Question

If I have a vector of objects in one class which I want to change in another, I would try and pass all the information by reference.

What exactly do I need to pass by reference though? The vector? The objects? Both?

Essentially what I’m asking is: What is the difference between these?

vector&<object> blah; // A reference to a vector of objects?

vector<object&> blah; // A vector of references to objects?

vector&<object&> blah; // A reference to a vector of references to objects???

I’m not actually sure how referencing of array like containers work. Are these legal?

Answer 1

vector&<object> is a syntax error. vector<object&> is invalid, because a vector’s value type must be assignable. vector&<object&> blah is a syntax error.

A reference to a vector is vector<T>&.