Speakur

Word Pronunciation & Dictionary

circle-ellipse problem

Word Rarity Rare

Frequency: Zipf frequency 2.67 in modern English

Syllables
cir-cle-el-lipse prob-lem
IPA
32
Scrabble Score
20
Letters
5
Syllables
10
Unique Chars

Meaning

noun

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.

Questions

What does circle-ellipse problem mean?
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.

How to pronounce circle-ellipse problem

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