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List:       kde-devel
Subject:    slightly off topic: general C++ question
From:       Heiko Nardmann <h.nardmann () secunet ! de>
Date:       1999-07-30 15:26:06
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Hi!

I have a problem with exceptions in that I probably did not really
understand the concept,
I suppose.
I have written the following small test program:

-------------------------------------------------------------------
#include <iostream>
#include <stdexcept>

int main( int argc, char **argv )
{
  try
  {
    throw invalid_argument(string("error"));
  }
  catch (...)
  {
  }

  return 0;
}
-------------------------------------------------------------------

Is there something wrong about it except that it does not do anything
useful?

Now I compile it with
g++ -g -Wall -o test1 test1.cpp

This gives me no warnings so I suppose this is ok?!

Now executing it with
./test1

results in:
Segmentation fault (core dumped)

Now I have a look with gdb:
gdb ./test1 core

which results in:
GNU gdb 4.18
Copyright 1998 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you
are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for
details.
This GDB was configured as "i686-pc-linux-gnu"...
Core was generated by `./test1'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/lib/libstdc++.so.2.9...done.
Reading symbols from /lib/libm.so.6...done.
Reading symbols from /lib/libc.so.6...done.
Reading symbols from /lib/ld-linux.so.2...done.
#0  0x4004816b in __is_pointer (p=0x804af53) from
/usr/lib/libstdc++.so.2.9
(gdb) where
#0  0x4004816b in __is_pointer (p=0x804af53) from
/usr/lib/libstdc++.so.2.9
#1  0x40046aa0 in __cp_pop_exception (p=0x804cd78) from
/usr/lib/libstdc++.so.2.9
#2  0x8049e69 in main (argc=1, argv=0xbffff444) at test1.cpp:11





Is there anyone out there having an idea what I am doing wrong here?
I have a SuSE 6.1 system with the standard egcs-1.1.2 and libstdc++ 2.9
installed.

-- 
Ciao ... Heiko Nardmann (Dipl.-Ing.), h.nardmann@secunet.de, Software
Development
secunet (www.secunet.de), Security Networks GmbH - Sicherheit in
Netzwerken
Weidenauer Str. 223-225, D-57076 Siegen
Tel. : +49 271 48950-13, Fax  : +49 271 48950-50

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