Re: [boost] [mpl]iter_fold_if Forward Backward rationale?

Subject: Re: [boost] [mpl]iter_fold_if Forward Backward rationale?
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2009-05-18 18:19:38

AMDG

David Abrahams wrote:
> on Sun Apr 05 2009, Larry Evans <cppljevans-AT-suddenlink.net> wrote:
>   
>> Just as the ForwardPredicate is "augmented" with protection
>> against dereferencing the end<numbers>::type in this code:
>>
>> https://svn.boost.org/trac/boost/browser/trunk/boost/mpl/iter_fold_if.hpp#L42
>>
>> shouldn't the BackwardPredicate also be augmented with the same
>> protection here:
>>
>> https://svn.boost.org/trac/boost/browser/trunk/boost/mpl/iter_fold_if.hpp#L77
>>     
>
> Well, it doesn't need to be; if it did, tests and uses wouldn't compile
> ;-)
>   

Alas.  AFAICT, there are no tests or uses for the Backward Predicate in MPL.

In Christ,
Steven Watanabe