std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor > - Class template that holds the

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libstdc++                                        Tue Jul std::experimental::_Opt...ouldProvideDestructor>(3cxx)

template<typename_Tp,bool_ShouldProvideDestructor=!is_trivially_destructible<_Tp>::value>
       class std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor >" Class template that holds the
       necessary state for Optionalvalues 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 _Optional_base implements the functionality for
       copy and move assignment, but not for converting assignment.

       Seealso
           optional, _Enable_special_members

       Definition at line 202 of file optional.

       std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor > - Class template that holds the
       necessary state for Optionalvalues and that has the responsibility for construction and the special
       members.

       Inherited by std::experimental::optional<_Tp> [private].

   PublicMemberFunctions_Optional_base (_Optional_base &&__other) noexcept(is_nothrow_move_constructible< _Tp >())
       _Optional_base (const _Optional_base &__other)
       template<typename... _Args> constexpr _Optional_base (in_place_t, _Args &&... __args)
       template<typename _Up , typename... _Args, enable_if_t< is_constructible< _Tp, initializer_list< _Up > &,
           _Args &&... >::value, int > ...> constexpr _Optional_base (in_place_t, initializer_list< _Up > __il,
           _Args &&... __args)
       constexpr _Optional_base (nullopt_t) noexcept
       _Optional_base & operator= (_Optional_base &&__other) noexcept(__and_< is_nothrow_move_constructible< _Tp
           >, is_nothrow_move_assignable< _Tp >>())
       _Optional_base & operator= (const _Optional_base &__other)

   ProtectedMemberFunctions
       template<typename... _Args> void _M_construct (_Args &&... __args) noexcept(is_nothrow_constructible<
           _Stored_type, _Args... >())
       void _M_destruct ()
       constexpr const _Tp & _M_get () const noexcept
       constexpr _Tp & _M_get () noexcept
       constexpr bool _M_is_engaged () const noexcept
       void _M_reset ()