Module observer 

Contains types which implement the “Observer” pattern, in which a single object is used to delegate notifications to a group of dynamic listening object.

![observer diagram][observer-diagram]

Modules

hash_subject

Contains types which allow Observers (which implement the appropriate Hash and Eq traits) to be removed dynamically.

prelude

Exposes the Observer and Subject types at the library level.

vec_subject

Contains types which implement the Observer pattern via an internal Vec.

Structs

HashSubject

Implements Subject backed by a HashSet<T>. T must implement PartialEq and Hash.

VecSubject

Implements Subject backed by a Vec<T>. If T implements Eq, then DetachableSubject is also provided. AttachableSubject is always provided.

Traits

AttachableSubject

Allows Observers to be added to the implementing Subject.

DetachableSubject

Allows Observers to be removed from the implementing Subject.

Observer

An object notified by a Subject.

Subject

An object which notifies some group of Observers. When it is notified, all the listeners are notified.