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Slicing only happens when an object is upcasted by value (is copied upwards in its inheritance hierarchy), like



class Base {};
class Derived : public Base {};
//
Derived d;
Base b = d; //...

When performing operations on an object it must be clear whether we're concerned with what it holds (value semantics) or where it's at (reference semantics).

It's a profound difference. For...

Usually there's no need to create transient value objects on the heap (unless they're very big and would cause the stack to overflow). This task is performed much better and faster by the stack. In...