Re: [boost] Re: Re: Boost Iterable Range Library update (v1.5)

From: John Torjo (john.lists_at_[hidden])
Date: 2004-11-10 04:38:20

> 
>>If you are going to convince me iterators are easy to use, you have to
> 
> come up
> 
>>with something better than
>>
>>    typedef amended::transform_iterator<
>>        get_empl_name_f,
>>        amended::filter_iterator<
>>            from_ro_f,
>>            std::vector<employee>::const_iterator
>>        >
>>    > romanian_names_t;
>>
> 
> 
>>    std::copy(
>>        romanian_names_t(empls.begin()),
>>        romanian_names_t(empls.end()),
>>        std::ostream_iterator<std::string>(std::cout," ")
>>    );
>>
> 
> 

The problem with iterators, even in Robert's example, is that to further 
compose them, you need to create wrapper functors (get_empl_name_f, 
from_ro_f).

Again, as I've said in the docs, anything that can be done with function 
adaptors can be done with iterators. But the results will be more 
error-prone, harder to write and read.

Best,
John

-- 
John Torjo,    Contributing editor, C/C++ Users Journal
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