class Observable

Defined in: C4Observable.h

An object inherits from the Observable class when it can be observed, and the Observable class provides a mechanism for notifying the observers of the object when events occur.

Definition

template <class observableType, class eventType = void> class Observable

Member Functions

`Observable::HasObservers`	Returns a boolean value indicating whether an observable object has any observers.
`Observable::AddObserver`	Installs an observer on an observable object.
`Observable::RemoveObserver`	Removes an observer from an observable object.
`Observable::PostEvent`	Posts an event to an observable object.

Template Parameters

`observableType`	The type of the class that can be observed. This parameter should be the type of the class that inherits directly from the `Observable` class.
`eventType`	The type of an event object that is sent to observers when an event occurs. If there is no event object, then this parameter should be omitted.

Constructor

Observable();

The constructor has protected access takes no parameters. The Observable class can only exist as a base class for another class.

Description

The Observable class maintains a list of observers that are listening to an observable object for event notifications. An observable object inherits from the Observable class.

Observers are installed by calling the Observable::AddObserver function for the observable object. When an event occurs, the observable object calls the Observable::PostEvent function to sent an event to its current observers.