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n. (context computing programming English) In object-oriented programming, an uninstantiable class that provides functionality to be inherited by a subclass.


In object-oriented programming languages, a mixin is a class that contains methods for use by other classes without having to be the parent class of those other classes. How those other classes gain access to the mixin's methods depends on the language. Mixins are sometimes described as being "included" rather than "inherited".

Mixins encourage code reuse and can be used to avoid the inheritance ambiguity that multiple inheritance can cause (the " diamond problem"), or to work around lack of support for multiple inheritance in a language. A mixin can also be viewed as an interface with implemented methods. This pattern is an example of enforcing the dependency inversion principle.

Usage examples of "mixin".

  Mis Square Baxter was mixin suthin in a dipper before the kitchin fire, & a small army of female wimin were rushin wildly round the house with bottles of camfire, peaces od flannil, &c.