Re: [Boost-users] [Proto] Forwarding evaluation via tag

Subject: Re: [Boost-users] [Proto] Forwarding evaluation via tag
From: joel (joel.falcou_at_[hidden])
Date: 2009-09-29 10:11:49

Eric Niebler wrote:
> I don't have a good solution at my fingertips or the time to come up 
> with something really whiz-bang, but you can get part of the way with 
> the proto::lazy transform. For instance, you can handle all binary 
> expressions with:
>
>   bp::when< bp::nary_expr< bp::_, eval_xpr, eval_xpr >
>           , bp::lazy< functor< bp::tag_of< bp::_ > >(
>                 eval_xpr(bp::_left)
>               , eval_xpr(bp::_right)
>             )>
>           >
>
> This uses proto::make to turn functor< bp::tag_of< bp::_ > > into, 
> e.g., function< proto::tag::plus > and then uses proto::call to invoke 
> it.
>
> Hope that moves you in the right direction,
Aaaah bp::lazy ! I was indeed trying to find such thing like that.Maybe 
I can combine this with some fusion::fused or unfused somehow.
I'll give this a try.

-- 
___________________________________________
Joel Falcou - Assistant Professor
PARALL Team - LRI - Universite Paris Sud XI
Tel : [phone]