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Composition means to assemble simpler elements into more complex structures. In OOP, composition usually refers to object composition, i.e. assembling several simpler objects into a a more complex aggregate. It may also refer to an aggregation of object, where the aggregate owns some components.
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Composition over inheritance when adding functionality to a foreign object
However, if we were to use composition, this won't work at all. We would need some kind of external map in order to achieve this (in C++ maybe some pointer hackery). … The question is: are there any existing strategies to achieve this behavior via composition that do not involve things like external maps or pointer hackery? …