class PNotifier

This class is the PSmartPointer to the PNotifierFunction class.

Inheritance:


Public Methods

[more] PNotifier ( PNotifierFunction* func = NULL )
Create a new notification function smart pointer.
[more]virtual void operator() ( PObject & notifier, INT extra ) const
Execute the call to the actual notification function on the object instance contained in this object.


Inherited from PSmartPointer:

Public Methods

Construction

Overrides from class PObject

Pointer access functions

Protected Fields

oPSmartObject* object


Inherited from PObject:

Public Methods

Run Time Type functions

I/O functions

Miscellaneous functions

Public Members

Comparison functions


Documentation

This class is the PSmartPointer to the PNotifierFunction class.

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 PWLib 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 PWLib library.

o PNotifier( PNotifierFunction* func = NULL )
Create a new notification function smart pointer.
Parameters:
func - Notifier function to call.

ovirtual void operator()( PObject & notifier, INT extra ) const
Execute the call to the actual notification function on the object instance contained in this object. This will make a polymorphic call to the function declared by the PDECLARE_NOTIFIER macro which in turn calls the required function in the destination object.
Parameters:
notifier - Object that is making the notification.
extra - Extra information that may be passed to function.


This class has no child classes.

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