std::experimental::optional man page

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

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 _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>, is_constructible< _Tp, _Up &&>, is_convertible< _Up &&, _Tp > >::value, bool > = true> constexpr optional (_Up &&__t)

template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>, is_constructible< _Tp, _Up &&>, __not_< is_convertible< _Up &&, _Tp >> >::value, bool > = false> constexpr optional (_Up &&__t)

template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>, __not_< is_constructible< _Tp, const optional< _Up > &>>, __not_< is_convertible< const optional< _Up > &, _Tp >>, is_constructible< _Tp, const _Up &>, is_convertible< const _Up &, _Tp > >::value, bool > = true> constexpr optional (const optional< _Up > &__t)

template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>, __not_< is_constructible< _Tp, const optional< _Up > &>>, __not_< is_convertible< const optional< _Up > &, _Tp >>, is_constructible< _Tp, const _Up &>, __not_< is_convertible< const _Up &, _Tp >> >::value, bool > = false> constexpr optional (const optional< _Up > &__t)

template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>, __not_< is_constructible< _Tp, optional< _Up > &&>>, __not_< is_convertible< optional< _Up > &&, _Tp >>, is_constructible< _Tp, _Up &&>, is_convertible< _Up &&, _Tp > >::value, bool > = true> constexpr optional (optional< _Up > &&__t)

template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>, __not_< is_constructible< _Tp, optional< _Up > &&>>, __not_< is_convertible< optional< _Up > &&, _Tp >>, is_constructible< _Tp, _Up &&>, __not_< is_convertible< _Up &&, _Tp >> >::value, bool > = false> constexpr optional (optional< _Up > &&__t)

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< __and_< __not_< is_same< _Up, nullopt_t >>, __not_< __is_optional< _Up >>>::value, bool > = true> optional & operator= (_Up &&__u)

template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>>::value, bool > = true> optional & operator= (const optional< _Up > &__u)

template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>>::value, bool > = true> optional & operator= (optional< _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

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Info

Fri Sep 16 2016 libstdc++