Re: [Boost-bugs] [Boost C++ Libraries] #4636: Run-Time Check Failure #1 in feed_args.hpp using Visual Studio 2010

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #4636: Run-Time Check Failure #1 in feed_args.hpp using Visual Studio 2010
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2017-10-11 21:32:49

#4636: Run-Time Check Failure #1 in feed_args.hpp using Visual Studio 2010
-------------------------------------+-------------------------------------
  Reporter:  Rüdiger Brünner         |      Owner:  James E. King, III
  <rbruenner@…>                      |
      Type:  Bugs                    |     Status:  new
 Milestone:  To Be Determined        |  Component:  format
   Version:  Boost 1.43.0            |   Severity:  Problem
Resolution:                          |   Keywords:  format Run-Time Check
                                     |  Failure VS2010
-------------------------------------+-------------------------------------

Comment (by James E. King, III):

 format_item::truncate_ uses a std::streamsize which is an unsigned long
 long type, and it is initialized to a max() value for that type if the
 format specification doesn't have explicit truncation defined.  The code
 that can make a string (mk_str) has a maximum size of
 std::string::size_type which is an unsigned long.  This impedance mismatch
 is really the core of the issue here.  The code is relying on a clamping
 mechanism that ensures a cast of the maximum stream size is a useful value
 when truncated to 32-bits.  Therefore it looks like the code in the patch
 is partially correct; there are other instances that need to be addressed
 so I will work on this.

-- 
Ticket URL: <https://svn.boost.org/trac10/boost/ticket/4636#comment:16>
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