Re: [boost] [fusion]bug: as_list on cons list is identity

From: Larry Evans (cppljevans_at_[hidden])
Date: 2008-02-06 09:59:58

On 02/06/08 01:21, dan marsden wrote:
> Larry Evans <cppljevans_at_[hidden]> wrote:
> 
> <snip exampling showing make list returns a cons
> cell list, rather than fusion::list>
> 
>> IOW, instead of:
>>
>>  boost::fusion::vector<...>
>>
>> there should be:
>>
>>  boost::fusion::list<...>
>>
>> as the 1st line of the above result type for as_list<source_type>::type.
> 
> Does this lead to a problem in your code? The sequence of cons cells is a list 
> (fusion::list can be seen as just a convenient way of building a long cons cell sequence).
> The cons sequence will behave exactly as a list. Maybe these functions should be
> called as_random_access_sequence, as_bidirectional_sequence etc? Possibly
> that would be less misleading?
> 
Thanks dan, you're right, it doesn't make a difference,
as I just found out.

It appears the original problem was using mpl::filter_view
then mpl::transform on that result, and this lead to a wrong
result.  I'd jumped to the conclusion that the problem was
the fusion cons list, but my recent test results indicate
that the problem is in mpl::filter_view.