Diamond problem

Multiple inheritance is a feature of some OOP languages in which an object or class can inherit features from more than one parent object or parent class. It is distinct from single inheritance, where an object or class may only inherit from one particular object or class.

Multiple inheritance has been a controversial issue for many years, with opponents pointing to its increased complexity and ambiguity in situations such as the “diamond problem”, where it may be ambiguous as to which parent class a particular feature is inherited from if more than one parent class implements said feature. This can be addressed in various ways, including using virtual inheritance.Alternate methods of object composition not based on inheritance such as mixing and traits have also been proposed to address the ambiguity.