References and Object Slicing
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26-09-2019 - |
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?
Solution
Not a problem, because you're passing in a reference. You're not creating a new object, just letting MyFunc access the original object.
OTHER TIPS
Since you are passing the reference - no, unless you later assign to an instance of Bar
.
Slicing is only a problem when you cast an object to its parent class. There is no slicing when you cast pointers or references.
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