bionic (3) std::experimental::optional.3cxx.gz

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 83 of file optional.

Author

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