tlp::Observer Class Reference

#include <Observable.h>

List of all members.

Public Member Functions

• Observer (bool manageObservables=true)
• virtual ~Observer ()
• virtual void update (std::set< Observable * >::iterator begin, std::set< Observable * >::iterator end)=0
• virtual void observableDestroyed (Observable *)=0

Protected Member Functions

• void addObservable (Observable *)
• void removeObservable (Observable *)
• tlp::Iterator< Observable * > * getObservables () const

Friends

• class Observable

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Detailed Description

The Observer pattern is a framework for handling state dependency between observer and observed object. It is described in the lecture notes and pp293-304 of Design Patterns by Gamma, Helm, Johnson, and Vlissides.

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Constructor & Destructor Documentation

tlp::Observer::Observer

(

bool

manageObservables = true

)

[inline]

virtual tlp::Observer::~Observer

(

)

[virtual]

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Member Function Documentation

void tlp::Observer::addObservable

(

Observable *

)

[protected]

This method is called when this observer is added to an observable.

tlp::Iterator<Observable *>* tlp::Observer::getObservables

(

)

const [protected]

This method returns the list of observed objects.

Note:

This list is copyied to ensure that an Observer cannot modify its internal Observables list

virtual void tlp::Observer::observableDestroyed

(

Observable *

)

[pure virtual]

Method called when an observable has been deleted. holdObservers and unHoldObservers have no effects on this function.

void tlp::Observer::removeObservable

(

Observable *

)

[protected]

This method is called when this observer is removeed from an observable.

virtual void tlp::Observer::update	(	std::set< Observable * >::iterator	begin,
		std::set< Observable * >::iterator	end
	)			[pure virtual]

Method called when a change occur in the observed objects. Due to the possibility to differs notificatiosn several objects can send a notify event simultaneously. The iterators given in parameter enable to iterate all these objects.

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Friends And Related Function Documentation

friend class Observable [friend]