Re: [Boost-bugs] [Boost C++ Libraries] #10156: Error with count_if on QNX

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #10156: Error with count_if on QNX
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-07-01 16:00:45

#10156: Error with count_if on QNX
  Reporter: Niklas Angare <li51ckf02@…> | Owner: ramey
      Type: Patches | Status: new
 Milestone: To Be Determined | Component: serialization
   Version: Boost Development Trunk | Severity: Problem
Resolution: | Keywords:

Comment (by anonymous):

 I don't think your patch would work. The difference of two pointers would
 give an integer - but that integer would only be equal to the number of
 items if the the items were known to be contiguous like in an array or
 vector. The patch might make the test pass - but this would be a fluke.
 (testing only proves the existence of bugs - not their absence).

 I think we have to look more carefully at the error message. I don't have
 QNX, so I can't look at the actual source code which generates these
 messages but I can give you some hints about what to look for. Just look
 in algorithms and see if you can find the signature for count_if and see
 if there is anything interesting. One thing that I did see in the
 implementation of forward_list is that it uses t.begin() rather than
 t.cbegin(). This is because the count_if doesn't alter any of the
 elements of the sequence. Try making this change (and for end() as well
 of course) and see if it helps.

 Another interesting thing to test would be to use the C++11 lambda
 implementation which is currently commented out. That might yield some
 useful and/or surprising information.

 Since you're working with QNX, you might also look into some test failures
 with that platform. In particular look at

 That is the failing test for text_warchive - all tests. Note that these
 fail with both (ARM and intel) versions of QNX being tested. This would
 be helpful to me.

 Robert Ramey

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