NAME

       std::experimental::optional< _Tp > -

SYNOPSIS

       Inherits std::experimental::_Optional_base< _Tp >, and std::_Enable_copy_move<
       is_copy_constructible< _Tp >::value, __and_< is_copy_constructible< _Tp >,
       is_copy_assignable< _Tp > >::value, is_move_constructible< _Tp >::value, __and_<
       is_move_constructible< _Tp >, is_move_assignable< _Tp > >::value, optional< _Tp > >.

   Public Types
       using value_type = _Tp

   Public Member Functions
       template<typename... _Args> void emplace (_Args &&...__args)
       template<typename _Up , typename... _Args> enable_if_t< is_constructible< _Tp,
           initializer_list< _Up > &, _Args &&... >::value > emplace (initializer_list< _Up >
           __il, _Args &&...__args)
       constexpr operator bool () const noexcept
       constexpr const _Tp & operator* () const &
       constexpr _Tp & operator* ()&
       constexpr _Tp && operator* ()&&
       constexpr const _Tp && operator* () const &&
       constexpr const _Tp * operator-> () const
       _Tp * operator-> ()
       optional & operator= (nullopt_t) noexcept
       template<typename _Up > enable_if_t< is_same< _Tp, decay_t< _Up > >::value, optional & >
           operator= (_Up &&__u)
       void swap (optional &__other) noexcept(is_nothrow_move_constructible< _Tp
           >()&&noexcept(swap(declval< _Tp & >(), declval< _Tp & >())))
       constexpr const _Tp & value () const &
       constexpr _Tp & value ()&
       constexpr _Tp && value ()&&
       constexpr const _Tp && value () const &&
       template<typename _Up > constexpr _Tp value_or (_Up &&__u) const &
       template<typename _Up > _Tp value_or (_Up &&__u)&&

   Private Member Functions
       void _M_construct (_Args &&...__args) noexcept(is_nothrow_constructible< _Stored_type,
           _Args... >())
       void _M_destruct ()
       constexpr _Tp & _M_get () noexcept
       constexpr const _Tp & _M_get () const noexcept
       constexpr bool _M_is_engaged () const noexcept
       void _M_reset ()

   Private Attributes
       _Empty_byte _M_empty
       _Stored_type _M_payload

Detailed Description

   template<typename _Tp>
       class std::experimental::optional< _Tp >" Class template for optional values.

       Definition at line 82 of file optional.

Author

       Generated automatically by Doxygen for libstdc++ from the source code.