Eric Niebler a écrit :
Hi Joel, I would have an easier time understanding what you were trying to accomplish if you could give an example of an expression you'd like to transform and the desired result of the transform.
Yeah I kinda guessed after posting this. Here is a link to a paper presenting what I am currently porting to proto : http://www.ief.u-psud.fr/~falcou/pub/falcou-PARCO-2007.pdf Quaff is a parallel programming DSL that maps user defined functor class to a process network structure. Basically, take the principles of this paper and just say that instead of having pipe() and par() function, you have operator | and &. The old version of quaff ran on a hand-made expression template system that was - well - a piece of crap. Now, I want to use proto to leverage most of the ET + semantic code. I tried to do so in a straight forward way (aka making a apply_rule transform that mapped a proto expression contents to my semantic rule meta-function) but it failed cause when I was mixing pipe and par (ie | and &), the numbering of PID and insertion of elements went awkward. I also guess i don't have to use mpl::vector then build a boost::tupel out of them thanks to fusion, but considering my first failure, I stepped back. If more info than the paper is needed, I'll have to check with my co-worker to know which code is "safe" to publish here ;) Thanks for the help. -- Joel FALCOU Research Engineer @ Institut d'Electronique Fondamentale Université PARIS SUD XI France