Subject< Parent > Class Template Reference

An object telling its state changes to all attached Observer s. More...

#include <Observer.h>

Collaboration diagram for Subject< Parent >:

List of all members.

Classes
struct	Impl
Public Member Functions
virtual void	attach (std::shared_ptr< Observer< Parent > > observer)
virtual void	detach (std::shared_ptr< Observer< Parent > > observer)
Protected Member Functions
virtual void	notify ()
Private Attributes
std::shared_ptr< Impl >	pImpl_

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Detailed Description

template<class Parent>
class Subject< Parent >

An object telling its state changes to all attached Observer s.

An Observer can register itself for updates on the Subject's state change by calling attach() and deregister with detach().

Whenever the implementing Subject wants to update the registered Observer s of its changed state, it must call the notify() method.

This class is meant to be used as a base class for making a Subject out of a arbitrary class, without intrusion to the original class. The final implementation must insert calls to notify() wherever appropriate.

Example:

  class Minx {
    void jinx();
  };

  class MinxSubject: public Subject<Minx> {
    void jinx() {
      Minx::jinx();
      notify();
    }
  }

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

• HyperspaceExplorer/src/Utilities/Observer.h
• HyperspaceExplorer/src/Utilities/Observer.impl.h