.TH "std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor >" 3cxx "Tue Jul 2 2019" "libstdc++" \" -*- nroff -*-
.ad l
.nh
.SH NAME
std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor > \- Class template that holds the necessary state for \fBOptional values\fP and that has the responsibility for construction and the special members\&.  

.SH SYNOPSIS
.br
.PP
.SS "Public Member Functions"

.in +1c
.ti -1c
.RI "constexpr \fB_Optional_base\fP (\fBnullopt_t\fP) noexcept"
.br
.ti -1c
.RI "template<typename\&.\&.\&. _Args> constexpr \fB_Optional_base\fP (\fBin_place_t\fP, _Args &&\&.\&.\&. __args)"
.br
.ti -1c
.RI "template<typename _Up , typename\&.\&.\&. _Args, enable_if_t< is_constructible< _Tp, initializer_list< _Up > &, _Args &&\&.\&.\&. >::value, int > \&.\&.\&.> constexpr \fB_Optional_base\fP (\fBin_place_t\fP, \fBinitializer_list\fP< _Up > __il, _Args &&\&.\&.\&. __args)"
.br
.ti -1c
.RI "\fB_Optional_base\fP (const \fB_Optional_base\fP &__other)"
.br
.ti -1c
.RI "\fB_Optional_base\fP (\fB_Optional_base\fP &&__other) noexcept(\fBis_nothrow_move_constructible\fP< _Tp >())"
.br
.ti -1c
.RI "\fB_Optional_base\fP & \fBoperator=\fP (const \fB_Optional_base\fP &__other)"
.br
.ti -1c
.RI "\fB_Optional_base\fP & \fBoperator=\fP (\fB_Optional_base\fP &&__other) noexcept(__and_< \fBis_nothrow_move_constructible\fP< _Tp >, \fBis_nothrow_move_assignable\fP< _Tp >>())"
.br
.in -1c
.SS "Protected Member Functions"

.in +1c
.ti -1c
.RI "template<typename\&.\&.\&. _Args> void \fB_M_construct\fP (_Args &&\&.\&.\&. __args) noexcept(\fBis_nothrow_constructible\fP< _Stored_type, _Args\&.\&.\&. >())"
.br
.ti -1c
.RI "void \fB_M_destruct\fP ()"
.br
.ti -1c
.RI "constexpr _Tp & \fB_M_get\fP () noexcept"
.br
.ti -1c
.RI "constexpr const _Tp & \fB_M_get\fP () const noexcept"
.br
.ti -1c
.RI "constexpr bool \fB_M_is_engaged\fP () const noexcept"
.br
.ti -1c
.RI "void \fB_M_reset\fP ()"
.br
.in -1c
.SH "Detailed Description"
.PP 

.SS "template<typename _Tp, bool _ShouldProvideDestructor = !is_trivially_destructible<_Tp>::value>
.br
class std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor >"
Class template that holds the necessary state for \fBOptional values\fP and that has the responsibility for construction and the special members\&. 

Such a separate base class template is necessary in order to conditionally enable the special members (e\&.g\&. copy/move constructors)\&. Note that this means that \fB_Optional_base\fP implements the functionality for copy and move assignment, but not for converting assignment\&.
.PP
\fBSee also:\fP
.RS 4
optional, _Enable_special_members 
.RE
.PP

.PP
Definition at line 202 of file optional\&.

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