Abstraction inversion

In computer programming, abstraction inversion is an anti-pattern arising when users of a construct need functions implemented within it but not exposed by its interface. The result is that the users re-implement the required functions in terms of the interface, which in its turn uses the internal implementation of the same functions. This may result in implementing lower-level features in terms of higher-level ones, thus the term 'abstraction inversion'.

Possible ill-effects are:

Ways to avoid this anti-pattern include:

Alleged examples from professional programming circles include:

Examples that are common outside professional programming circles include:

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