"BCS" <BCS at pathlink.com> wrote in message news:f0o7hp$29rs$1 at digitalmars.com... > Frits van Bommel wrote: > > where dos that come from?? googel gets nothing > Have a look at Expressions/IsExpressions, number 6. That feature's been around for quite some time now. std.traits.BaseTypeTuple looks a little nicer though.