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

template<typename _Tp>¶

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

Definition at line 83 of file optional.