Re: [boost] Re: Re: [Formal review] Collection Traits library

From: John Torjo (john.lists_at_[hidden])
Date: 2004-05-05 13:53:15

>I presume you mean
>
>rng::copy( istream_range<char>( is ), ... );
>  
>
yup

>?
>
>| >at leastv some people wanted that idiom to work.
>
>I don't know how to settle this. I remember at least Alisdair wanted direct iterator support.
>
>So instead of intrinsic support for iterators in collection-traits we would make a range class for each such iterator-type.
>The benefit would be, you would argue, that we needed that range class anyway.  Some would say they don't
>need a range class at all, so its just extra work.
>
>As far as my implementation would be concerned, it would simplify things a great deal. I would have to write
>code to recognize each type of iterator because a std::iterator<...> partial template speciaization will not pick
>up iterators derived from std::iterator<...>.
>
>Anyway, if yours and Matthew's range lib will provide range_adapters that makes it super easy to define
>  
>
In general you need to create a wrapper, which is not very hard. I could 
have a range_adapter which will work exactly for this type of iterators.

>[remark: I see two distinct libs emerging in your work: (1) range-stuff (2) range algorithms]
>  
>
;)

>| >| Since we have value_of, iterator_of, etc., why not reference_of,
>| >| const_reference_of?
>| >
>| >As I write in the faq, reference_of<T>::type can just be value_type_of<T>::type &.
>| >
>| >
>| >
>| As I remember, that's not necessary true for new iterator types...
>
>True. I don't think it is holds for existing iterators.
>But it must be convertible value_type. Hence const reference_type_of<T>::type& can be used to bind a
>temporary. I just don't see how coding with reference_type_of<T>::type in an algorithm will buy you
>anything. I might be wrong.
>
>  
>
I haven't thought that far. I guess if someone will need, will just tell 
you in the future. So, lets wait and see ;)

Best,
John

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John Torjo
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