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From: snyder@fnal.gov To: gcc-gnats@gcc.gnu.org Subject: c++/9415: g++ 3.4: can't call base class's virtual function Date: Thu, 23 Jan 2003 07:06:00 -0000 [thread overview] Message-ID: <200301230700.BAA06820@d0sgibnl1.fnal.gov> (raw) >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:
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