Re: [boost] Improving the assignment operators of various Boosttypes

Subject: Re: [boost] Improving the assignment operators of various Boosttypes
From: Gevorg Voskanyan (v_gevorg_at_[hidden])
Date: 2008-09-11 03:34:10

Giovanni Piero Deretta wrote:

> If you do not want to deal with move emulation (which I've found very
> brittle in complex expressions), a simple way to to gain the advantage
> of T::operator=(T rhs) even when assigning from lvalues is something
> like:
> 
>    templateT destructive_copy(T& x) {
>       using std::swap;
>       T result;
>       swap(result, x);
>       return x;
>    }
> 
> which relies on NRVO to eliminate expensive copies:

Shouldn't the last statement be   return result;   instead? Or maybe I am missing something?

Best Regards,
Gevorg