mcanthony / observer-c

A pure C implementation of the Observer Pattern

observer-c

A pure C implementation of the Observer Pattern

Using

1. Create something to be observed and other thing to be observing the first one;

2. The observable (subject) includes observer.h and subject.h. The observer only includes 'observer.h.

3. The subject needs to implement at least the subject's interface and two methods: registerObserver and unregisterObserver.

4. The observers then implement the observer interface and the notify method, which is called when an event it is watching is triggered.

Check out the example for a better explanation on this.

The Example

In our example we have some animals, each of them defining a method that will be triggered when a cat meow.

As the animals act in a different manner, they'll, then, behave differently

In technical terms, we have the CAT as the Subject (that object that the others wants to listen to) and the other ANIMALS as Observers (they implement a particular method to be triggered when the subject fires it).

Building and Testing

LICENSE

The MIT License (MIT)

Copyright (c) <2014>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.