[Boost-bugs] [Boost C++ Libraries] #12767: Make value-initialized iterators of intrusive containers comparable

Subject: [Boost-bugs] [Boost C++ Libraries] #12767: Make value-initialized iterators of intrusive containers comparable
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2017-01-18 00:30:04

#12767: Make value-initialized iterators of intrusive containers comparable
------------------------------+------------------------
 Reporter:  fdegros@…         |      Owner:  igaztanaga
     Type:  Feature Requests  |     Status:  new
Milestone:  To Be Determined  |  Component:  intrusive
  Version:  Boost 1.63.0      |   Severity:  Problem
 Keywords:                    |
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 Can value-initialized iterators of intrusive containers be compared?

 For example, is the following code valid and well-defined?
 {{{
 using MyList = boost::intrusive::list<MyNode>;
 using It = MyList::iterator;

 It a = It();
 It b = It();

 assert(a == b);
 }}}

 This property is useful when it comes to returning empty ranges without
 having to create a dummy empty container.

 If intrusive containers already support this property, then it would be
 good to explicitly mention it in the documentation. If not, I would like
 to add it as a feature request.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/12767>
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