"Joel de Guzman" <[EMAIL PROTECTED]> wrote in message news:021701c28aba$441963e0$8c564eca@;kim... > > class c2 : public column_name<calculated_column<c2, int, Fn> {}; > > I think public isn't needed.
True. > > tuple[c1()] = 5; > > int n = tuple[c2()]; > > > > Note that passed objects are light-weight, so we don't pay much penalty for > > their construction even if the optimization isn't done. > > Oh, I'm sure it will be optimized! I do believe you :-) However, I think it may be slightly cleaner not to rely on this. First, there is a debug version, and then, the optimization may be switched off (for whatever reason). And besides, we were only able to remove the need in the COLUMN macro because we separated the class used for the column identification from the class used to provide the placeholder for the value. Arkadiy _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
