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

Subject: [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: 2010-09-08 07:12:26

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

 the statement
             size_type res_size = (std::min)(
                 static_cast<size_type>(specs.truncate_ - !!prefix_space),
                 buf.pcount() );

 on line 166 ff. causes an error message in Debug mode in VS 2010 when run-
 time checks are enabled:

 "Run-Time Check Failure #1 - A cast to a smaller data type has caused a
 loss of data.  If this was intentional, you should mask the source of the
 cast with the appropriate bitmask.  For example:

         char c = (i & 0xFF);

 Changing the code in this way will not affect the quality of the resulting
 optimized code."

 The value of specs.truncate_ (64 bits) is LLONG_MAX that is going to be
 cast down to a size_t (32 bits). This causes that warning.
 Would it be feasible to initalise the truncate_ member to INT_MAX on 32
 bit systems to avoid this issue?

 This message is *very* annoying since it pops up very frequently.

 Best regards
 Rüdiger

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/4636>
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