Subject: Re: [Boost-users] [Proto] Splitting AST
From: Eric Niebler (eric_at_[hidden])
Date: 2009-03-02 14:17:44
Joel Falcou wrote:
> Let's say I want to take an expression involving operators +,-,*,/ and a
> function split.
>
> What I want to do is writing a transform taking such an expression and
> returning a fusion::vector or list (I guess) of expressions containing
> all sub-expressions of the original AST only separated on each insatcne
> of a split call.
>
> E.g :
>
> Xpr = a+b+split( c*d + split(e-f));
> is turned into
>
> Xprs = [ a+b+placeholder<1>, c*d+placeholder<2>, e-f];
>
> I guess I should use the State/Data parameters of the transform but i
> can't get the thing right. Any hints on how to tackle this without
> losing hairs ?
You're right, that's tricky. I'll think about it as time allows.
-- Eric Niebler BoostPro Computing http://www.boostpro.com