Provided by: libstdc++-9-doc_9.5.0-6ubuntu2_all 
NAME
std::experimental::optional< _Tp > - Class template for optional values.
SYNOPSIS
#include <optional>
Inherits std::experimental::_Optional_base< _Tp, _ShouldProvideDestructor >, 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 = _Tp, enable_if_t< __and_< __not_< is_same< optional< _Tp >, decay_t< _Up > > >,
is_constructible< _Tp, _Up && >, is_convertible< _Up &&, _Tp > >::value, bool > = true> constexpr
optional (_Up &&__t)
template<typename _Up = _Tp, enable_if_t< __and_< __not_< is_same< optional< _Tp >, decay_t< _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 > >, is_constructible< _Tp, const
_Up & >, is_convertible< const _Up &, _Tp >, __not_< __converts_from_optional< _Tp, _Up > > >::value,
bool > = true> constexpr optional (const optional< _Up > &__t)
template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up > >, is_constructible< _Tp, const
_Up & >, __not_< is_convertible< const _Up &, _Tp > >, __not_< __converts_from_optional< _Tp, _Up > >
>::value, bool > = false> constexpr optional (const optional< _Up > &__t)
template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up > >, is_constructible< _Tp, _Up &&
>, is_convertible< _Up &&, _Tp >, __not_< __converts_from_optional< _Tp, _Up > > >::value, bool > =
true> constexpr optional (optional< _Up > &&__t)
template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up > >, is_constructible< _Tp, _Up &&
>, __not_< is_convertible< _Up &&, _Tp > >, __not_< __converts_from_optional< _Tp, _Up > > >::value,
bool > = false> constexpr optional (optional< _Up > &&__t)
template<typename... _Args> enable_if_t< is_constructible< _Tp, _Args &&... >::value > 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 _Tp & operator* () &
constexpr _Tp && operator* () &&
constexpr const _Tp & operator* () const &
constexpr const _Tp && operator* () const &&
_Tp * operator-> ()
constexpr const _Tp * operator-> () const
template<typename _Up = _Tp> enable_if_t< __and_< __not_< is_same< optional< _Tp >, decay_t< _Up > > >,
is_constructible< _Tp, _Up >, __not_< __and_< is_scalar< _Tp >, is_same< _Tp, decay_t< _Up > > > >,
is_assignable< _Tp &, _Up > >::value, optional & > operator= (_Up &&__u)
template<typename _Up > enable_if_t< __and_< __not_< is_same< _Tp, _Up > >, is_constructible< _Tp, const
_Up & >, is_assignable< _Tp &, _Up >, __not_< __converts_from_optional< _Tp, _Up > >, __not_<
__assigns_from_optional< _Tp, _Up > > >::value, optional & > operator= (const optional< _Up > &__u)
optional & operator= (nullopt_t) noexcept
template<typename _Up > enable_if_t< __and_< __not_< is_same< _Tp, _Up > >, is_constructible< _Tp, _Up >,
is_assignable< _Tp &, _Up >, __not_< __converts_from_optional< _Tp, _Up > >, __not_<
__assigns_from_optional< _Tp, _Up > > >::value, optional & > operator= (optional< _Up > &&__u)
void swap (optional &__other) noexcept(is_nothrow_move_constructible< _Tp >() &&__is_nothrow_swappable<
_Tp >::value)
constexpr _Tp & value () &
constexpr _Tp && value () &&
constexpr const _Tp & value () const &
constexpr const _Tp && value () const &&
template<typename _Up > _Tp value_or (_Up &&__u) &&
template<typename _Up > constexpr _Tp value_or (_Up &&__u) const &
Detailed Description
template<typename _Tp>
class std::experimental::optional< _Tp >"Class template for optional values.
Definition at line 491 of file optional.
Member Typedef Documentation
template<typename _Tp > using std::experimental::optional< _Tp >::value_type = _Tp
Definition at line 514 of file optional.
Constructor & Destructor Documentation
template<typename _Tp > template<typename _Up = _Tp, enable_if_t< __and_< __not_< is_same< optional< _Tp >,
decay_t< _Up > > >, is_constructible< _Tp, _Up && >, is_convertible< _Up &&, _Tp > >::value, bool > =
true> constexpr std::experimental::optional< _Tp >::optional (_Up && __t) [inline], [constexpr]
Definition at line 527 of file optional.
template<typename _Tp > template<typename _Up = _Tp, enable_if_t< __and_< __not_< is_same< optional< _Tp >,
decay_t< _Up > > >, is_constructible< _Tp, _Up && >, __not_< is_convertible< _Up &&, _Tp > > >::value,
bool > = false> constexpr std::experimental::optional< _Tp >::optional (_Up && __t) [inline],
[explicit], [constexpr]
Definition at line 536 of file optional.
template<typename _Tp > template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up > >,
is_constructible< _Tp, const _Up & >, is_convertible< const _Up &, _Tp >, __not_<
__converts_from_optional< _Tp, _Up > > >::value, bool > = true> constexpr std::experimental::optional<
_Tp >::optional (const optional< _Up > & __t) [inline], [constexpr]
Definition at line 546 of file optional.
template<typename _Tp > template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up > >,
is_constructible< _Tp, const _Up & >, __not_< is_convertible< const _Up &, _Tp > >, __not_<
__converts_from_optional< _Tp, _Up > > >::value, bool > = false> constexpr std::experimental::optional<
_Tp >::optional (const optional< _Up > & __t) [inline], [explicit], [constexpr]
Definition at line 559 of file optional.
template<typename _Tp > template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up > >,
is_constructible< _Tp, _Up && >, is_convertible< _Up &&, _Tp >, __not_< __converts_from_optional< _Tp,
_Up > > >::value, bool > = true> constexpr std::experimental::optional< _Tp >::optional (optional< _Up >
&& __t) [inline], [constexpr]
Definition at line 572 of file optional.
template<typename _Tp > template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up > >,
is_constructible< _Tp, _Up && >, __not_< is_convertible< _Up &&, _Tp > >, __not_<
__converts_from_optional< _Tp, _Up > > >::value, bool > = false> constexpr std::experimental::optional<
_Tp >::optional (optional< _Up > && __t) [inline], [explicit], [constexpr]
Definition at line 585 of file optional.
Member Function Documentation
template<typename _Tp > template<typename... _Args> enable_if_t< is_constructible< _Tp, _Args &&... >::value
> std::experimental::optional< _Tp >::emplace (_Args &&... __args) [inline]
Definition at line 670 of file optional.
template<typename _Tp > template<typename _Up , typename... _Args> enable_if_t< is_constructible< _Tp,
initializer_list< _Up > &, _Args &&... >::value > std::experimental::optional< _Tp >::emplace
(initializer_list< _Up > __il, _Args &&... __args) [inline]
Definition at line 679 of file optional.
template<typename _Tp > constexpr std::experimental::optional< _Tp >::operator bool () const [inline],
[explicit], [constexpr], [noexcept]
Definition at line 740 of file optional.
template<typename _Tp > constexpr _Tp & std::experimental::optional< _Tp >::operator* () & [inline],
[constexpr]
Definition at line 729 of file optional.
template<typename _Tp > constexpr _Tp && std::experimental::optional< _Tp >::operator* () && [inline],
[constexpr]
Definition at line 733 of file optional.
template<typename _Tp > constexpr const _Tp & std::experimental::optional< _Tp >::operator* () const &
[inline], [constexpr]
Definition at line 725 of file optional.
template<typename _Tp > constexpr const _Tp && std::experimental::optional< _Tp >::operator* () const &&
[inline], [constexpr]
Definition at line 737 of file optional.
template<typename _Tp > _Tp * std::experimental::optional< _Tp >::operator-> () [inline]
Definition at line 721 of file optional.
template<typename _Tp > constexpr const _Tp * std::experimental::optional< _Tp >::operator-> () const
[inline], [constexpr]
Definition at line 711 of file optional.
template<typename _Tp > template<typename _Up = _Tp> enable_if_t< __and_< __not_< is_same< optional< _Tp >,
decay_t< _Up > > >, is_constructible< _Tp, _Up >, __not_< __and_< is_scalar< _Tp >, is_same< _Tp,
decay_t< _Up > > > >, is_assignable< _Tp &, _Up > >::value, optional & > std::experimental::optional< _Tp
>::operator= (_Up && __u) [inline]
Definition at line 607 of file optional.
template<typename _Tp > template<typename _Up > enable_if_t< __and_< __not_< is_same< _Tp, _Up > >,
is_constructible< _Tp, const _Up & >, is_assignable< _Tp &, _Up >, __not_< __converts_from_optional< _Tp,
_Up > >, __not_< __assigns_from_optional< _Tp, _Up > > >::value, optional & >
std::experimental::optional< _Tp >::operator= (const optional< _Up > & __u) [inline]
Definition at line 626 of file optional.
template<typename _Tp > optional & std::experimental::optional< _Tp >::operator= (nullopt_t) [inline],
[noexcept]
Definition at line 593 of file optional.
template<typename _Tp > template<typename _Up > enable_if_t< __and_< __not_< is_same< _Tp, _Up > >,
is_constructible< _Tp, _Up >, is_assignable< _Tp &, _Up >, __not_< __converts_from_optional< _Tp, _Up >
>, __not_< __assigns_from_optional< _Tp, _Up > > >::value, optional & > std::experimental::optional< _Tp
>::operator= (optional< _Up > && __u) [inline]
Definition at line 651 of file optional.
template<typename _Tp > void std::experimental::optional< _Tp >::swap (optional< _Tp > & __other) [inline],
[noexcept]
Definition at line 689 of file optional.
template<typename _Tp > constexpr _Tp & std::experimental::optional< _Tp >::value () & [inline], [constexpr]
Definition at line 754 of file optional.
template<typename _Tp > constexpr _Tp && std::experimental::optional< _Tp >::value () && [inline],
[constexpr]
Definition at line 764 of file optional.
template<typename _Tp > constexpr const _Tp & std::experimental::optional< _Tp >::value () const & [inline],
[constexpr]
Definition at line 744 of file optional.
template<typename _Tp > constexpr const _Tp && std::experimental::optional< _Tp >::value () const &&
[inline], [constexpr]
Definition at line 774 of file optional.
template<typename _Tp > template<typename _Up > _Tp std::experimental::optional< _Tp >::value_or (_Up && __u)
&& [inline]
Definition at line 798 of file optional.
template<typename _Tp > template<typename _Up > constexpr _Tp std::experimental::optional< _Tp >::value_or
(_Up && __u) const & [inline], [constexpr]
Definition at line 785 of file optional.
Author
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