Template method pattern: Difference between revisions

Revision as of 16:26, 24 January 2020

Revision as of 02:11, 11 February 2020

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* It lets subclasses implement varying behavior (through [[Method overriding (programming)|overriding]] of the hook methods).<ref name=":3">{{Cite book|title=Pro Objective-C Design Patterns for iOS|last=Chung|first=Carlo|publisher=Apress|year=2011|isbn=978-1-4302-3331-2|___location=Berkely, CA|pages=266|quote=|via=}}</ref>

* It avoids duplication in the code: the general workflow of the algorithm is implemented once in the abstract class's template method, and necessary variations are implemented in the subclasses.<ref name=":3" />

* It controlcontrols the point(s) at which specialization is permitted. If the subclasses were to simply override the template method, they could make radical and arbitrary changes to the workflow. In contrast, by overriding only the hook methods, only certain specific details of the workflow can be changed,<ref name=":3" /> and the overall workflow is left intact.

=== Use with code generators ===