Optional< T >

An optional template as long as the std::optional is not available here. More...

Public Types
typedef T	value_type
	defintion of the value type of this optional

Public Member Functions
	Optional ()
	default CTOR
	Optional (Optional &&)=default
	move CTOR
	Optional (const Optional &)=default
	copy CTOR
Optional &	operator= (Optional &&)=default
	move assignment operator More...
Optional &	operator= (const Optional &)=default
	copy assignment operator More...
	~Optional ()=default
	DTOR.
	Optional (const value_type &value)
	special copy CTOR More...
Optional &	operator= (const value_type &value)
	copy assignment operator More...
	Optional (value_type &&value)
	move CTOR More...
Optional &	operator= (value_type &&value)
	move assignment operator More...
	operator bool () const
	validation status of the optional More...
	operator value_type () const
	conversion to the value type More...
value_type &	operator* ()
	referenced access to the value More...
const value_type	operator* () const
	dereferenced access of the value More...
void	reset ()
	invalidates the value
value_type	get () const
	return the value type as copy More...
bool	operator== (const Optional &other) const
	equality operator. More...
bool	operator!= (const Optional &other) const
	non equality operator. More...

Public Attributes
bool	_valid = false
	is valid or not
value_type	_value = {}
	the value if it is valid

Detailed Description

template<typename T>
struct ddl::dd::utility::Optional< T >

An optional template as long as the std::optional is not available here.

Template Parameters

T	the value type

Definition at line 30 of file access_optional.h.

Constructor & Destructor Documentation

Optional() [1/2]

Optional ( const value_type &  value )

inline

special copy CTOR

Parameters

value

the value to copy

Definition at line 72 of file access_optional.h.

Optional() [2/2]

Optional ( value_type &&  value )

inline

move CTOR

Parameters

value

the value to move

Definition at line 93 of file access_optional.h.

Member Function Documentation

get()

value_type get ( ) const

inline

return the value type as copy

Returns

value_type

Definition at line 164 of file access_optional.h.

References Optional< T >::_value.

operator bool()

operator bool ( ) const

inline

validation status of the optional

Returns

true the value is valid

false the value is not valid

Definition at line 116 of file access_optional.h.

References Optional< T >::_valid.

operator value_type()

operator value_type ( ) const

inline

conversion to the value type

Returns

value_type

Definition at line 126 of file access_optional.h.

References Optional< T >::_value.

operator!=()

bool operator!= ( const Optional< T > &  other ) const

inline

non equality operator.

Parameters

other

the other Optional to compare this Optional to.

Returns

false the Optionals are equal (value and validity)

true the Optionals are not equal.

Definition at line 192 of file access_optional.h.

References Optional< T >::operator==().

operator*() [1/2]

value_type& operator* ( )

inline

referenced access to the value

Returns

value_type&

Definition at line 136 of file access_optional.h.

References Optional< T >::_value.

operator*() [2/2]

const value_type operator* ( ) const

inline

dereferenced access of the value

Returns

const value_type

Definition at line 146 of file access_optional.h.

References Optional< T >::_value.

operator=() [1/4]

Optional& operator= ( const Optional< T > &  )

default

copy assignment operator

Returns

Optional&

operator=() [2/4]

Optional& operator= ( const value_type &  value )

inline

copy assignment operator

Parameters

value

the value to copy

Returns

Optional&

Definition at line 81 of file access_optional.h.

References Optional< T >::_valid, and Optional< T >::_value.

operator=() [3/4]

Optional& operator= ( Optional< T > &&  )

default

move assignment operator

Returns

Optional&

operator=() [4/4]

Optional& operator= ( value_type &&  value )

inline

move assignment operator

Parameters

value

the value to move

Returns

Optional&

Definition at line 103 of file access_optional.h.

References Optional< T >::_valid, and Optional< T >::_value.

operator==()

bool operator== ( const Optional< T > &  other ) const

inline

equality operator.

Parameters

other

the other Optional to compare this Optional to.

Returns

true the Optionals are equal (value and validity)

false the Optionals are not equal.

Definition at line 175 of file access_optional.h.

References Optional< T >::_valid, and Optional< T >::_value.

Referenced by Optional< T >::operator!=().