C++ Overridden method not getting called

Question

Shape.h

namespace Graphics {
    class Shape {
    public:
        virtual void Render(Point point) {};
    };
}

Rect.h

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Answer 1

Here's your problem:

struct ShapePointPair {
        Shape shape;
        Point location;
};

You are storing a Shape. You should be storing a Shape *, or a shared_ptr or something. But not a Shape; C++ is not Java.

When you assign a Rect to the Shape, only the Shape part is being copied (this is object slicing).