Re: [Boost-users] [Wave] advanced preprocessing hooks

From: Hartmut Kaiser (hartmut.kaiser_at_[hidden])
Date: 2006-06-17 11:51:36

Andreas,

> 	OTOH I like your idea to add a on_warning() pp hook 
> function (same should be
> 	added for #error as well). What do you think, what if 
> we use the return
> 	value of the on_warning() pp hook to decide, whether to 
> throw the exception? 
> 	This way we could keep the default behaviour (throwing) 
> but you could
> 	enforce the non-throwing behaviour simply by returning false.
> 
> 
> I think using the return value form on_warning() or on_hook() 
> to decide if an exception should be thrown is an excellent 
> idea. That would fit very well with my needs.

I've added two new pp hook functions: found_error_directive() and
found_warning_directive(), both taking the context and the directive
argument token sequence as their arguments. The return vaue is used to
suppress the corresponding exception (true suppresses, false keeps the old
behaviour). I have not updated the docs yet (but will do soon).

The changes are in the CVS::HEAD branch only (I'm not allowed to add new
features to the release branch).

HTH
Regards Hartmut