Re: [Boost-Users] Re: [boost] Iterator Adaptor Poll

From: Jeremy Siek (jsiek_at_[hidden])
Date: 2002-07-26 10:20:00

Looks great! BTW, I think this example will be really useful to people who
are trying to use old C data-structures inside of new C++ code.

It would be great to have a slist implementation in boost...

On Fri, 26 Jul 2002, David Abrahams wrote:

dave> OK, here's my (untested) singly-linked-list iterator:
dave>
dave> typedef std::string slist_data;
dave> struct slist_node
dave> {
dave>     slist_node* next;
dave>     slist_data data;
dave> };
dave>
dave> struct slist_policies : default_iterator_policies
dave> {
dave>     template <class IteratorAdaptor>
dave>     void increment(IteratorAdaptor& x) {
dave>         x.base() = x.base()->next;
dave>     }
dave>
dave>     template <class IteratorAdaptor>
dave>     typename IteratorAdaptor::reference dereference(IteratorAdaptor& x) {
dave>         return x.base()->data;
dave>     }
dave>
dave>     // initialize, equal covered by default policies
dave> };
dave>
dave> typedef iterator_adaptor<slist_node*, slist_policies, slist_data,
dave> category_is<std::forward_iterator_tag> > slist_iterator;
dave>
dave> typedef iterator_adaptor<slist_node const*, slist_policies, slist_data
dave> const, category_is<std::forward_iterator_tag> > slist_const_iterator;
dave>
dave>
dave> -Dave
dave>
dave>
dave> -----------------------------------------------------------
dave>            David Abrahams * Boost Consulting
dave> dave_at_[hidden] * http://www.boost-consulting.com
dave>
dave>
dave> ----- Original Message -----
dave> From: "Jeremy Siek" <jsiek_at_[hidden]>
dave> To: <Boost-Users_at_[hidden]>
dave> Cc: <boost_at_[hidden]>
dave> Sent: Friday, July 26, 2002 10:58 AM
dave> Subject: Re: [Boost-Users] Re: [boost] Iterator Adaptor Poll
dave>
dave>
dave> > On Fri, 26 Jul 2002, David Abrahams wrote:
dave> > dave>
dave> > dave> Don't you think people will find an iterator which traverses the
dave> > dave> elements of a real sequence to be more-obvious? That's why I'm
dave> > dave> suggesting the singly-linked list iterator.
dave> >
dave> > The singly-linked list example was the second thing that popped into my
dave> > mind... I like that a lot too. Perhaps we should do both :)
dave> >
dave> > Cheers,
dave> > Jeremy
dave> >
dave> >
dave> > ----------------------------------------------------------------------
dave> >  Jeremy Siek                          http://php.indiana.edu/~jsiek/
dave> >  Ph.D. Student, Indiana Univ. B'ton   email: jsiek_at_[hidden]
dave> >  C++ Booster (http://www.boost.org)   office phone: [phone]
dave> > ----------------------------------------------------------------------
dave> >
dave> >
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----------------------------------------------------------------------
 Jeremy Siek                          http://php.indiana.edu/~jsiek/
 Ph.D. Student, Indiana Univ. B'ton   email: jsiek_at_[hidden]
 C++ Booster (http://www.boost.org)   office phone: [phone]
----------------------------------------------------------------------