Move constructor seemingly not executed

Question

This is my first experiment with C++0x rvalue references and something strange seems to be going on.

In the code sample below the factory function MakeWindow

Answer 1

Isn’t it obvious? Your code returns a copy of the local temporary Window:

Window MakeWindow()
{
    return Window(CreateWindow());
}

The compiler will in fact optimize this copy away (via return value optimization) – this is why your move constructor is never actually called – but for correctness a copy constructor must still be present.