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class Shape {
public:
virtual double Area() { return 1.0; }
virtual double Perimeter() { return 1.0; }
// Note that destructors generate two entries in the vtable: base object
// destructor and deleting destructor.
virtual ~Shape() = default;
};
class Rectangle : public Shape {
public:
~Rectangle() override = default;
double Area() override { return 2.0; }
double Perimeter() override { return 2.0; }
virtual void RectangleOnly() {}
// This *shouldn't* show up in the vtable.
void RectangleSpecific() { return; }
};
// Make a class that looks like it would be virtual because the first ivar is
// a virtual class and if we inspect memory at the address of this class it
// would appear to be a virtual class. We need to make sure we don't get a
// valid vtable from this object.
class NotVirtual {
Rectangle m_rect;
public:
NotVirtual() = default;
};
int main(int argc, const char **argv) {
Shape shape;
Rectangle rect;
Shape *shape_ptr = ▭
Shape &shape_ref = shape;
shape_ptr = &shape; // Shape is Rectangle
NotVirtual not_virtual; // Shape is Shape
return 0; // At the end
}
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