Re: [Boost-users] [iterator]counting_iterator question

18 Jul 2006

      From: "David Abrahams" dave@boost-consulting.com
...
"Sean Huang"  writes:
...
My question is why limiting the last three template parameters to default 
in
counting_iterator::distance_to.
Sorry, I don't understand the question.
The only thing that's limited here is that you can only compare
counting iterators that have the same CategoryOrTraversal and
Difference parameters.  That might be a bit shortsighted; maybe we
should have additional template arguments to distance_to.
Sorry, I meant the last TWO template parameters.
The distance_to is declared as:

template < class OtherIncrementable >
difference_type
distance_to(counting_iterator<OtherIncrementable > const& y) const;

My understanding is this is equivent to (correct me if I am wrong):

template < class OtherIncrementable >
difference_type
distance_to(counting_iterator const& y) const;

To do what you want, shouldn't it be:

template < class OtherIncrementable >
difference_type
distance_to(counting_iterator const& y) const;

Maybe the compiler is wrong?

Thanks,

Sean