Editing Abstraction inversion (section)

{{Short description|Computer programming anti-pattern}}
{{multiple issues|
{{example farm|date=October 2013}}
{{Original research|date=May 2009}}
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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 (computing)|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:
* The user of such a re-implemented function may seriously underestimate its running-costs.
* The user of the construct is forced to obscure their implementation with complex mechanical details.
* Many users attempt to solve the same problem, increasing the risk of error.