Examples
Double dispatch is useful in situations where the choice of computation depends on the runtime types of its arguments. For example, a programmer could use double dispatch in the following situations:
- Adaptive collision algorithms usually require that collisions between different objects be handled in different ways. A typical example is in a game environment where the collision between a spaceship and an asteroid is computed differently than the collision between a spaceship and a spacestation.
- Painting algorithms that require the intersection points of overlapping sprites be rendered in a different manner.
- Personnel management systems may dispatch different types of jobs to different personnel. A
schedulealgorithm that is given a person object typed as an accountant and a job object typed as engineering rejects the scheduling of that person for that job. - Event handling systems that use both the event type and the type of the receptor object in order to call the correct event handling routine.
Read more about this topic: Double Dispatch
Famous quotes containing the word examples:
“There are many examples of women that have excelled in learning, and even in war, but this is no reason we should bring ‘em all up to Latin and Greek or else military discipline, instead of needle-work and housewifry.”
—Bernard Mandeville (1670–1733)
“It is hardly to be believed how spiritual reflections when mixed with a little physics can hold people’s attention and give them a livelier idea of God than do the often ill-applied examples of his wrath.”
—G.C. (Georg Christoph)
“Histories are more full of examples of the fidelity of dogs than of friends.”
—Alexander Pope (1688–1744)