[Boost-bugs] [Boost C++ Libraries] #7535: filesystem::path::iterator inconsistency with multiple leading separators

Subject: [Boost-bugs] [Boost C++ Libraries] #7535: filesystem::path::iterator inconsistency with multiple leading separators
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-10-19 19:31:16

#7535: filesystem::path::iterator inconsistency with multiple leading separators
----------------------------------------------------+-----------------------
 Reporter:  Stefan Große Pawig <boost@…>            |       Owner:  bemandawes
     Type:  Bugs                                    |      Status:  new       
Milestone:  To Be Determined                        |   Component:  filesystem
  Version:  Boost 1.51.0                            |    Severity:  Problem   
 Keywords:                                          |  
----------------------------------------------------+-----------------------
 Iterating backwards through a filesystem::path does not terminate at
 path::begin() if the path starts with several leading directory
 separators.

 For example:

 {{{
 #include <boost/filesystem.hpp>
 #include <iostream>

 int main()
 {
   boost::filesystem::path p("/////foo");

   boost::filesystem::path::iterator i = p.begin();
   ++i;
   --i;
   std::cout << ((i == p.begin()) ? "same" : "different") << std::endl;
 }
 }}}

 Expected output: `same` \\
 Actual output: `different`

 Looking at the source (filesystem/src/path.cpp), it seems that in
 path::begin() the iterator's m_pos member is set to the position of the
 last leading directory separator.

 During backward iteration, m_pos is set to 0, though, so the iterator
 comparison (which involves comparing the m_pos members) yields false.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7535>
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