Re: [boost] [fusion] Support for classic boost::tuple

From: Joel de Guzman (joel_at_[hidden])
Date: 2006-09-29 01:22:41

Eric Niebler wrote:
> Joel de Guzman wrote:
>> David Abrahams wrote:
>>> * Boost.Fusion interprets a pair<int*,int*> as a sequence of two
>>>   values of type int*.
>>>
>>> * Boost.Range interprets a pair<int*,int*> x as a sequence of
>>>   x.second-x.first values of type int.
>> Oh man, Now I see the problem. Pardon my slowness!!! Well, it
>> seems, this interpretation of Boost.Range for pair<T*,T*> (or in
>> general, std::pair<iterator,iterator> is at the very least
>> suspicious. If we all agree that pair<T,T> is a tuple (a
>> sequence in Fusion's sense), then pair<T*,T*> shouldn't be
>> any different. I'd say that treating std::pair<iterator,iterator>
>> as a runtime sequence is the wrong generalization.
> 
> 
> It cannot be helped. std::equal_range returns a 
> std::pair<iterator,iterator>. 

So what?

> You'll have to argue with Stepanov about it.

Did he intend to regard std::pair<iterator,iterator> as
a runtime sequence? Is it written in the standard that
a std::pair<iterator,iterator> is a model of a Sequence?

Regards,
-- 
Joel de Guzman
http://www.boost-consulting.com
http://spirit.sf.net