问题
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?
回答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.
回答2:
Since you are passing the reference - no, unless you later assign to an instance of Bar.
回答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.
来源：https://stackoverflow.com/questions/2822146/references-and-object-slicing