invalid initialization of non-const reference of type in gcc but not Visual Studio

Question

I have some code where IInterface is an abstract class.

I was writing this

IInterface &q  = InterfaceImpl();

and compiled it in Vi

Answer 1

InterfaceImpl() returns a temporary object (rvalue) that you cannot keep in a non-const reference.

However when you instantiate IInterface i i becomes an lvalue, So you can keep it in non-const reference.

However binding non-const reference to rvalue is allowed in VS . It has been discussed in this thread