Proto for Boost mailing list page: Re: [proto] Using Phoenix inside eUML: mixing grammars

Subject: Re: [proto] Using Phoenix inside eUML: mixing grammars
From: Michael Caisse (boost_at_[hidden])
Date: 2011-05-02 02:39:28

On 05/01/2011 10:32 PM, Thomas Heller wrote:
> On Monday, April 25, 2011 06:39:14 PM Christophe Henry wrote:
>    
>> Anyway, I am hoping not to write any cool transform but simply save
>> the type of the phoenix expression so that I can re-create an actor
>> later. If I need to rewrite differently what BuildGuards was doing, I
>> gain little. I would like phoenix to do the grammar parsing and
>> building of actor.
>>      
> It does ... just pass on proto::_right and it should be good:
>
> struct BuildEventPlusGuard
>    : proto::when<
>          proto::subscript<
>              proto::terminal<event_tag>
>            , phoenix::meta_grammar      // match the phoenix actor
>          >
>        , TempRow<
>              none
>            , proto::_left
>            , none
>            , none
>            , proto::_right // Pass the type along. which is a phoenix actor.
>          >(proto::_right)  // Pass the object along. Which is the actor (1)
>      >
> {};
>
> (1): Here you can work around the thing with the possibly uninitialized stuff.
> Just copy the phoenix actor (should be cheap, if not optimized away completely).
>
>    
>> Thanks,
>> Christophe
>>      
> _______________________________________________
>    

Not that you guys need it... but just consider me on the sidelines 
cheering you on. I've been spending a lot of time lately with MSM and 
would *love* too see some Phoenix 3 support in it!

michael

-- 
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