在C ++中扩展继承的数组

Question

I have pointer, assume it should be array of class A. this pointer is defined in Ancesor class, as [2]. it's set in constructor. the inheritor want to add 2 additional cells to this array, ie the array shall be [4].

the constructor isn't offer the option to use overrided virtual methods. so, how can I extends the array in inheritor to be 4 instead of 2, without creating the 2 in the ancesor, delete it in inheritor, and create new 4?

BTW, it's not possible to use container such vector etc. it must be array.

Answer 1

If you are setting the size of the array in the constructor, then the simplest solution is simply to overload the constructor.

If you create a new constructor with a parameter being the size of the array, then you can simply call that ancestor constructor from within the derived class' constructor.

In code:

Ancestor( unsigned int arraySize ){ array = new OBJECT[arraySize]; }

Then use that in the derived.