.TH "std::_Optional_base< _Tp, bool, bool >" 3cxx "libstdc++" \" -*- nroff -*-
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.SH NAME
std::_Optional_base< _Tp, bool, bool > \- Class template that provides copy/move constructors of optional\&.  

.SH SYNOPSIS
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.PP
.PP
\fC#include <optional>\fP
.PP
Inherits std::_Optional_base_impl< _Tp, _Dp >\&.
.PP
Inherited by \fBstd::experimental::fundamentals_v1::optional< _Tp >\fP\fC [private]\fP, and \fBstd::optional< _Tp >\fP\fC [private]\fP\&.
.SS "Public Member Functions"

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.RI "\fBconstexpr\fP \fB_Optional_base\fP (\fB_Optional_base\fP &&__other) \fBnoexcept\fP(is_nothrow_move_constructible_v< _Tp >)"
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.RI "\fBconstexpr\fP \fB_Optional_base\fP (\fBconst\fP \fB_Optional_base\fP &__other)"
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.RI "template<typename\&.\&.\&. _Args, \fBenable_if_t\fP< is_constructible_v< _Tp, _Args\&.\&.\&. >, bool >  = false> \fBconstexpr\fP \fB_Optional_base\fP (in_place_t, \fB_Args\fP &&\&.\&.\&. \fB__args\fP)"
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.RI "template<\fBtypename\fP _Up , typename\&.\&.\&. _Args, \fBenable_if_t\fP< is_constructible_v< _Tp, \fBinitializer_list\fP< _Up > &, _Args\&.\&.\&. >, bool >  = false> \fBconstexpr\fP \fB_Optional_base\fP (in_place_t, \fBinitializer_list\fP< _Up > \fB__il\fP, \fB_Args\fP &&\&.\&.\&. \fB__args\fP)"
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.RI "\fB_Optional_base\fP & \fBoperator=\fP (\fB_Optional_base\fP &&)=\fBdefault\fP"
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.RI "\fB_Optional_base\fP & \fBoperator=\fP (\fBconst\fP \fB_Optional_base\fP &)=\fBdefault\fP"
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.SS "Public Attributes"

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.RI "_Optional_payload< _Tp > \fB_M_payload\fP"
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.SS "Protected Types"

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.RI "\fBusing\fP \fB_Stored_type\fP = \fBremove_const_t\fP< _Tp >"
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.SS "Protected Member Functions"

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.RI "template<typename\&.\&.\&. _Args> \fBconstexpr\fP \fBvoid\fP \fB_M_construct\fP (\fB_Args\fP &&\&.\&.\&. \fB__args\fP) \fBnoexcept\fP(is_nothrow_constructible_v< \fB_Stored_type\fP, _Args\&.\&.\&. >)"
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.RI "\fBconstexpr\fP \fBvoid\fP \fB_M_destruct\fP () \fBnoexcept\fP"
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.RI "\fBconstexpr\fP \fBconst\fP _Tp & \fB_M_get\fP () \fBconst\fP \fBnoexcept\fP"
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.RI "\fBconstexpr\fP _Tp & \fB_M_get\fP () \fBnoexcept\fP"
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.RI "\fBconstexpr\fP bool \fB_M_is_engaged\fP () \fBconst\fP \fBnoexcept\fP"
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.RI "\fBconstexpr\fP \fBvoid\fP \fB_M_reset\fP () \fBnoexcept\fP"
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.SH "Detailed Description"
.PP 

.SS "template<\fBtypename\fP _Tp, bool = is_trivially_copy_constructible_v<_Tp>, bool = is_trivially_move_constructible_v<_Tp>>
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struct std::_Optional_base< _Tp, bool, bool >"Class template that provides copy/move constructors of optional\&. 

Such a separate base class template is necessary in order to conditionally make copy/move constructors trivial\&.
.PP
When the contained value is trivially copy/move constructible, the copy/move constructors of _Optional_base will invoke the trivial copy/move constructor of _Optional_payload\&. Otherwise, they will invoke _Optional_payload(bool, const _Optional_payload&) or _Optional_payload(bool, _Optional_payload&&) to initialize the contained value, if copying/moving an engaged optional\&.
.PP
Whether the other special members are trivial is determined by the _Optional_payload<_Tp> specialization used for the _M_payload member\&.
.PP
\fBSee also\fP
.RS 4
optional, _Enable_special_members 
.RE
.PP


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