Inheritance diagram for std::optional< _Tp >:

[legend]

Public Types
using	value_type = _Tp

Public Member Functions
template<typename _Up = _Tp, _Requires< __not_self< _Up >, __not_tag< _Up >, is_constructible< _Tp, _Up >, is_convertible< _Up, _Tp > > = true>
constexpr	optional (_Up &&__t) noexcept(is_nothrow_constructible_v< _Tp, _Up >)

template<typename _Up = _Tp, _Requires< __not_self< _Up >, __not_tag< _Up >, is_constructible< _Tp, _Up >, __not_< is_convertible< _Up, _Tp > > > = false>
constexpr	optional (_Up &&__t) noexcept(is_nothrow_constructible_v< _Tp, _Up >)

template<typename _Up , _Requires< __not_< is_same< _Tp, _Up > >, is_constructible< _Tp, const _Up & >, is_convertible< const _Up &, _Tp >, __not_< __converts_from_optional< _Tp, _Up > > > = true>
constexpr	optional (const optional< _Up > &__t) noexcept(is_nothrow_constructible_v< _Tp, const _Up & >)

template<typename _Up , _Requires< __not_< is_same< _Tp, _Up > >, is_constructible< _Tp, const _Up & >, __not_< is_convertible< const _Up &, _Tp > >, __not_< __converts_from_optional< _Tp, _Up > > > = false>
constexpr	optional (const optional< _Up > &__t) noexcept(is_nothrow_constructible_v< _Tp, const _Up & >)

template<typename... _Args, _Requires< is_constructible< _Tp, _Args... > > = false>
constexpr	optional (in_place_t, _Args &&... __args) noexcept(is_nothrow_constructible_v< _Tp, _Args... >)

template<typename _Up , typename... _Args, _Requires< is_constructible< _Tp, initializer_list< _Up > &, _Args... > > = false>
constexpr	optional (in_place_t, initializer_list< _Up > __il, _Args &&... __args) noexcept(is_nothrow_constructible_v< _Tp, initializer_list< _Up > &, _Args... >)

constexpr	optional (nullopt_t) noexcept

template<typename _Up , _Requires< __not_< is_same< _Tp, _Up > >, is_constructible< _Tp, _Up >, is_convertible< _Up, _Tp >, __not_< __converts_from_optional< _Tp, _Up > > > = true>
constexpr	optional (optional< _Up > &&__t) noexcept(is_nothrow_constructible_v< _Tp, _Up >)

template<typename _Up , _Requires< __not_< is_same< _Tp, _Up > >, is_constructible< _Tp, _Up >, __not_< is_convertible< _Up, _Tp > >, __not_< __converts_from_optional< _Tp, _Up > > > = false>
constexpr	optional (optional< _Up > &&__t) noexcept(is_nothrow_constructible_v< _Tp, _Up >)

template<typename... _Args>
constexpr enable_if_t< is_constructible_v< _Tp, _Args... >, _Tp & >	emplace (_Args &&... __args) noexcept(is_nothrow_constructible_v< _Tp, _Args... >)

template<typename _Up , typename... _Args>
constexpr enable_if_t< is_constructible_v< _Tp, initializer_list< _Up > &, _Args... >, _Tp & >	emplace (initializer_list< _Up > __il, _Args &&... __args) noexcept(is_nothrow_constructible_v< _Tp, initializer_list< _Up > &, _Args... >)

constexpr bool	has_value () const noexcept

constexpr	operator bool () const noexcept

constexpr _Tp &&	operator* () &&noexcept

constexpr _Tp &	operator* () &noexcept

constexpr const _Tp &&	operator* () const &&noexcept

constexpr const _Tp &	operator* () const &noexcept

constexpr const _Tp *	operator-> () const noexcept

constexpr _Tp *	operator-> () noexcept

template<typename _Up = _Tp>
constexpr enable_if_t< __and_v< __not_self< _Up >, __not_< __and_< is_scalar< _Tp >, is_same< _Tp, decay_t< _Up > > > >, is_constructible< _Tp, _Up >, is_assignable< _Tp &, _Up > >, optional & >	operator= (_Up &&__u) noexcept(__and_v< is_nothrow_constructible< _Tp, _Up >, is_nothrow_assignable< _Tp &, _Up > >)

template<typename _Up >
constexpr enable_if_t< __and_v< __not_< is_same< _Tp, _Up > >, is_constructible< _Tp, const _Up & >, is_assignable< _Tp &, const _Up & >, __not_< __converts_from_optional< _Tp, _Up > >, __not_< __assigns_from_optional< _Tp, _Up > > >, optional & >	operator= (const optional< _Up > &__u) noexcept(__and_v< is_nothrow_constructible< _Tp, const _Up & >, is_nothrow_assignable< _Tp &, const _Up & > >)

constexpr optional &	operator= (nullopt_t) noexcept

template<typename _Up >
constexpr enable_if_t< __and_v< __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 > > >, optional & >	operator= (optional< _Up > &&__u) noexcept(__and_v< is_nothrow_constructible< _Tp, _Up >, is_nothrow_assignable< _Tp &, _Up > >)

constexpr void	reset () noexcept

constexpr void	swap (optional &__other) noexcept(is_nothrow_move_constructible_v< _Tp > &&is_nothrow_swappable_v< _Tp >)

constexpr _Tp &	value () &

constexpr _Tp &&	value () &&

constexpr const _Tp &	value () const &

constexpr const _Tp &&	value () const &&

template<typename _Up >
constexpr _Tp	value_or (_Up &&__u) &&

template<typename _Up >
constexpr _Tp	value_or (_Up &&__u) const &

Detailed Description

template<typename _Tp>
class std::optional< _Tp >

Class template for optional values.

Definition at line 705 of file optional.

Member Typedef Documentation

◆ value_type

template<typename _Tp >

using std::optional< _Tp >::value_type = _Tp

Definition at line 735 of file optional.

Constructor & Destructor Documentation

◆ optional() [1/10]

template<typename _Tp >

constexpr std::optional< _Tp >::optional ( )

inlineconstexprnoexcept

Definition at line 737 of file optional.

◆ optional() [2/10]

template<typename _Tp >

constexpr std::optional< _Tp >::optional ( nullopt_t )

inlineconstexprnoexcept

Definition at line 739 of file optional.

◆ optional() [3/10]

template<typename _Tp >

template<typename _Up = _Tp, _Requires< __not_self< _Up >, __not_tag< _Up >, is_constructible< _Tp, _Up >, is_convertible< _Up, _Tp > > = true>

constexpr std::optional< _Tp >::optional ( _Up && __t )

inlineconstexprnoexcept

Definition at line 747 of file optional.

◆ optional() [4/10]

template<typename _Tp >

template<typename _Up = _Tp, _Requires< __not_self< _Up >, __not_tag< _Up >, is_constructible< _Tp, _Up >, __not_< is_convertible< _Up, _Tp > > > = false>

constexpr std::optional< _Tp >::optional ( _Up && __t )

inlineexplicitconstexprnoexcept

Definition at line 756 of file optional.

◆ optional() [5/10]

template<typename _Tp >

template<typename _Up , _Requires< __not_< is_same< _Tp, _Up > >, is_constructible< _Tp, const _Up & >, is_convertible< const _Up &, _Tp >, __not_< __converts_from_optional< _Tp, _Up > > > = true>

constexpr std::optional< _Tp >::optional ( const optional< _Up > & __t )

inlineconstexprnoexcept

Definition at line 766 of file optional.

◆ optional() [6/10]

template<typename _Tp >

template<typename _Up , _Requires< __not_< is_same< _Tp, _Up > >, is_constructible< _Tp, const _Up & >, __not_< is_convertible< const _Up &, _Tp > >, __not_< __converts_from_optional< _Tp, _Up > > > = false>

constexpr std::optional< _Tp >::optional ( const optional< _Up > & __t )

inlineexplicitconstexprnoexcept

Definition at line 779 of file optional.

◆ optional() [7/10]

template<typename _Tp >

template<typename _Up , _Requires< __not_< is_same< _Tp, _Up > >, is_constructible< _Tp, _Up >, is_convertible< _Up, _Tp >, __not_< __converts_from_optional< _Tp, _Up > > > = true>

constexpr std::optional< _Tp >::optional ( optional< _Up > && __t )

inlineconstexprnoexcept

Definition at line 792 of file optional.

◆ optional() [8/10]

template<typename _Tp >

template<typename _Up , _Requires< __not_< is_same< _Tp, _Up > >, is_constructible< _Tp, _Up >, __not_< is_convertible< _Up, _Tp > >, __not_< __converts_from_optional< _Tp, _Up > > > = false>

constexpr std::optional< _Tp >::optional ( optional< _Up > && __t )

inlineexplicitconstexprnoexcept

Definition at line 805 of file optional.

◆ optional() [9/10]

template<typename _Tp >

template<typename... _Args, _Requires< is_constructible< _Tp, _Args... > > = false>

constexpr std::optional< _Tp >::optional	(	in_place_t	,
		_Args &&...	__args
	)

inlineexplicitconstexprnoexcept

Definition at line 815 of file optional.

◆ optional() [10/10]

template<typename _Tp >

template<typename _Up , typename... _Args, _Requires< is_constructible< _Tp, initializer_list< _Up > &, _Args... > > = false>

constexpr std::optional< _Tp >::optional	(	in_place_t	,
		initializer_list< _Up >	__il,
		_Args &&...	__args
	)

inlineexplicitconstexprnoexcept

Definition at line 824 of file optional.

Member Function Documentation

◆ emplace() [1/2]

template<typename _Tp >

template<typename... _Args>

constexpr enable_if_t< is_constructible_v< _Tp, _Args... >, _Tp & > std::optional< _Tp >::emplace ( _Args &&... __args )

inlineconstexprnoexcept

Definition at line 914 of file optional.

◆ emplace() [2/2]

template<typename _Tp >

template<typename _Up , typename... _Args>

constexpr enable_if_t< is_constructible_v< _Tp, initializer_list< _Up > &, _Args... >, _Tp & > std::optional< _Tp >::emplace	(	initializer_list< _Up >	__il,
		_Args &&...	__args
	)

inlineconstexprnoexcept

Definition at line 926 of file optional.

◆ has_value()

template<typename _Tp >

constexpr bool std::optional< _Tp >::has_value ( ) const

inlineconstexprnoexcept

Definition at line 987 of file optional.

◆ operator bool()

template<typename _Tp >

constexpr std::optional< _Tp >::operator bool ( ) const

inlineexplicitconstexprnoexcept

Definition at line 984 of file optional.

◆ operator*() [1/4]

template<typename _Tp >

constexpr _Tp && std::optional< _Tp >::operator* ( ) &&

inlineconstexprnoexcept

Definition at line 977 of file optional.

◆ operator*() [2/4]

template<typename _Tp >

constexpr _Tp & std::optional< _Tp >::operator* ( ) &

inlineconstexprnoexcept

Definition at line 973 of file optional.

◆ operator*() [3/4]

template<typename _Tp >

constexpr const _Tp && std::optional< _Tp >::operator* ( ) const &&

inlineconstexprnoexcept

Definition at line 981 of file optional.

◆ operator*() [4/4]

template<typename _Tp >

constexpr const _Tp & std::optional< _Tp >::operator* ( ) const &

inlineconstexprnoexcept

Definition at line 969 of file optional.

◆ operator->() [1/2]

template<typename _Tp >

constexpr const _Tp * std::optional< _Tp >::operator-> ( ) const

inlineconstexprnoexcept

Definition at line 961 of file optional.

◆ operator->() [2/2]

template<typename _Tp >

constexpr _Tp * std::optional< _Tp >::operator-> ( )

inlineconstexprnoexcept

Definition at line 965 of file optional.

◆ operator=() [1/4]

template<typename _Tp >

template<typename _Up = _Tp>

constexpr enable_if_t< __and_v< __not_self< _Up >, __not_< __and_< is_scalar< _Tp >, is_same< _Tp, decay_t< _Up > > > >, is_constructible< _Tp, _Up >, is_assignable< _Tp &, _Up > >, optional & > std::optional< _Tp >::operator= ( _Up && __u )

inlineconstexprnoexcept

Definition at line 846 of file optional.

◆ operator=() [2/4]

template<typename _Tp >

template<typename _Up >

constexpr enable_if_t< __and_v< __not_< is_same< _Tp, _Up > >, is_constructible< _Tp, const _Up & >, is_assignable< _Tp &, const _Up & >, __not_< __converts_from_optional< _Tp, _Up > >, __not_< __assigns_from_optional< _Tp, _Up > > >, optional & > std::optional< _Tp >::operator= ( const optional< _Up > & __u )

inlineconstexprnoexcept

Definition at line 866 of file optional.

◆ operator=() [3/4]

template<typename _Tp >

constexpr optional & std::optional< _Tp >::operator= ( nullopt_t )

inlineconstexprnoexcept

Definition at line 832 of file optional.

◆ operator=() [4/4]

template<typename _Tp >

template<typename _Up >

constexpr enable_if_t< __and_v< __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 > > >, optional & > std::optional< _Tp >::operator= ( optional< _Up > && __u )

inlineconstexprnoexcept

Definition at line 892 of file optional.

◆ reset()

template<typename _Tp >

constexpr void std::optional< _Tp >::reset ( )

inlineconstexprnoexcept

Definition at line 1170 of file optional.

◆ swap()

template<typename _Tp >

constexpr void std::optional< _Tp >::swap ( optional< _Tp > & __other )

inlineconstexprnoexcept

Definition at line 939 of file optional.

◆ value() [1/4]

template<typename _Tp >

constexpr _Tp & std::optional< _Tp >::value ( ) &

inlineconstexpr

Definition at line 999 of file optional.

◆ value() [2/4]

template<typename _Tp >

constexpr _Tp && std::optional< _Tp >::value ( ) &&

inlineconstexpr

Definition at line 1007 of file optional.

◆ value() [3/4]

template<typename _Tp >

constexpr const _Tp & std::optional< _Tp >::value ( ) const &

inlineconstexpr

Definition at line 991 of file optional.

◆ value() [4/4]

template<typename _Tp >

constexpr const _Tp && std::optional< _Tp >::value ( ) const &&

inlineconstexpr

Definition at line 1015 of file optional.

◆ value_or() [1/2]

template<typename _Tp >

template<typename _Up >

constexpr _Tp std::optional< _Tp >::value_or ( _Up && __u ) &&

inlineconstexpr

Definition at line 1037 of file optional.

◆ value_or() [2/2]

template<typename _Tp >

template<typename _Up >

constexpr _Tp std::optional< _Tp >::value_or ( _Up && __u ) const &

inlineconstexpr

Definition at line 1024 of file optional.

Friends And Related Symbol Documentation

◆ optional

template<typename _Tp >

template<typename _Up >

friend class optional

friend

Definition at line 1174 of file optional.

The documentation for this class was generated from the following file:

optional

Public Types

Public Member Functions

Detailed Description

Member Typedef Documentation

◆ value_type

Constructor & Destructor Documentation

◆ optional() [1/10]

◆ optional() [2/10]

◆ optional() [3/10]

◆ optional() [4/10]

◆ optional() [5/10]

◆ optional() [6/10]

◆ optional() [7/10]

◆ optional() [8/10]

◆ optional() [9/10]

◆ optional() [10/10]

Member Function Documentation

◆ emplace() [1/2]

◆ emplace() [2/2]

◆ has_value()

◆ operator bool()

◆ operator*() [1/4]

◆ operator*() [2/4]

◆ operator*() [3/4]

◆ operator*() [4/4]

◆ operator->() [1/2]

◆ operator->() [2/2]

◆ operator=() [1/4]

◆ operator=() [2/4]

◆ operator=() [3/4]

◆ operator=() [4/4]

◆ reset()

◆ swap()

◆ value() [1/4]

◆ value() [2/4]

◆ value() [3/4]

◆ value() [4/4]

◆ value_or() [1/2]

◆ value_or() [2/2]

Friends And Related Symbol Documentation

◆ optional