Re: [boost] cross_iterator

From: BARTLETT, Peter, FM (Peter.BARTLETT_at_[hidden])
Date: 2005-08-08 08:30:08

>Alex wrote:
>[cross_iterator] 
>Please take a look and let me know what you think.  

A great start but, if I understand correctly, there is a significant
difference with how zip_iterator works.

The zip_iterator's dereference method returns a tuple of references to the
underlying values, whereas your cross_iterator just returns the tuple of
iterators themselves. Thus to use cross_iterator with standard algorithms,
the user would have to provide a function object that acts on iterators
rather than values which is unusual and unintuitive.

Thus to me it seems like cross_iterator needs to borrow much of the TMP code
from the detail of zip_iterator (assuming the community is happy with how
that class works). Conceptually the two classes only differ in the ++ and --
operators.

Pete Bartlett

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