double-ptr usage #3 – vector of pointers

We know the iterator in a vector is physically a raw ptr. If the elements in a vector are pointers, then the iterator is a double ptr. P238 [[STL tutorial]] has a simple yet complete example showing how to dereference the double-ptr twice.

By the way Same example also shows how to use a vector of Shape pointers to hold sub-class instances (of base class shape), like circles, squares…., then call the virtual methods defined in the class hierarchy.

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