C++11: Move/Copy construction ambiguity?

Question

In C++11 we can define copy and move constructors, but are both allowed on the same class? If so, how do you disambiguate their usage? For example:

Foo MoveA         


        

Answer 1

Foo MoveAFoo() {
  Foo f;
  return f;
}

This is definition of function MoveAFoo that returns object of type Foo. In its body local Foo f; is created and destructed when it goes out of its scope.

In this code:

Foo x = MoveAFoo();

object Foo f; is created inside of MoveAFoo function and directly assigned into x, which means that copy constructor is not called.

But in this code:

Foo x;
x = MoveAFoo();

object Foo f; is created inside of MoveAFoo function, then the copy of f is created and stored into x and original f is destructed.