std::_Optional_base< _Tp, bool, bool >(3)

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], std::optional< _Tp > [private], and std::ranges::__detail::__non_propagating_cache< _Tp > [protected].

  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

Definition at line 510 of file std/optional.

Member Typedef Documentation

  template<typename _Tp , typename _Dp > using std::_Optional_base_impl< _Tp, _Dp >::_Stored_type = remove_const_t<_Tp> [protected], [inherited]

Definition at line 448 of file std/optional.

Constructor & Destructor Documentation

  template<typename _Tp , bool = is_trivially_copy_constructible_v<_Tp>, bool = is_trivially_move_constructible_v<_Tp>> template<typename... _Args, enable_if_t< is_constructible_v< _Tp, _Args... >, bool > = false> constexpr std::_Optional_base< _Tp, bool, bool >::_Optional_base (in_place_t, _Args &&... __args) [inline], [explicit], [constexpr]

Definition at line 520 of file std/optional.

  template<typename _Tp , bool = is_trivially_copy_constructible_v<_Tp>, bool = is_trivially_move_constructible_v<_Tp>> template<typename _Up , typename... _Args, enable_if_t< is_constructible_v< _Tp, initializer_list< _Up > &, _Args... >, bool > = false> constexpr std::_Optional_base< _Tp, bool, bool >::_Optional_base (in_place_t, initializer_list< _Up > __il, _Args &&... __args) [inline], [explicit], [constexpr]

Definition at line 529 of file std/optional.

  template<typename _Tp , bool = is_trivially_copy_constructible_v<_Tp>, bool = is_trivially_move_constructible_v<_Tp>> constexpr std::_Optional_base< _Tp, bool, bool >::_Optional_base (const _Optional_base< _Tp, bool, bool > & __other) [inline], [constexpr]

Definition at line 537 of file std/optional.

  template<typename _Tp , bool = is_trivially_copy_constructible_v<_Tp>, bool = is_trivially_move_constructible_v<_Tp>> constexpr std::_Optional_base< _Tp, bool, bool >::_Optional_base (_Optional_base< _Tp, bool, bool > && __other) [inline], [constexpr], [noexcept]

Definition at line 542 of file std/optional.

Member Function Documentation

  template<typename _Tp , typename _Dp > template<typename... _Args> constexpr void std::_Optional_base_impl< _Tp, _Dp >::_M_construct (_Args &&... __args) [inline], [constexpr], [protected], [noexcept], [inherited]

Definition at line 454 of file std/optional.

  template<typename _Tp , typename _Dp > constexpr void std::_Optional_base_impl< _Tp, _Dp >::_M_destruct () [inline], [constexpr], [protected], [noexcept], [inherited]

Definition at line 462 of file std/optional.

  template<typename _Tp , typename _Dp > constexpr const _Tp & std::_Optional_base_impl< _Tp, _Dp >::_M_get () const [inline], [constexpr], [protected], [noexcept], [inherited]

Definition at line 482 of file std/optional.

  template<typename _Tp , typename _Dp > constexpr _Tp & std::_Optional_base_impl< _Tp, _Dp >::_M_get () [inline], [constexpr], [protected], [noexcept], [inherited]

Definition at line 475 of file std/optional.

  template<typename _Tp , typename _Dp > constexpr bool std::_Optional_base_impl< _Tp, _Dp >::_M_is_engaged () const [inline], [constexpr], [protected], [noexcept], [inherited]

Definition at line 470 of file std/optional.

  template<typename _Tp , typename _Dp > constexpr void std::_Optional_base_impl< _Tp, _Dp >::_M_reset () [inline], [constexpr], [protected], [noexcept], [inherited]

Definition at line 467 of file std/optional.

Member Data Documentation

  template<typename _Tp , bool = is_trivially_copy_constructible_v<_Tp>, bool = is_trivially_move_constructible_v<_Tp>> _Optional_payload<_Tp> std::_Optional_base< _Tp, bool, bool >::_M_payload

Definition at line 552 of file std/optional.

Author

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