From: "Richard Peters" <R.A.Peters@[...].nl> 

>  Then you can replace the postfix increment operator with
> 
>      number operator++(int)
>      { return postfix_increment(*this); }

Why not just:

    number operator++(int)
    {
        return postfix_incrementer<number> (*this);
    }

?

>  The only thing is that I do not clearly see if there's still the copying
>  advantage...

I'm pretty sure there's not: the object will be copied again when it is
sliced for the return value. This one will work:

    postfix_incrementer<number>  operator++(int)
    {
        return postfix_incrementer<number> (*this);
    }

But of course, the type identity of the result of the function has
changed... :(

-Dave

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