Re: [Boost-bugs] [Boost C++ Libraries] #5644: tellg returns different results for gnu libstd++ and others standard libraries for codecvt_null

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #5644: tellg returns different results for gnu libstd++ and others standard libraries for codecvt_null
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-07-31 17:56:24

#5644: tellg returns different results for gnu libstd++ and others standard
libraries for codecvt_null
-----------------------------------+----------------------------------------
  Reporter:  Michael.Kv@…          |       Owner:  ramey        
      Type:  Bugs                  |      Status:  closed       
 Milestone:  To Be Determined      |   Component:  serialization
   Version:  Boost 1.46.1          |    Severity:  Problem      
Resolution:  wontfix               |    Keywords:               
-----------------------------------+----------------------------------------
Changes (by ramey):

  * status:  new => closed
  * resolution:  => wontfix

Comment:

 I've looked at the above and also at
 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49269 .

 I have to confess I'm not all that knowledgeable about code_cvt - I didnt'
 write the original code - I just included it.  Still I'm happy to look at
 your issue.  Having done so, I've got a couple of observations.

 a) the response to http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49269 by
 someone
 a lot more knowledgeable than I suggests that this shouldn't be messed
 with.

 b) In your example above, we're opening the stream with std::ios::binary .
 This seems to me to conflict with the usage of code_cvt facets. I know
 that they are implemented at the stream buffer levels so this "should" be
 OK - but still seems to me fundamentally wrong. Specifically, if reading
 one byte from the file results in two bytes after conversion, we expect
 tellg to respond with 1 while we just got two bytes.

 All of the above suggests there is nothing for me to do here.

 Robert Ramey

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5644#comment:1>
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