Re: [Spirit-general] Attribute compatibility and Semantic actions

> Now, I committed code to the boost trunk that allows attribute
> compatibility on semantic actions. This code (Boost trunk) will kick in
> when you
> 
>      #define BOOST_SPIRIT_ACTIONS_ALLOW_ATTR_COMPAT
> 
> This is necessary because the code is **will break existing code**.
> Without the define, the old behavior will work as usual.
> 
> So, what are the advantages:
> 
> 1) The nice attribute compatibility rules can now apply to
>     semantic actions giving us uniform behavior
> 2) Parsers with semantic actions will now be a lot more
>     efficient. While semantic-action-less attribute grammars
>     are cool, a lot of times, we still have to resort to SAs
>     to do some computation. This behavior will again give SAs
>     equal footing in terms of performance.

That's great! Although my guess is that it will not break too much of
existing code. The change rather extends what's possible. Have you tried
compiling the existing tests with this constant defined?

Now I need to implement something similar for Karma, I believe...

Regards Hartmut
---------------
http://boost-spirit.com




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