sol::optional< T & > Class Template Reference

#include <sol.hpp>

Public Types
using	value_type = T &

Public Member Functions
template<class F >
SOL_TL_OPTIONAL_11_CONSTEXPR detail::invoke_result_t< F, T & >	and_then (F &&f) &
template<class F >
SOL_TL_OPTIONAL_11_CONSTEXPR detail::invoke_result_t< F, T & >	and_then (F &&f) &&
template<class F >
constexpr detail::invoke_result_t< F, const T & >	and_then (F &&f) const &
template<class F >
constexpr detail::invoke_result_t< F, const T & >	and_then (F &&f) const &&
template<class U >
constexpr optional< typename std::decay< U >::type >	conjunction (U &&u) const
SOL_TL_OPTIONAL_11_CONSTEXPR optional	disjunction (const optional &rhs) &
constexpr optional	disjunction (const optional &rhs) const &
	disjunction More...
SOL_TL_OPTIONAL_11_CONSTEXPR optional	disjunction (const optional &rhs) &&
	disjunction More...
constexpr optional	disjunction (const optional &rhs) const &&
	disjunction More...
SOL_TL_OPTIONAL_11_CONSTEXPR optional	disjunction (optional &&rhs) &
	disjunction More...
constexpr optional	disjunction (optional &&rhs) const &
	disjunction More...
SOL_TL_OPTIONAL_11_CONSTEXPR optional	disjunction (optional &&rhs) &&
	disjunction More...
constexpr optional	disjunction (optional &&rhs) const &&
	disjunction More...
template<class... Args>
T &	emplace (Args &&... args) noexcept
constexpr bool	has_value () const noexcept
template<class F , class U >
U	map_or (F &&f, U &&u) &
	Maps the stored value with f if there is one, otherwise returns u. More...
template<class F , class U >
U	map_or (F &&f, U &&u) &&
	map_or More...
template<class F , class U >
U	map_or (F &&f, U &&u) const &
	map_or More...
template<class F , class U >
U	map_or (F &&f, U &&u) const &&
	map_or More...
template<class F , class U >
detail::invoke_result_t< U >	map_or_else (F &&f, U &&u) &
	Maps the stored value with f if there is one, otherwise calls u and returns the result. More...
template<class F , class U >
detail::invoke_result_t< U >	map_or_else (F &&f, U &&u) &&
template<class F , class U >
detail::invoke_result_t< U >	map_or_else (F &&f, U &&u) const &
template<class F , class U >
detail::invoke_result_t< U >	map_or_else (F &&f, U &&u) const &&
constexpr	operator bool () const noexcept
	has_value More...
SOL_TL_OPTIONAL_11_CONSTEXPR T &	operator* ()
constexpr const T &	operator* () const
constexpr const T *	operator-> () const
SOL_TL_OPTIONAL_11_CONSTEXPR T *	operator-> ()
optional &	operator= (nullopt_t) noexcept
optional &	operator= (const optional &rhs)=default
template<class U = T, detail::enable_if_t<!detail::is_optional< detail::decay_t< U >>::value > * = nullptr>
optional &	operator= (U &&u)
template<class U >
optional &	operator= (const optional< U > &rhs)
constexpr	optional () noexcept
constexpr	optional (nullopt_t) noexcept
	ctor_empty More...
SOL_TL_OPTIONAL_11_CONSTEXPR	optional (const optional &rhs) noexcept=default
SOL_TL_OPTIONAL_11_CONSTEXPR	optional (optional &&rhs)=default
template<class U = T, detail::enable_if_t<!detail::is_optional< detail::decay_t< U >>::value > * = nullptr>
constexpr	optional (U &&u)
template<class U >
constexpr	optional (const optional< U > &rhs)
template<class F , detail::enable_if_ret_void< F > * = nullptr>
optional< T > SOL_TL_OPTIONAL_11_CONSTEXPR	or_else (F &&f) &
	Calls f if the optional is empty std::invoke_result_t<F> must be void or convertible to optional<T>. If *this has a value, returns *this. Otherwise, if f returns void, calls std::forward<F>(f) and returns std::nullopt. Otherwise, returns std::forward<F>(f)(). More...
template<class F , detail::disable_if_ret_void< F > * = nullptr>
optional< T > SOL_TL_OPTIONAL_11_CONSTEXPR	or_else (F &&f) &
template<class F , detail::enable_if_ret_void< F > * = nullptr>
optional< T >	or_else (F &&f) &&
template<class F , detail::disable_if_ret_void< F > * = nullptr>
optional< T > SOL_TL_OPTIONAL_11_CONSTEXPR	or_else (F &&f) &&
template<class F , detail::enable_if_ret_void< F > * = nullptr>
optional< T >	or_else (F &&f) const &
template<class F , detail::disable_if_ret_void< F > * = nullptr>
optional< T > SOL_TL_OPTIONAL_11_CONSTEXPR	or_else (F &&f) const &
template<class F , detail::enable_if_ret_void< F > * = nullptr>
optional< T >	or_else (F &&f) const &&
template<class F , detail::disable_if_ret_void< F > * = nullptr>
optional< T >	or_else (F &&f) const &&
void	reset () noexcept
	Destroys the stored value if one exists, making the optional empty. More...
void	swap (optional &rhs) noexcept
optional	take () &
optional	take () const &
	take More...
optional	take () &&
	take More...
optional	take () const &&
	take More...
SOL_TL_OPTIONAL_11_CONSTEXPR T &	value ()
SOL_TL_OPTIONAL_11_CONSTEXPR const T &	value () const
template<class U >
constexpr T &	value_or (U &&u) const
	~optional ()=default
	No-op. More...

Public Attributes
template<class F >
decltype(detail::optional_map_impl(std::declval< optional & >(), std::declval< F && >())) SOL_TL_OPTIONAL_11_CONSTEXPR	map (F &&f) &
	Carries out some operation on the stored object if there is one. More...
template<class F >
decltype(detail::optional_map_impl(std::declval< optional && >(), std::declval< F && >())) SOL_TL_OPTIONAL_11_CONSTEXPR	map (F &&f) &&
template<class F >
decltype(detail::optional_map_impl(std::declval< const optional & >(), std::declval< F && >())) constexpr	map (F &&f) const &
template<class F >
decltype(detail::optional_map_impl(std::declval< const optional && >(), std::declval< F && >())) constexpr	map (F &&f) const &&

Private Attributes
T *	m_value

Detailed Description

template<class T>
class sol::optional< T & >

Specialization for when T is a reference. optional<T&> acts similarly to a T*, but provides more operations and shows intent more clearly.

Examples:

int i = 42;
sol::optional<int&> o = i;
*o == 42; //true
i = 12;
*o = 12; //true
&*o == &i; //true

Assignment has rebind semantics rather than assign-through semantics:

int j = 8;
o = j;

&*o == &j; //true

Definition at line 6265 of file sol.hpp.

Member Typedef Documentation

value_type

template<class T >

using sol::optional< T & >::value_type = T&

Definition at line 6673 of file sol.hpp.

Constructor & Destructor Documentation

optional() [1/6]

template<class T >

constexpr sol::optional< T & >::optional ( )

inlinenoexcept

Constructs an optional that does not contain a value. ctor_empty

Definition at line 6677 of file sol.hpp.

optional() [2/6]

template<class T >

constexpr sol::optional< T & >::optional ( nullopt_t  )

inlinenoexcept

ctor_empty

Definition at line 6681 of file sol.hpp.

optional() [3/6]

template<class T >

SOL_TL_OPTIONAL_11_CONSTEXPR sol::optional< T & >::optional ( const optional< T & > &  rhs )

defaultnoexcept

Copy constructor

If rhs contains a value, the stored value is direct-initialized with it. Otherwise, the constructed optional is empty.

optional() [4/6]

template<class T >

SOL_TL_OPTIONAL_11_CONSTEXPR sol::optional< T & >::optional ( optional< T & > &&  rhs )

default

Move constructor

If rhs contains a value, the stored value is direct-initialized with it. Otherwise, the constructed optional is empty.

optional() [5/6]

template<class T >

template<class U = T, detail::enable_if_t<!detail::is_optional< detail::decay_t< U >>::value > * = nullptr>

constexpr sol::optional< T & >::optional ( U &&  u )

inline

Constructs the stored value with u. template <class u="T"> constexpr optional(U &&u);

Definition at line 6699 of file sol.hpp.

optional() [6/6]

template<class T >

template<class U >

constexpr sol::optional< T & >::optional ( const optional< U > &  rhs )

inlineexplicit

Definition at line 6705 of file sol.hpp.

~optional()

template<class T >

sol::optional< T & >::~optional ( )

default

No-op.

Member Function Documentation

and_then() [1/4]

template<class T >

template<class F >

SOL_TL_OPTIONAL_11_CONSTEXPR detail::invoke_result_t<F, T&> sol::optional< T & >::and_then ( F &&  f ) &

inline

and_then Carries out some operation which returns an optional on the stored object if there is one. std::invoke(std::forward<F>(f), value()) returns a std::optional<U> for some U.

Returns

Let U be the result of std::invoke(std::forward<F>(f), value()). Returns a std::optional<U>. The return value is empty if *this is empty, otherwise the return value of std::invoke(std::forward<F>(f), value()) is returned. and_then template <class f>="">
constexpr auto and_then(F &&f) &;

Definition at line 6329 of file sol.hpp.

and_then() [2/4]

template<class T >

template<class F >

SOL_TL_OPTIONAL_11_CONSTEXPR detail::invoke_result_t<F, T&> sol::optional< T & >::and_then ( F &&  f ) &&

inline

and_then template <class f>="">
constexpr auto and_then(F &&f) &&;

Definition at line 6339 of file sol.hpp.

and_then() [3/4]

template<class T >

template<class F >

constexpr detail::invoke_result_t<F, const T&> sol::optional< T & >::and_then ( F &&  f ) const &

inline

and_then template <class f>="">
constexpr auto and_then(F &&f) const &;

Definition at line 6349 of file sol.hpp.

and_then() [4/4]

template<class T >

template<class F >

constexpr detail::invoke_result_t<F, const T&> sol::optional< T & >::and_then ( F &&  f ) const &&

inline

and_then template <class f>="">
constexpr auto and_then(F &&f) const &&;

Definition at line 6360 of file sol.hpp.

conjunction()

template<class T >

template<class U >

constexpr optional<typename std::decay<U>::type> sol::optional< T & >::conjunction ( U &&  u ) const

inline

Returns

u if *this has a value, otherwise an empty optional.

Definition at line 6592 of file sol.hpp.

disjunction() [1/8]

template<class T >

SOL_TL_OPTIONAL_11_CONSTEXPR optional sol::optional< T & >::disjunction ( const optional< T & > &  rhs ) &

inline

Returns

rhs if *this is empty, otherwise the current value. disjunction

Definition at line 6599 of file sol.hpp.

disjunction() [2/8]

template<class T >

constexpr optional sol::optional< T & >::disjunction ( const optional< T & > &  rhs ) const &

inline

disjunction

Definition at line 6604 of file sol.hpp.

disjunction() [3/8]

template<class T >

SOL_TL_OPTIONAL_11_CONSTEXPR optional sol::optional< T & >::disjunction ( const optional< T & > &  rhs ) &&

inline

disjunction

Definition at line 6609 of file sol.hpp.

disjunction() [4/8]

template<class T >

constexpr optional sol::optional< T & >::disjunction ( const optional< T & > &  rhs ) const &&

inline

disjunction

Definition at line 6615 of file sol.hpp.

disjunction() [5/8]

template<class T >

SOL_TL_OPTIONAL_11_CONSTEXPR optional sol::optional< T & >::disjunction ( optional< T & > &&  rhs ) &

inline

disjunction

Definition at line 6621 of file sol.hpp.

disjunction() [6/8]

template<class T >

constexpr optional sol::optional< T & >::disjunction ( optional< T & > &&  rhs ) const &

inline

disjunction

Definition at line 6626 of file sol.hpp.

disjunction() [7/8]

template<class T >

SOL_TL_OPTIONAL_11_CONSTEXPR optional sol::optional< T & >::disjunction ( optional< T & > &&  rhs ) &&

inline

disjunction

Definition at line 6631 of file sol.hpp.

disjunction() [8/8]

template<class T >

constexpr optional sol::optional< T & >::disjunction ( optional< T & > &&  rhs ) const &&

inline

disjunction

Definition at line 6637 of file sol.hpp.

emplace()

template<class T >

template<class... Args>

T& sol::optional< T & >::emplace ( Args &&...  args )

inlinenoexcept

Constructs the value in-place, destroying the current one if there is one.

emplace

Definition at line 6751 of file sol.hpp.

has_value()

template<class T >

constexpr bool sol::optional< T & >::has_value ( ) const

inlinenoexcept

Returns

whether or not the optional has a value has_value

Definition at line 6798 of file sol.hpp.

map_or() [1/4]

template<class T >

template<class F , class U >

U sol::optional< T & >::map_or ( F &&  f, U &&  u  ) &

inline

Maps the stored value with f if there is one, otherwise returns u.

If there is a value stored, then f is called with **this and the value is returned. Otherwise u is returned.

map_or

Definition at line 6526 of file sol.hpp.

map_or() [2/4]

template<class T >

template<class F , class U >

U sol::optional< T & >::map_or ( F &&  f, U &&  u  ) &&

inline

map_or

Definition at line 6532 of file sol.hpp.

map_or() [3/4]

template<class T >

template<class F , class U >

U sol::optional< T & >::map_or ( F &&  f, U &&  u  ) const &

inline

map_or

Definition at line 6538 of file sol.hpp.

map_or() [4/4]

template<class T >

template<class F , class U >

U sol::optional< T & >::map_or ( F &&  f, U &&  u  ) const &&

inline

map_or

Definition at line 6545 of file sol.hpp.

map_or_else() [1/4]

template<class T >

template<class F , class U >

detail::invoke_result_t<U> sol::optional< T & >::map_or_else ( F &&  f, U &&  u  ) &

inline

Maps the stored value with f if there is one, otherwise calls u and returns the result.

If there is a value stored, then f is called with **this and the value is returned. Otherwise std::forward<U>(u)() is returned.

map_or_else template <class F, class U>
auto map_or_else(F &&f, U &&u) &;

Definition at line 6560 of file sol.hpp.

map_or_else() [2/4]

template<class T >

template<class F , class U >

detail::invoke_result_t<U> sol::optional< T & >::map_or_else ( F &&  f, U &&  u  ) &&

inline

map_or_else template <class F, class U>
auto map_or_else(F &&f, U &&u) &&;

Definition at line 6568 of file sol.hpp.

map_or_else() [3/4]

template<class T >

template<class F , class U >

detail::invoke_result_t<U> sol::optional< T & >::map_or_else ( F &&  f, U &&  u  ) const &

inline

map_or_else template <class F, class U>
auto map_or_else(F &&f, U &&u) const &;

Definition at line 6576 of file sol.hpp.

map_or_else() [4/4]

template<class T >

template<class F , class U >

detail::invoke_result_t<U> sol::optional< T & >::map_or_else ( F &&  f, U &&  u  ) const &&

inline

map_or_else template <class F, class U>
auto map_or_else(F &&f, U &&u) const &&;

Definition at line 6585 of file sol.hpp.

operator bool()

template<class T >

constexpr sol::optional< T & >::operator bool ( ) const

inlineexplicitnoexcept

has_value

Definition at line 6803 of file sol.hpp.

operator*() [1/2]

template<class T >

SOL_TL_OPTIONAL_11_CONSTEXPR T& sol::optional< T & >::operator* ( )

inline

Returns

the stored value a value is stored deref constexpr T &operator*();

Definition at line 6786 of file sol.hpp.

operator*() [2/2]

template<class T >

constexpr const T& sol::optional< T & >::operator* ( ) const

inline

deref constexpr const T &operator*() const;

Definition at line 6792 of file sol.hpp.

operator->() [1/2]

template<class T >

constexpr const T* sol::optional< T & >::operator-> ( ) const

inline

Returns

a pointer to the stored value a value is stored pointer constexpr const T *operator->() const;

Definition at line 6772 of file sol.hpp.

operator->() [2/2]

template<class T >

SOL_TL_OPTIONAL_11_CONSTEXPR T* sol::optional< T & >::operator-> ( )

inline

pointer constexpr T *operator->();

Definition at line 6778 of file sol.hpp.

operator=() [1/4]

template<class T >

optional& sol::optional< T & >::operator= ( nullopt_t  )

inlinenoexcept

Assignment to empty.

Destroys the current value if there is one.

Definition at line 6714 of file sol.hpp.

operator=() [2/4]

template<class T >

optional& sol::optional< T & >::operator= ( const optional< T & > &  rhs )

default

Copy assignment.

Rebinds this optional to the referee of rhs if there is one. Otherwise resets the stored value in *this.

operator=() [3/4]

template<class T >

template<class U = T, detail::enable_if_t<!detail::is_optional< detail::decay_t< U >>::value > * = nullptr>

optional& sol::optional< T & >::operator= ( U &&  u )

inline

Rebinds this optional to u.

U must be an lvalue reference. optional &operator=(U &&u);

Definition at line 6730 of file sol.hpp.

operator=() [4/4]

template<class T >

template<class U >

optional& sol::optional< T & >::operator= ( const optional< U > &  rhs )

inline

Converting copy assignment operator.

Rebinds this optional to the referee of rhs if there is one. Otherwise resets the stored value in *this.

Definition at line 6741 of file sol.hpp.

or_else() [1/8]

template<class T >

template<class F , detail::enable_if_ret_void< F > * = nullptr>

optional<T> SOL_TL_OPTIONAL_11_CONSTEXPR sol::optional< T & >::or_else ( F &&  f ) &

inline

Calls f if the optional is empty std::invoke_result_t<F> must be void or convertible to optional<T>. If *this has a value, returns *this. Otherwise, if f returns void, calls std::forward<F>(f) and returns std::nullopt. Otherwise, returns std::forward<F>(f)().

or_else template <class f>=""> optional<T> or_else (F &&f) &;

Definition at line 6452 of file sol.hpp.

or_else() [2/8]

template<class T >

template<class F , detail::disable_if_ret_void< F > * = nullptr>

optional<T> SOL_TL_OPTIONAL_11_CONSTEXPR sol::optional< T & >::or_else ( F &&  f ) &

inline

Definition at line 6462 of file sol.hpp.

or_else() [3/8]

template<class T >

template<class F , detail::enable_if_ret_void< F > * = nullptr>

optional<T> sol::optional< T & >::or_else ( F &&  f ) &&

inline

or_else template <class f>=""> optional<T> or_else (F &&f) &&;

Definition at line 6469 of file sol.hpp.

or_else() [4/8]

template<class T >

template<class F , detail::disable_if_ret_void< F > * = nullptr>

optional<T> SOL_TL_OPTIONAL_11_CONSTEXPR sol::optional< T & >::or_else ( F &&  f ) &&

inline

Definition at line 6479 of file sol.hpp.

or_else() [5/8]

template<class T >

template<class F , detail::enable_if_ret_void< F > * = nullptr>

optional<T> sol::optional< T & >::or_else ( F &&  f ) const &

inline

or_else template <class f>=""> optional<T> or_else (F &&f) const &;

Definition at line 6486 of file sol.hpp.

or_else() [6/8]

template<class T >

template<class F , detail::disable_if_ret_void< F > * = nullptr>

optional<T> SOL_TL_OPTIONAL_11_CONSTEXPR sol::optional< T & >::or_else ( F &&  f ) const &

inline

Definition at line 6496 of file sol.hpp.

or_else() [7/8]

template<class T >

template<class F , detail::enable_if_ret_void< F > * = nullptr>

optional<T> sol::optional< T & >::or_else ( F &&  f ) const &&

inline

Definition at line 6503 of file sol.hpp.

or_else() [8/8]

template<class T >

template<class F , detail::disable_if_ret_void< F > * = nullptr>

optional<T> sol::optional< T & >::or_else ( F &&  f ) const &&

inline

Definition at line 6513 of file sol.hpp.

reset()

template<class T >

void sol::optional< T & >::reset ( )

inlinenoexcept

Destroys the stored value if one exists, making the optional empty.

Definition at line 6841 of file sol.hpp.

swap()

template<class T >

void sol::optional< T & >::swap ( optional< T & > &  rhs )

inlinenoexcept

Swaps this optional with the other.

If neither optionals have a value, nothing happens. If both have a value, the values are swapped. If one has a value, it is moved to the other and the movee is left valueless.

Definition at line 6764 of file sol.hpp.

take() [1/4]

template<class T >

optional sol::optional< T & >::take ( ) &

inline

Takes the value out of the optional, leaving it empty take

Definition at line 6644 of file sol.hpp.

take() [2/4]

template<class T >

optional sol::optional< T & >::take ( ) const &

inline

take

Definition at line 6651 of file sol.hpp.

take() [3/4]

template<class T >

optional sol::optional< T & >::take ( ) &&

inline

take

Definition at line 6658 of file sol.hpp.

take() [4/4]

template<class T >

optional sol::optional< T & >::take ( ) const &&

inline

take

Definition at line 6666 of file sol.hpp.

value() [1/2]

template<class T >

SOL_TL_OPTIONAL_11_CONSTEXPR T& sol::optional< T & >::value ( )

inline

Returns

the contained value if there is one, otherwise throws [bad_optional_access] value synopsis constexpr T &value();

Definition at line 6811 of file sol.hpp.

value() [2/2]

template<class T >

SOL_TL_OPTIONAL_11_CONSTEXPR const T& sol::optional< T & >::value ( ) const

inline

value constexpr const T &value() const;

Definition at line 6822 of file sol.hpp.

value_or()

template<class T >

template<class U >

constexpr T& sol::optional< T & >::value_or ( U &&  u ) const

inline

Returns

the stored value if there is one, otherwise returns u value_or

Definition at line 6835 of file sol.hpp.

Member Data Documentation

m_value

template<class T >

T* sol::optional< T & >::m_value

private

Definition at line 6846 of file sol.hpp.

map [1/4]

template<class T >

template<class F >

decltype(detail::optional_map_impl(std::declval<optional&>(), std::declval<F&&>())) SOL_TL_OPTIONAL_11_CONSTEXPR sol::optional< T & >::map(F &&f) &

inline

Carries out some operation on the stored object if there is one.

Returns

Let U be the result of std::invoke(std::forward<F>(f), value()). Returns a std::optional<U>. The return value is empty if *this is empty, otherwise an optional<U> is constructed from the return value of std::invoke(std::forward<F>(f), value()) and is returned.

map template <class f>=""> auto map(F &&f) &;

Definition at line 6415 of file sol.hpp.

map [2/4]

template<class T >

template<class F >

decltype(detail::optional_map_impl(std::declval<optional&&>(), std::declval<F&&>())) SOL_TL_OPTIONAL_11_CONSTEXPR sol::optional< T & >::map(F &&f) &&

inline

map template <class f>=""> auto map(F &&f) &&;

Definition at line 6422 of file sol.hpp.

map [3/4]

template<class T >

template<class F >

decltype(detail::optional_map_impl(std::declval<const optional&>(), std::declval<F&&>())) constexpr sol::optional< T & >::map(F &&f) const &

inline

map template <class f>=""> auto map(F &&f) const&;

Definition at line 6429 of file sol.hpp.

map [4/4]

template<class T >

template<class F >

decltype(detail::optional_map_impl(std::declval<const optional&&>(), std::declval<F&&>())) constexpr sol::optional< T & >::map(F &&f) const &&

inline

map template <class f>=""> auto map(F &&f) const&&;

Definition at line 6437 of file sol.hpp.

---

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

• sol.hpp