.TH "std::experimental::optional< _Tp >" 3cxx "Sun Feb 7 2021" "libstdc++" \" -*- nroff -*-
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.SH NAME
std::experimental::optional< _Tp > \- Class template for optional values\&.  

.SH SYNOPSIS
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.PP
.PP
Inherits \fBstd::experimental::_Optional_base< _Tp, _ShouldProvideDestructor >\fP, and \fBstd::_Enable_copy_move< is_copy_constructible< _Tp >::value, __and_< is_copy_constructible< _Tp >, is_copy_assignable< _Tp > >::value, is_move_constructible< _Tp >::value, __and_< is_move_constructible< _Tp >, is_move_assignable< _Tp > >::value, optional< _Tp > >\fP\&.
.SS "Public Types"

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.RI "using \fBvalue_type\fP = _Tp"
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.SS "Public Member Functions"

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.RI "template<typename _Up  = _Tp, enable_if_t< __and_< __not_< is_same< optional< _Tp >, decay_t< _Up >>>, is_constructible< _Tp, _Up && >, is_convertible< _Up &&, _Tp > >::value, bool >  = true> constexpr \fBoptional\fP (_Up &&__t)"
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.RI "template<typename _Up  = _Tp, enable_if_t< __and_< __not_< is_same< optional< _Tp >, decay_t< _Up >>>, is_constructible< _Tp, _Up && >, __not_< is_convertible< _Up &&, _Tp >> >::value, bool >  = false> constexpr \fBoptional\fP (_Up &&__t)"
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.RI "template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>, is_constructible< _Tp, const _Up & >, is_convertible< const _Up &, _Tp >, __not_< __converts_from_optional< _Tp, _Up >> >::value, bool >  = true> constexpr \fBoptional\fP (const \fBoptional\fP< _Up > &__t)"
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.RI "template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>, is_constructible< _Tp, const _Up & >, __not_< is_convertible< const _Up &, _Tp >>, __not_< __converts_from_optional< _Tp, _Up >> >::value, bool >  = false> constexpr \fBoptional\fP (const \fBoptional\fP< _Up > &__t)"
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.RI "template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>, is_constructible< _Tp, _Up && >, is_convertible< _Up &&, _Tp >, __not_< __converts_from_optional< _Tp, _Up >> >::value, bool >  = true> constexpr \fBoptional\fP (\fBoptional\fP< _Up > &&__t)"
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.RI "template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>, is_constructible< _Tp, _Up && >, __not_< is_convertible< _Up &&, _Tp >>, __not_< __converts_from_optional< _Tp, _Up >> >::value, bool >  = false> constexpr \fBoptional\fP (\fBoptional\fP< _Up > &&__t)"
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.RI "template<typename\&.\&.\&. _Args> \fBenable_if_t\fP< \fBis_constructible\fP< _Tp, _Args &&\&.\&.\&. >::value > \fBemplace\fP (_Args &&\&.\&.\&. __args)"
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.RI "template<typename _Up , typename\&.\&.\&. _Args> \fBenable_if_t\fP< \fBis_constructible\fP< _Tp, \fBinitializer_list\fP< _Up > &, _Args &&\&.\&.\&. >::value > \fBemplace\fP (\fBinitializer_list\fP< _Up > __il, _Args &&\&.\&.\&. __args)"
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.RI "constexpr \fBoperator bool\fP () const noexcept"
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.RI "constexpr _Tp & \fBoperator*\fP () &"
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.RI "constexpr _Tp && \fBoperator*\fP () &&"
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.RI "constexpr const _Tp & \fBoperator*\fP () const &"
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.RI "constexpr const _Tp && \fBoperator*\fP () const &&"
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.RI "_Tp * \fBoperator\->\fP ()"
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.RI "constexpr const _Tp * \fBoperator\->\fP () const"
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.RI "template<typename _Up  = _Tp> \fBenable_if_t\fP< __and_< __not_< \fBis_same\fP< \fBoptional\fP< _Tp >, \fBdecay_t\fP< _Up > > >, \fBis_constructible\fP< _Tp, _Up >, __not_< __and_< \fBis_scalar\fP< _Tp >, \fBis_same\fP< _Tp, \fBdecay_t\fP< _Up > > > >, \fBis_assignable\fP< _Tp &, _Up > >::value, \fBoptional\fP & > \fBoperator=\fP (_Up &&__u)"
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.RI "template<typename _Up > \fBenable_if_t\fP< __and_< __not_< \fBis_same\fP< _Tp, _Up > >, \fBis_constructible\fP< _Tp, const _Up & >, \fBis_assignable\fP< _Tp &, _Up >, __not_< __converts_from_optional< _Tp, _Up > >, __not_< __assigns_from_optional< _Tp, _Up > > >::value, \fBoptional\fP & > \fBoperator=\fP (const \fBoptional\fP< _Up > &__u)"
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.RI "\fBoptional\fP & \fBoperator=\fP (\fBnullopt_t\fP) noexcept"
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.RI "template<typename _Up > \fBenable_if_t\fP< __and_< __not_< \fBis_same\fP< _Tp, _Up > >, \fBis_constructible\fP< _Tp, _Up >, \fBis_assignable\fP< _Tp &, _Up >, __not_< __converts_from_optional< _Tp, _Up > >, __not_< __assigns_from_optional< _Tp, _Up > > >::value, \fBoptional\fP & > \fBoperator=\fP (\fBoptional\fP< _Up > &&__u)"
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.RI "void \fBswap\fP (\fBoptional\fP &__other) noexcept(\fBis_nothrow_move_constructible\fP< _Tp >() &&__is_nothrow_swappable< _Tp >::value)"
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.RI "constexpr _Tp & \fBvalue\fP () &"
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.RI "constexpr _Tp && \fBvalue\fP () &&"
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.RI "constexpr const _Tp & \fBvalue\fP () const &"
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.RI "constexpr const _Tp && \fBvalue\fP () const &&"
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.RI "template<typename _Up > _Tp \fBvalue_or\fP (_Up &&__u) &&"
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.RI "template<typename _Up > constexpr _Tp \fBvalue_or\fP (_Up &&__u) const &"
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.SH "Detailed Description"
.PP 

.SS "template<typename _Tp>
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class std::experimental::optional< _Tp >"
Class template for optional values\&. 
.PP
Definition at line 491 of file optional\&.

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