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Subject: Re: [Boost-users] Xpressive, symantic actions and combination enumeration
From: Lee Simpson (L33Simpson+boostuser_at_[hidden])
Date: 2009-05-06 21:14:26

I'll clean up the source and post it soon.
As for using '_' inside a 'nil', err, no i'm not. That was just a typo in my
example, I've been using captures.

On Thu, May 7, 2009 at 2:51 AM, Eric Niebler <eric_at_[hidden]> wrote:

> Lee Simpson wrote:
>> Damn. I've just implemented the whole algorithm using your suggested
>> approach, and I've come across a problem.
>> I don't have a simple way to describe my dilemma, so a complex way will
>> ave to do :-/
> The best way is to post source code.
> First of, I'll describe the way I have implemented your suggestion.
>> First off, I utilize an expression of the form ((s1 = expr) >>
>> keep(nil[action(_,...)])) for each significant component of the expression.
> <snip>
> Stop right there. Are you really using nil[action(_,...)] ? In this
> context, xpressive will replace _ with the submatch corresponding to the
> subexpression to which the semantic action is attached. In this case, the
> action is attached to nil, which always matches 0 characters. So your action
> will always be passed an empty submatch. I bet that's not what you want. Did
> you intend nil[action(s1,...)] perhaps?
> --
> Eric Niebler
> BoostPro Computing
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> Boost-users_at_[hidden]

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