🚀 go-pugleaf

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From: djb@babypuss.mitre.org (David J. Braunegg)
To: bug-g++@prep.ai.mit.edu
Cc: djb@babypuss.mitre.org
Date: Fri, 22 Jan 93 17:29:04 -0500

This is a bug report for g++ (gcc) version 2.3.3, running on a Sun
Sparcstation, OS 4.1.


Your declaration of

        ostream& operator<<(void *p);

in iostream.h is in error.  Unless you have truly defined operator<<
on void* pointers so that it modifies the pointer, the declaration
should instead be

        ostream& operator<<(const void *p);



For example, the following program should *not* issue the const
violation warning that it does.



#include <iostream.h>

int main()
{
  const char *foo = "stuff";

  cout << (const void *)foo << endl;

  return 0;
}




djb@bambam>g++ -g -Wall test.cc
test.cc: In function `int  main ()':
test.cc:7: warning: argument passing of non-`const *' pointer from `const *'
test.cc:7: warning: argument passing of non-`const *' pointer from `const *'



I have encountered this warning frequently, because in my code I am
often writing out the address of an object to help identify it.  If
foo is `const <class> *', then I must cast it to `const void *' and
*not* to `void *' when printing its address in order to avoid a const
violation.


Please contact me if you have any further questions.

Dave

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--
Brendan Kehoe                                               brendan@cygnus.com
Cygnus Support, Mountain View, CA                              +1 415 903 1400
                     ``In a cruel and imperfect world,'' says critic Rex Reed,
 ``[Audrey Hepburn] was living proof that God could still create perfection.''