NAME

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

SYNOPSIS

       #include <optional>

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

   Public Member Functions
       _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)

   Protected Member Functions
       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 ()

Detailed Description

   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 Optional values 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.

       See also
           optional, _Enable_special_members

       Definition at line 202 of file optional.

Constructor & Destructor Documentation

   template<typename _Tp , bool _ShouldProvideDestructor = !is_trivially_destructible<_Tp>::value> constexpr
       std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor >::_Optional_base () [inline],
       [constexpr],  [noexcept]
       Definition at line 214 of file optional.

   template<typename _Tp , bool _ShouldProvideDestructor = !is_trivially_destructible<_Tp>::value> constexpr
       std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor >::_Optional_base (nullopt_t) [inline],
       [constexpr],  [noexcept]
       Definition at line 217 of file optional.

   template<typename _Tp , bool _ShouldProvideDestructor = !is_trivially_destructible<_Tp>::value>
       template<typename... _Args> constexpr std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor
       >::_Optional_base (in_place_t, _Args &&... __args) [inline],  [explicit],  [constexpr]
       Definition at line 222 of file optional.

   template<typename _Tp , bool _ShouldProvideDestructor = !is_trivially_destructible<_Tp>::value>
       template<typename _Up , typename... _Args, enable_if_t< is_constructible< _Tp, initializer_list< _Up > &,
       _Args &&... >::value, int > ...> constexpr std::experimental::_Optional_base< _Tp,
       _ShouldProvideDestructor >::_Optional_base (in_place_t, initializer_list< _Up > __il, _Args &&... __args)
       [inline],  [explicit],  [constexpr]
       Definition at line 230 of file optional.

   template<typename _Tp , bool _ShouldProvideDestructor = !is_trivially_destructible<_Tp>::value>
       std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor >::_Optional_base (const _Optional_base<
       _Tp, _ShouldProvideDestructor > & __other) [inline]
       Definition at line 237 of file optional.

   template<typename _Tp , bool _ShouldProvideDestructor = !is_trivially_destructible<_Tp>::value>
       std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor >::_Optional_base (_Optional_base< _Tp,
       _ShouldProvideDestructor > && __other) [inline],  [noexcept]
       Definition at line 243 of file optional.

   template<typename _Tp , bool _ShouldProvideDestructor = !is_trivially_destructible<_Tp>::value>
       std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor >::~_Optional_base () [inline]
       Definition at line 285 of file optional.

Member Function Documentation

   template<typename _Tp , bool _ShouldProvideDestructor = !is_trivially_destructible<_Tp>::value>
       template<typename... _Args> void std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor
       >::_M_construct (_Args &&... __args) [inline],  [protected],  [noexcept]
       Definition at line 310 of file optional.

   template<typename _Tp , bool _ShouldProvideDestructor = !is_trivially_destructible<_Tp>::value> void
       std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor >::_M_destruct () [inline],  [protected]

       Definition at line 319 of file optional.

   template<typename _Tp , bool _ShouldProvideDestructor = !is_trivially_destructible<_Tp>::value> constexpr
       const _Tp & std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor >::_M_get () const [inline],
       [constexpr],  [protected],  [noexcept]
       Definition at line 303 of file optional.

   template<typename _Tp , bool _ShouldProvideDestructor = !is_trivially_destructible<_Tp>::value> constexpr _Tp
       & std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor >::_M_get () [inline],  [constexpr],
       [protected],  [noexcept]
       Definition at line 299 of file optional.

   template<typename _Tp , bool _ShouldProvideDestructor = !is_trivially_destructible<_Tp>::value> constexpr
       bool std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor >::_M_is_engaged () const [inline],
       [constexpr],  [protected],  [noexcept]
       Definition at line 294 of file optional.

   template<typename _Tp , bool _ShouldProvideDestructor = !is_trivially_destructible<_Tp>::value> void
       std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor >::_M_reset () [inline],  [protected]
       Definition at line 327 of file optional.

   template<typename _Tp , bool _ShouldProvideDestructor = !is_trivially_destructible<_Tp>::value>
       _Optional_base & std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor >::operator=
       (_Optional_base< _Tp, _ShouldProvideDestructor > && __other) [inline],  [noexcept]
       Definition at line 268 of file optional.

   template<typename _Tp , bool _ShouldProvideDestructor = !is_trivially_destructible<_Tp>::value>
       _Optional_base & std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor >::operator= (const
       _Optional_base< _Tp, _ShouldProvideDestructor > & __other) [inline]
       Definition at line 252 of file optional.

Member Data Documentation

   template<typename _Tp , bool _ShouldProvideDestructor = !is_trivially_destructible<_Tp>::value> _Empty_byte
       std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor >::_M_empty
       Definition at line 336 of file optional.

   template<typename _Tp , bool _ShouldProvideDestructor = !is_trivially_destructible<_Tp>::value> _Stored_type
       std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor >::_M_payload
       Definition at line 337 of file optional.

Author

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