Re: [Boost-users] [Spirit] Semantic actions (binary parser) - user error or bug?

Subject: Re: [Boost-users] [Spirit] Semantic actions (binary parser) - user error or bug?
From: Hartmut Kaiser (hartmut.kaiser_at_[hidden])
Date: 2011-05-01 10:30:48

> > Seems perfectly normal to me.  You need omit[] around stuff that you
> > don't want to appear as part of the attribute for a rule.  Since your
> > rule's attribute is only a byte, including big_dword as part of the
> > rule without omit would mean that its part of the attribute for the
> > rule too and that doesn't match the layout of the test struct.
> 
> Hi,
> 
> What's wrong with the following code, and how can I fix it? The semantic
> actions seem to be inconsistent (or maybe I'm using them wrong).
> No omit, but no value?

Semantic actions in Karma are supposed to _supply_ the attribute value to generate output from. Therefore your start rule needs to be written as:

    start = big_dword >> big_dword[_1 = ref(temp)];

Regards Hartmut
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