circle-ellipse problem
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(object-oriented programming) The problematic situation where a base class contains methods which mutate an object in a manner which may invalidate a (stronger) invariant found in a derived class, violating the Liskov substitution principle. For example, if a circle is modelled as a subtype of an ellipse, and the ellipse has a method that stretches it on one axis, the circle must also implement that method despite it making no sense for a circle.
circle-ellipse problem
When designing object-oriented APIs, you should avoid the circle-ellipse problem because it forces subclasses to implement mutations that can violate stronger invariants.
When designing object-oriented APIs, you should avoid the circle-ellipse problem because it forces subclasses to implement mutations that can violate stronger invariants.
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