On 7/11/2012 4:47 AM, Bart Janssens wrote: > On Tue, Jul 10, 2012 at 11:18 PM, Eric Niebler <e...@boostpro.com> wrote: >> The _unpack transform is pretty general, allowing a lot of variation >> within the pack expansion pattern. There can be any number of Tfx >> transforms, and the wildcard can be arbitrarily nested. So these are all ok: >> >> // just call f0 with all the children >> _unpack<f0(_...)> > > Hi Eric, > > Is it correct that the above example just generates a sequence of > calls to f0, one for every child of the expression?
No, it calls f0 (once) with all the children. It's like: f0(child0, child1, child2...) > If so, we are > currently implementing that functionality like this: > https://github.com/coolfluid/coolfluid3/blob/master/cf3/solver/actions/Proto/ExpressionGroup.hpp > > So for us this would avoid the (in this case quite simple) primitive > transform. Ah, you need a for_each transform. That wouldn't be hard to add. Feel free to file a feature request so I don't loose track of it. -- Eric Niebler BoostPro Computing http://www.boostpro.com _______________________________________________ proto mailing list proto@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/proto
