Re: Spirit semantic actions and closures

From: Joel de Guzman (yg-boost-users_at_[hidden])
Date: 2003-03-25 18:39:08

Hi,

You might want to post Spirit support related messages to Spirit's
mailing list so that others can be able to help you out besides me
and that other Spirit users might find the discussion useful.
_______________________________________________
Spirit-general mailing list
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I took the liberty to post your message there. I'll post follow-up
questions related to your inquiry there.

Regards,
--
Joel de Guzman
joel at boost-consulting.com
http://www.boost-consulting.com
http://spirit.sf.net
venkatram_krishnaswamy wrote:
> Hi
>
> I have a question about semantic actions which generate the equivalent
> of synthesized attributes.
>
> It seems that the right hand side of the expression below
>
> rule = element [rule.val = val_type(some_params)];
>
> will require the type of val in the closure associated with rule to be
> val_type which has a constructor which looks like
> val_type::val_type(some_params).
>
> Its not clear to me however how I would synthesize an attribute which
> is a pointer to some type. For example, in the closure I would like
> the type of synthesized attribute to be val_type* and for the right
> hand side of assignment above to be
> val_type(some_params)() which returns a val_type*
> where the following was true of the () operator :
>
> const val_type* val_type::operator () {do something and eventually
> return a val_type*;}
>
> I'd be very grateful if someone could clue me in on how I might do
> this.
>
> thanks
>
> venkat