Re: [Boost-users] binary mpl::transform fails to compile with fusion::vector

Subject: Re: [Boost-users] binary mpl::transform fails to compile with fusion::vector
From: Mike Tegtmeyer (tegtmeye_at_[hidden])
Date: 2009-06-22 13:19:55

Done. Ticket #3204

Thanks for the help.

Mike

On Mon, 22 Jun 2009, Joel de Guzman wrote:

> Aleksey Gurtovoy wrote:
>
>> No, the error is caused by the following code in MPL's pair_view
>> (which is the underlying implementation mechanism for the binary
>> transform):
>>
>>     typedef typename min<
>>           typename iterator_category<iter1_>::type
>>         , typename iterator_category<iter2_>::type
>>         >::type category_;
>> 
>> That is, as per iterator_category's requirements [1], pair_view
>> assumes that the iterator_category's result would be model of
>> MPL's Integral Constant, which does not seem to be the case with
>> Fusion categories.
>> 
>> [1] 
>> http://www.boost.org/doc/libs/1_39_0/libs/mpl/doc/refmanual/iterator-category.html 
>
> I see. It's a fusion bug then. I'll see what I can do. In the meantime,
> may I request the OP to add a trac ticket entry for this?
>
> Thank you, Aleksey!
>
> Regards,
> -- 
> Joel de Guzman
> http://www.boostpro.com
> http://spirit.sf.net
>
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