If ‘apple’ is a subclass of ‘fruit’ , then List<apple> is a subclass of List<fruit> is this correct ?
If ‘apple’ is a subclass of ‘fruit’ , then List<apple> is a subclass of
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If ‘apple’ is a subclass of ‘fruit’ , then List<apple> is a subclass of List<fruit> is this correct ?
No.
List<apple>andList<fruit>are not related. These both classes could have totally different implementations and there is no way to convert one into the other. For example theList<>template could be specialized in some way forapples that has a totally different structure than the generalList<T>template.And even if the implementations were compatible, it would still be a bad idea to treat a
List<apple>as aList<fruit>since then people would start to put all kinds of fruits into that list that was just supposed to contain apples. See also this entry in the C++ FAQ Lite, that talks about apples and bananas…