[Boost-bugs] [Boost C++ Libraries] #2640: counting_iterator::reference lifetime tied to iterator

Subject: [Boost-bugs] [Boost C++ Libraries] #2640: counting_iterator::reference lifetime tied to iterator
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-01-05 20:54:53

#2640: counting_iterator::reference lifetime tied to iterator
------------------------------------------------+---------------------------
 Reporter:  schoedl                             |       Owner:  dave    
     Type:  Bugs                                |      Status:  new     
Milestone:  Boost 1.38.0                        |   Component:  iterator
  Version:  Boost 1.37.0                        |    Severity:  Problem 
 Keywords:  counting_iterator reverse_iterator  |  
------------------------------------------------+---------------------------
 Currently, counting_iterator<T>::reference is Incrementable const&. This
 makes reverse_iterator< counting_iterator<T> >::dereference return a
 reference to a temporary variable:

 typename super_t::reference dereference() const { return
 *boost::prior(this->base()); }

 The problem is that iterator::reference is expected to stay valid even if
 the iterator it was obtained from is dead.

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Ticket URL: <https://svn.boost.org/trac/boost/ticket/2640>
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