On Wed, May 4, 2011 at 1:25 PM, Thomas Heller <thom.hel...@googlemail.com> wrote: > 2) Have some kind of completely variadic proto expression. Not by > having variadic > templates but by creating the list of children by some kind of cons list. > This might requires a quite substantial change in proto, haven't fully > investigated > that option.
I needed something like this to implement a "group(expr1, ... , exprN) function that would group several expressions into one. I also hit the max arity limit with that solution, so I changed the syntax to "group << (expr1, ..., expr2)". Using the overloaded comma operator from proto, this becomes a binary tree that can be as large as you want, and can easily be converted to a list using flatten. Probably useless for phoenix, but I thought I'd mention it anyhow :) I would also be interested to go back to the group(...) syntax without needing to modify the limits, so any progress on this would be great. Cheers, -- Bart _______________________________________________ proto mailing list proto@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/proto
