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Date: Mon, 12 May 2003 23:16:00 -0000
From: snyder@fnal.gov
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Subject: c++/10761: [3.4] wrong virtual function called
X-SW-Source: 2003-05/txt/msg01388.txt.bz2
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>Number:         10761
>Category:       c++
>Synopsis:       [3.4] wrong virtual function called
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Mon May 12 23:16:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     scott snyder
>Release:        3.4 20030512 (experimental)
>Organization:
<organization of PR author (multiple lines)>
>Environment:
System: Linux karma 2.4.19-emp_2419p5a829i #1 Tue Sep 3 17:42:17 EST 2002 i686 i686 i386 GNU/Linux
Architecture: i686

	<machine, os, target, libraries (multiple lines)>
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../gcc/configure --prefix=/usr/local/gcc --enable-threads=posix --enable-long-long --enable-languages=c,c++,f77 : (reconfigured) 
>Description:

Another case where we call the derived-class version of a virtual function,
in the face of an explicit request to call the version in the
base class.

The example below goes into an infinite recursive loop:

$ g++ -o x x.cc
$ ./x
B::foo
B::foo
B::foo
B::foo
B::foo
...


>How-To-Repeat:

---------------------------------------------
extern "C" int printf(...);

class A
{
public:
  virtual ~A () {}
  virtual void foo () { printf ("A::foo\n"); }
};

template <class T>
class B
  : public A
{
public:
  virtual void foo () {
    printf ("B::foo\n");
    this->A::foo ();
  }
};

int main ()
{
  B<int> b;
  b.foo();
  return 0;
}
---------------------------------------------

>Fix:
	<how to correct or work around the problem, if known (multiple lines)>
>Release-Note:
>Audit-Trail:
>Unformatted: