std::_Optional_base< _Tp, bool, bostd::3Optional_base< _Tp, bool, bool >(3cxx)
NAME
std::_Optional_base< _Tp, bool, bool > - Class template that provides
copy/move constructors of optional.
SYNOPSIS
Inherits std::_Optional_base_impl< _Tp, _Dp >.
Inherited by std::experimental::fundamentals_v1::optional< _Tp >
[private], and std::optional< _Tp > [private].
Public Member Functions
constexpr _Optional_base (_Optional_base &&__other)
noexcept(is_nothrow_move_constructible_v< _Tp >)
constexpr _Optional_base (const _Optional_base &__other)
template<typename... _Args, enable_if_t< is_constructible_v< _Tp,
_Args... >, bool > = false> constexpr _Optional_base (in_place_t,
_Args &&... __args)
template<typename _Up , typename... _Args, enable_if_t<
is_constructible_v< _Tp, initializer_list< _Up > &, _Args... >,
bool > = false> constexpr _Optional_base (in_place_t,
initializer_list< _Up > __il, _Args &&... __args)
_Optional_base & operator= (_Optional_base &&)=default
_Optional_base & operator= (const _Optional_base &)=default
Public Attributes
_Optional_payload< _Tp > _M_payload
Protected Types
using _Stored_type = remove_const_t< _Tp >
Protected Member Functions
template<typename... _Args> constexpr void _M_construct (_Args &&...
__args) noexcept(is_nothrow_constructible_v< _Stored_type, _Args...
>)
constexpr void _M_destruct () noexcept
constexpr const _Tp & _M_get () const noexcept
constexpr _Tp & _M_get () noexcept
constexpr bool _M_is_engaged () const noexcept
constexpr void _M_reset () noexcept
Detailed Description
template<typename _Tp, bool = is_trivially_copy_constructible_v<_Tp>, bool
= is_trivially_move_constructible_v<_Tp>>
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.
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.
Whether the other special members are trivial is determined by the
_Optional_payload<_Tp> specialization used for the _M_payload member.
See also
optional, _Enable_special_members
Author
Generated automatically by Doxygen for libstdc++ from the source code.
libstdc++ Sastd::_Optional_base< _Tp, bool, bool >(3cxx)
Generated by dwww version 1.14 on Thu Jan 23 21:37:17 CET 2025.