[Boost-bugs] [Boost C++ Libraries] #7035: pair<iterator, iterator>, tie, and Boost.Range co-operate poorly

Subject: [Boost-bugs] [Boost C++ Libraries] #7035: pair<iterator, iterator>, tie, and Boost.Range co-operate poorly
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-06-27 10:41:17

#7035: pair<iterator, iterator>, tie, and Boost.Range co-operate poorly
-------------------------------------------------+--------------------------
 Reporter:  philipp.moeller@…                    |       Owner:  jewillco
     Type:  Feature Requests                     |      Status:  new     
Milestone:  To Be Determined                     |   Component:  graph   
  Version:  Boost 1.49.0                         |    Severity:  Problem 
 Keywords:                                       |  
-------------------------------------------------+--------------------------
 Boost.Graph returns ''std::pair<iterator, iterator>'' for all
 ranges. This works nicely with the common:

 {{{#!cpp
   iterator begin, end;
   for(tie(begin, end) = vertices(graph); begin != end; ++begin) {}
 }}}

 or Boost.Range algorithms.

 When adapting new graphs it is often more convenient to return an
 ''iterator_range'' and work with it, but this doesn't support the
 ''tie' idiom anymore and breaks a lot of code in Boost.Graph.

 Unifying this would be a nice-to-have feature.

 I see two options for this: Either at support for ''tie'' to Range or
 transition Graph towards Range algorithms. The first seems much easier
 to do, but is also a less clean solution because it somewhat muddies
 Range conceptually.

 On the other hand it is not clear to me how much Range is going to
 change with standardization and what version, if any, will end up in
 the next standard.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7035>
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