How to create a vector of class objects in C++?

vector<Site> myStack();

This is actually a function declaration. The function is called myStack and it returns a vector<Site>. What you actually want is:

vector<Site> myStack;

The type of neighbours at the moment will store copies of the objects, not references. If you really want to store references, I recommend using a std::reference_wrapper (rather than using pointers):

vector<reference_wrapper<Site>> neighbors;

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