References and Object Slicing

Question

I don't have my Effective C++ with me and this is bugging me so much that I have to ask for my own sanity. Given

class Foo : public Bar{}

void MyFunc(Bar &_input);

If I pass in a Foo, am I tangling with the slicing problem or have I avoided it?

Answer 1

Not a problem, because you're passing in a reference. You're not creating a new object, just letting MyFunc access the original object.

Answer 2

Since you are passing the reference - no, unless you later assign to an instance of Bar.

Answer 3

Slicing is only a problem when you cast an object to its parent class. There is no slicing when you cast pointers or references.