Re: [boost] [optional] problems with swap()

From: Fernando Cacciola (fernando.cacciola_at_[hidden])
Date: 2008-04-11 15:01:58

Hi Andrey,

> Your behavior can be implemented in a non-intrusive way something like 
> that:
>
>   template< typename T >
>   void force_koenig_swap(optional< T >& left, optional< T >& right)
>   {
>     bool left_empty = !left;
>     if (left_empty) left = in_place();
>     bool right_empty = !right;
>     if (right_empty) right = in_place();
>
>     using std::swap;
>     swap(left.get(), right.get());
>
>     if (left_empty) right = none;
>     if (right_empty) left = none;
>   }
>
But isn't that, syntax aside, *exactly* the same Thorsten proposed?? I can't 
tell the difference...

Best

-- 
Fernando Cacciola
SciSoft
http://fcacciola.50webs.com
http://groups.google.com/group/cppba