This is an abstract class for which a descendent is declared for every function that may be called. More...

#include <notifier.h>

Inheritance diagram for PNotifierFunctionTemplate< ParamType >:

Collaboration diagram for PNotifierFunctionTemplate< ParamType >:

Public Member Functions
virtual void	Call (PObject &notifier, ParamType extra) const =0
	Execute the call to the actual notification function on the object instance contained in this object. More...

virtual void *	GetTarget () const

Public Member Functions inherited from PSmartObject
	PSmartObject ()
	Construct a new smart object, subject to a `PSmartPointer` instance referencing it. More...

Public Member Functions inherited from PObject
unsigned	GetTraceContextIdentifier () const
	Get PTRACE context identifier. More...

void	SetTraceContextIdentifier (unsigned id)

void	GetTraceContextIdentifier (PObject &obj)

void	GetTraceContextIdentifier (PObject *obj)

void	SetTraceContextIdentifier (const PObject &obj)

void	SetTraceContextIdentifier (const PObject *obj)

virtual	~PObject ()

virtual PObject *	Clone () const
	Create a copy of the class on the heap. More...

template<class CLS >
CLS *	CloneAs () const
	As for Clone() but converts to specified type. More...

virtual PINDEX	HashFunction () const
	This function yields a hash value required by the `PDictionary` class. More...

virtual Comparison	Compare (const PObject &obj) const
	Compare the two objects and return their relative rank. More...

virtual Comparison	CompareObjectMemoryDirect (const PObject &obj) const
	Determine the byte wise comparison of two objects. More...

bool	operator== (const PObject &obj) const
	Compare the two objects. More...

bool	operator!= (const PObject &obj) const
	Compare the two objects. More...

bool	operator< (const PObject &obj) const
	Compare the two objects. More...

bool	operator> (const PObject &obj) const
	Compare the two objects. More...

bool	operator<= (const PObject &obj) const
	Compare the two objects. More...

bool	operator>= (const PObject &obj) const
	Compare the two objects. More...

virtual const char *	GetClass (unsigned ancestor=0) const
	Get the current dynamic type of the object instance. More...

PBoolean	IsClass (const char *cls) const

virtual PBoolean	InternalIsDescendant (const char *clsName) const
	Determine if the dynamic type of the current instance is a descendent of the specified class. More...

__inline const PObject *	PTraceObjectInstance () const

virtual void	PrintOn (ostream &strm) const
	Output the contents of the object to the stream. More...

virtual void	ReadFrom (istream &strm)
	Input the contents of the object from the stream. More...

Protected Member Functions
	PNotifierFunctionTemplate (void target, void =NULL)
	Create a notification function instance. More...

Protected Attributes
void *	m_target
	Object instance to receive the notification function call. More...

Protected Attributes inherited from PSmartObject
PAtomicInteger	referenceCount
	Count of number of instances of `PSmartPointer` that currently reference the object instance. More...

Protected Attributes inherited from PObject
unsigned	m_traceContextIdentifier

Additional Inherited Members
Public Types inherited from PObject
enum	Comparison { LessThan = -1, EqualTo = 0, GreaterThan = 1 }
	Result of the comparison operation performed by the `Compare()` function. More...

Static Public Member Functions inherited from PObject
static Comparison	InternalCompareObjectMemoryDirect (const PObject obj1, const PObject obj2, PINDEX size)
	Internal function caled from CompareObjectMemoryDirect() More...

static const char *	Class ()
	Get the name of the class as a C string. More...

static __inline const PObject *	PTraceObjectInstance (const char *)

static __inline const PObject *	PTraceObjectInstance (const PObject *obj)

Friends inherited from PObject

Detailed Description

template<typename ParamType>
class PNotifierFunctionTemplate< ParamType >

This is an abstract class for which a descendent is declared for every function that may be called.

The PDECLARE_NOTIFIER macro makes this declaration.

The PNotifier and PNotifierFunction classes build a completely type safe mechanism for calling arbitrary member functions on classes. The "pointer to a member function" capability built into C++ makes the assumption that the function name exists in an ancestor class. If you wish to call a member function name that does not exist in any ancestor class, very type unsafe casting of the member functions must be made. Some compilers will even refuse to do it at all!

To overcome this problem, as this mechanism is highly desirable for callback functions in the GUI part of the PTLib library, these classes and a macro are used to create all the classes and declarations to use polymorphism as the link between the caller, which has no knowledege of the function, and the receiver object and member function.

This is most often used as the notification of actions being take by interactors in the PTLib library.