"Robert I. Eachus" a �crit dans le message news: 3EDEA840.6020908@attbi.com... > The reason that the boolean operations are predefined for arrays is that > it would be very difficult for a compiler to figure out the > optimizations to use bit-wise operations on words otherwise. My memory is that boolean array operations are there because the requirements called for a functionality equivalent to Pascal's sets -- --------------------------------------------------------- J-P. Rosen (rosen@adalog.fr) Visit Adalog's web site at http://www.adalog.fr