Module roopes::prelude::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.