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c++/9415: g++ 3.4: can't call base class's virtual function
- From: snyder at fnal dot gov
- To: gcc-gnats at gcc dot gnu dot org
- Date: Thu, 23 Jan 2003 01:00:16 CST
- Subject: c++/9415: g++ 3.4: can't call base class's virtual function
- Reply-to: snyder at fnal dot gov
>Number: 9415
>Category: c++
>Synopsis: g++ 3.4: can't call base class's virtual function
>Confidential: no
>Severity: critical
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Thu Jan 23 07:06:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: scott snyder
>Release: 3.4 20030121 (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 unknown
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
>Description:
In the program below, the call to d0_Object::activate() does not call
the method requested. Instead, it does a virtual call to activate() ---
meaning that this program, when run, goes into an infinite recursion.
If i change it so that d0_DBObject is not a template class, then the
program behaves as expected.
$ g++ -o x x.cc
$ ./x
act
act
act
act
act
act
act
... and so on ...
>How-To-Repeat:
----------------------
extern "C" int printf (...);
struct d0_Object
{
virtual void activate() {}
};
template <class K>
struct d0_DBObject : public d0_Object
{
void activate() { printf ("act\n"); d0_Object::activate();}
};
int main ()
{
d0_DBObject<int> x;
x.activate();
return 0;
}
----------------------
>Fix:
<how to correct or work around the problem, if known (multiple lines)>
>Release-Note:
>Audit-Trail:
>Unformatted: