#include <nullable.h>

Public Member Functions
	Nullable ()

	Nullable (const NullValue &)

	Nullable (const std::nullptr_t &)

	Nullable (const T &t)

	Nullable (const Nullable< T > &t)

Nullable< T > &	operator= (const T &t)

Nullable< T > &	operator= (const Nullable< T > &t)

bool	isNull () const

	operator T () const

T &	value ()

T	value (const T &defaultval=T()) const

T	valueOrDefault () const
	Helper to automatically convert to base type. More...

T &	data ()

T	data (const T &defaultval=T()) const

T	dataOrDefault () const
	Helper to automatically convert to base type. More...

T *	operator-> () const
	converts the nullable to a pointer of the wrapped class - acting like a smart pointer More...

bool	operator== (const T &t) const

bool	operator!= (const T &t) const

bool	operator== (const Nullable< T > &t) const

bool	operator!= (const Nullable< T > &t) const

bool	operator== (const NullValue &) const
	compares the Nullable with the special null value More...

bool	operator!= (const NullValue &) const
	compares the Nullable with the special null value More...

bool	operator== (const std::nullptr_t &) const
	compares the Nullable with the special null value More...

bool	operator!= (const std::nullptr_t &) const
	compares the Nullable with the special null value More...

Detailed Description

template<class T>
class Nullable< T >

wrapper around scalar values that makes them NULL-able, i.e. the virtual value NULL is added to the range of the wrapped value; wrapped classes must have a default constructor and =, == and != operators

Constructor & Destructor Documentation

template<class T>

Nullable< T >::Nullable ( )

inline

creates a NULL value

template<class T>

Nullable< T >::Nullable ( const NullValue & )

inline

creates a NULL value

template<class T>

Nullable< T >::Nullable ( const std::nullptr_t & )

inlineexplicit

creates a NULL value

template<class T>

Nullable< T >::Nullable ( const T & t )

inline

creates a wrapped non-NULL value that is equivalent to the original

template<class T>

Nullable< T >::Nullable ( const Nullable< T > & t )

inline

copies a nullable value

Member Function Documentation

template<class T>

T& Nullable< T >::data ( )

inline

returns a reference to the wrapped value - the result is undefined if it us currently NULL

template<class T>

T Nullable< T >::data ( const T & defaultval = T() ) const

inline

returns the original value, if it is currently NULL it returns the given default value, if no default is given an instance created with the default constructor is returned

template<class T>

T Nullable< T >::dataOrDefault ( ) const

inline

Helper to automatically convert to base type.

template<class T>

bool Nullable< T >::isNull ( ) const

inline

returns whether this instance is NULL

template<class T>

Nullable< T >::operator T ( ) const

inline

converts this nullable to the original wrapped class - uses the default constructor if it is NULL

template<class T>

bool Nullable< T >::operator!= ( const T & t ) const

inline

compares this instance with a value of the original class, NULL is different from ANY instance of the original class

template<class T>

bool Nullable< T >::operator!= ( const Nullable< T > & t ) const

inline

compares two nullable instances, if both are NULL it returns false

template<class T>

bool Nullable< T >::operator!= ( const NullValue & ) const

inline

compares the Nullable with the special null value

template<class T>

bool Nullable< T >::operator!= ( const std::nullptr_t & ) const

inline

compares the Nullable with the special null value

template<class T>

T* Nullable< T >::operator-> ( ) const

inline

converts the nullable to a pointer of the wrapped class - acting like a smart pointer

template<class T>

Nullable<T>& Nullable< T >::operator= ( const T & t )

inline

makes this instance non-NULL and equivalent to the given value

template<class T>

Nullable<T>& Nullable< T >::operator= ( const Nullable< T > & t )

inline

copies the given nullable value

template<class T>

bool Nullable< T >::operator== ( const T & t ) const

inline

compares this instance with a value of the original class, NULL is different from ANY instance of the original class

template<class T>

bool Nullable< T >::operator== ( const Nullable< T > & t ) const

inline

compares two nullable instances, if both are NULL it returns true

template<class T>

bool Nullable< T >::operator== ( const NullValue & ) const

inline

compares the Nullable with the special null value

template<class T>

bool Nullable< T >::operator== ( const std::nullptr_t & ) const

inline

compares the Nullable with the special null value

template<class T>

T& Nullable< T >::value ( )

inline

returns a reference to the wrapped value - the result is undefined if it us currently NULL

template<class T>

T Nullable< T >::value ( const T & defaultval = T() ) const

inline

returns the original value, if it is currently NULL it returns the given default value, if no default is given an instance created with the default constructor is returned

template<class T>

T Nullable< T >::valueOrDefault ( ) const

inline

Helper to automatically convert to base type.

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

include/nullable.h

Public Member Functions

Detailed Description

template<class T> class Nullable< T >

Constructor & Destructor Documentation

Member Function Documentation

template<class T>
class Nullable< T >