Re: [boost] interest in pair projection iterators?

From: Simon Buchan (simon_at_[hidden])
Date: 2005-10-13 03:19:38

David Abrahams wrote:
> Lewis Hyatt <lhyatt_at_[hidden]> writes:
> 
> 
>>The idea is to define a template class,
>>
>>template<typename Iterator> class first_iterator_t {
>>	Iterator pair_iter;
>>public:
>>	first_iterator_t(Iterator const&);
>>	/*...*/
>>};
>>
>>which overloads operator*() and operator->() to access the element named 
>>"first" of the object returned by Iterator::operator*(). (With something 
>>analagous for second_iterator_t.) A function named first_iterator() 
>>provides a convenient creation function a-la std::make_pair().
> 
> 
> Sounds like a job for transform_iterator.
> 
> http://www.boost.org/libs/iterator/doc/transform_iterator.html
> 
transform_iterator<(&_1)->first, Iterator>?

Interesting, it could save me a couple of lines here and there... (every 
little bit helps)