Re: [Boost-users] Odd limitation in Fusion design ?

Subject: Re: [Boost-users] Odd limitation in Fusion design ?
From: Larry Evans (cppljevans_at_[hidden])
Date: 2010-07-08 08:21:43

On 07/07/10 20:26, Larry Evans wrote:
[snip]

> 
> Sounds like the if_recur template metaprogram found here:
> 
> http://svn.boost.org/svn/boost/sandbox/variadic_templates/boost/mpl/if_recur.hpp 
> 
> 
> does what your asking, except for templates, not values.
> I'd guess it could serve as a guide on how to do it for values.
> 
[snip]
Further explanation is found here:

   http://article.gmane.org/gmane.comp.lib.boost.devel/190063

which also mentions a limitation of the if_recur, i.e. it cannot
short-circuit going up the "recursion stack".  As also mentioned
in that post, a while_ with explicit stack can be used to do
the short-circuiting going up.