRsecond\fP member\&.
.RE
.PP
https://gcc.gnu.org/onlinedocs/libstdc++/manual/utilities.html 
.SH "Member Typedef Documentation"
.PP 
.SS "template<typename _T1, typename _T2> typedef _T1 \fBstd::pair\fP< _T1, _T2 >::first_type"

.PP
The type of the \fRfirst\fP member\&. 
.SS "template<typename _T1, typename _T2> typedef _T2 \fBstd::pair\fP< _T1, _T2 >::second_type"

.PP
The type of the \fRsecond\fP member\&. 
.SH "Constructor & Destructor Documentation"
.PP 
.SS "template<typename _T1, typename _T2> \fBstd::pair\fP< _T1, _T2 >::pair (const pair< _T1, _T2 > & )\fR [constexpr]\fP, \fR [default]\fP"

.PP
Copy constructor\&. 
.SS "template<typename _T1, typename _T2> \fBstd::pair\fP< _T1, _T2 >::pair (pair< _T1, _T2 > && )\fR [constexpr]\fP, \fR [default]\fP"

.PP
Move constructor\&. 
.SH "Member Function Documentation"
.PP 
.SS "template<typename _T1, typename _T2> template<typename _U1, typename _U2> _U2 &&constexpr \fBstd::pair\fP< _T1, _T2 >::explicit (!_S_convertible< _U1 &, _U2 & > ())\fR [constexpr]\fP"

.PP
Converting constructor from a non-const \fRpair<U1, U2>\fP lvalue\&. 
.SS "template<typename _T1, typename _T2> template<typename _U1 = _T1, typename _U2 = _T2> \fBstd::pair\fP< _T1, _T2 >::explicit (!_S_convertible< _U1, _U2 > ()) &&\fR [constexpr]\fP"

.PP
Constructor accepting two values of arbitrary types\&. 
.SS "template<typename _T1, typename _T2> template<typename _U1, typename _U2> _U2 &constexpr \fBstd::pair\fP< _T1, _T2 >::explicit (!_S_convertible< _U1, _U2 > ())\fR [constexpr]\fP"

.PP
Converting constructor from a non-const \fRpair<U1, U2>\fP rvalue\&. 
.SS "template<typename _T1, typename _T2> \fBstd::pair\fP< _T1, _T2 >::explicit (!_S_convertible< const _T1 &, const _T2 & > ()) const &\fR [constexpr]\fP"

.PP
Constructor accepting lvalues of \fRfirst_type\fP and \fRsecond_type\fP\&. 
.SS "template<typename _T1, typename _T2> template<typename _U1, typename _U2> _U2 &&constexpr \fBstd::pair\fP< _T1, _T2 >::explicit (!_S_convertible< const _U1 &, const _U2 & > ()) const\fR [constexpr]\fP"

.PP
Converting constructor from a const \fRpair<U1, U2>\fP lvalue\&. 
.SS "template<typename _T1, typename _T2> template<typename _U1, typename _U2> _U2 &constexpr \fBstd::pair\fP< _T1, _T2 >::explicit (!_S_convertible< const _U1, const _U2 > ()) const\fR [constexpr]\fP"

.PP
Converting constructor from a const \fRpair<U1, U2>\fP rvalue\&. 
.SS "template<typename _T1, typename _T2> \fBstd::pair\fP< _T1, _T2 >::explicit (__not_< __and_< __is_implicitly_default_constructible< _T1 >, __is_implicitly_default_constructible< _T2 > > > ())\fR [inline]\fP, \fR [constexpr]\fP, \fR [noexcept]\fP"

.PP
Default constructor\&. 
.SS "template<typename _T1, typename _T2> const \fBpair\fP & \fBstd::pair\fP< _T1, _T2 >::operator= (const \fBpair\fP< _T1, _T2 > & __p) const\fR [inline]\fP, \fR [constexpr]\fP"

.PP
Copy assignment operator (const)\&. 
.SS "template<typename _T1, typename _T2> \fBpair\fP & \fBstd::pair\fP< _T1, _T2 >::operator= (const \fBpair\fP< _T1, _T2 > & __p)\fR [inline]\fP, \fR [constexpr]\fP, \fR [noexcept]\fP"

.PP
Copy assignment operator\&. 
.SS "template<typename _T1, typename _T2> template<typename _U1, typename _U2> 
.br
requires (_S_const_assignable<const _U1&, const _U2&>())const \fBpair\fP & \fBstd::pair\fP< _T1, _T2 >::operator= (const \fBpair\fP< _U1, _U2 > & __p) const\fR [inline]\fP, \fR [constexpr]\fP"

.PP
Converting assignment from a const \fRpair<U1, U2>\fP lvalue\&. 
.SS "template<typename _T1, typename _T2> template<typename _U1, typename _U2> 
.br
requires (_S_assignable<const _U1&, const _U2&>())\fBpair\fP & \fBstd::pair\fP< _T1, _T2 >::operator= (const \fBpair\fP< _U1, _U2 > & __p)\fR [inline]\fP, \fR [constexpr]\fP, \fR [noexcept]\fP"

.PP
Converting assignment from a const \fRpair<U1, U2>\fP lvalue\&. 
.SS "template<typename _T1, typename _T2> const \fBpair\fP & \fBstd::pair\fP< _T1, _T2 >::operator= (\fBpair\fP< _T1, _T2 > && __p) const\fR [inline]\fP, \fR [constexpr]\fP"

.PP
Move assignment operator (const)\&. 
.SS "template<typename _T1, typename _T2> \fBpair\fP & \fBstd::pair\fP< _T1, _T2 >::operator= (\fBpair\fP< _T1, _T2 > && __p)\fR [inline]\fP, \fR [constexpr]\fP, \fR [noexcept]\fP"

.PP
Move assignment operator\&. 
.SS "template<typename _T1, typename _T2> template<typename _U1, typename _U2> 
.br
requires (_S_const_assignable<_U1, _U2>())const \fBpair\fP & \fBstd::pair\fP< _T1, _T2 >::operator= (\fBpair\fP< _U1, _U2 > && __p) const\fR [inline]\fP, \fR [constexpr]\fP"

.PP
Converting assignment from a non-const \fRpair<U1, U2>\fP rvalue\&. 
.SS "template<typename _T1, typename _T2> template<typename _U1, typename _U2> 
.br
requires (_S_assignable<_U1, _U2>())\fBpair\fP & \fBstd::pair\fP< _T1, _T2 >::operator= (\fBpair\fP< _U1, _U2 > && __p)\fR [inline]\fP, \fR [constexpr]\fP, \fR [noexcept]\fP"

.PP
Converting assignment from a non-const \fRpair<U1, U2>\fP rvalue\&. 
.SS "template<typename _T1, typename _T2> void \fBstd::pair\fP< _T1, _T2 >::swap (\fBpair\fP< _T1, _T2 > & __p)\fR [inline]\fP, \fR [constexpr]\fP, \fR [noexcept]\fP"

.PP
Swap the first members and then the second members\&. 
.SH "Member Data Documentation"
.PP 
.SS "template<typename _T1, typename _T2> _T1 \fBstd::pair\fP< _T1, _T2 >::first"

.PP
The first member\&. 
.SS "template<typename _T1, typename _T2> _T2 \fBstd::pair\fP< _T1, _T2 >::second"

.PP
The second member\&. 

.SH "Author"
.PP 
Generated automatically by Doxygen for libstdc++ from the source code\&.