STD::EXPERIMENTAL::_OPTIONAL_BASE(3cxx)

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✨ std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor > — 3cxx manual ✨

okay bestie, welcome to the manual page for this absolute C++ icon. She's the class template that holds the necessary state for Optional values and that has the responsibility for construction and the special members. 💅

💖 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. She's the backstage queen of optional, no cap. 👑

🌸 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. No cap. 🧚

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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