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[Mike Stump]

On Oct 26, 2005, at 9:28 AM, Joe Buck wrote:
> This is a case of unspecified behavior.

?

> That's what we have standards for: so that compilers work the same way
> for standard-conformant code.

> But in this case, we are talking about the behavior when the  
> compiler is
> given code with *unspecified* behavior.  I believe that people  
> should not
> be writing such code.

?  No.  Please read the C++ standard again:

   1.4.13  unspecified behavior                        
[defns.unspecified]
   behavior,  for  a well-formed program construct and correct data,  
that
   depends on the implementation.  The implementation is not  
required  to
   document which behavior occurs.  [Note: usually, the range of  
possible
   behaviors is delineated by the Standard.  ]


     1 Physical  source file characters are mapped, in an  
implementation-
       defined manner


Now, before you claim that people should not write code that relies  
upon implementation defined behavior, realize that the sentence above  
makes all possible programs reliant upon implementation defined  
behavior.