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and subject line Bug#195806: g++: inheritance of overloaded function
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From: Heiko Scheit <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: g++: inheritance of overloaded function
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Date: Mon, 02 Jun 2003 15:33:17 +0200
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Package: g++
Version: 2:2.95.4-14
Severity: normal
If you try to compile the program given below you will get the
following:
$ g++ test.cc
test.cc: In function `int main()':
test.cc:24: no matching function for call to `B::p1 (int)'
test.cc:16: candidates are: void B::p1()
So, the function B::p1(int) is not found even though it should be
inherited from class A. The problem seems to be that p1 is overloaded
and p1() is redefined and p1(int) is not. For p2 no (overloaded)
function is redefined and it works w/o problem (just comment the line
'b->p1(1);' in main): both functions are inherited from class A.
Everything also works w/o problem if b is declared as A*, instead of
B*, i.e. a pointer to the base class.
I am not sure this is a bug, but I thought that the inheritance should
work also in this case (i.e. with overloaded functions).
When using g++-3.0 I get the same result.
Many Greetings, Heiko
test.cc looks like this:
-------------------------
$ cat test.cc
#include <iostream>
using namespace std;
class A {
public:
virtual void p1() {cout<<"ap1 "<<endl;}
virtual void p1(int i) {cout<<"ap1 "<<i<<endl;}
virtual void p2() {cout<<"ap2 "<<endl;}
virtual void p2(int i) {cout<<"ap2 "<<i<<endl;}
};
class B : public A {
public:
void p1() {cout<<"bp1"<<endl;}
};
int main () {
B* b = new B; // does not work
//A* b = new B; // works
b->p1();
b->p2();
b->p1(1); // comment this line and it also works
b->p2(1);
}
-- System Information
Debian Release: 3.0
Architecture: i386
Kernel: Linux xpc19 2.4.19 #7 Mon Aug 19 16:01:05 CEST 2002 i686
Locale: LANG=C, LC_CTYPE=C
Versions of packages g++ depends on:
ii cpp 2:2.95.4-14 The GNU C preprocessor.
ii g++-2.95 1:2.95.4-11woody1 The GNU C++ compiler.
ii gcc-2.95 1:2.95.4-11woody1 The GNU C compiler.
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From: Matthias Klose <[EMAIL PROTECTED]>
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Date: Tue, 3 Jun 2003 14:32:45 +0200
To: [EMAIL PROTECTED]
Cc: Heiko Scheit <[EMAIL PROTECTED]>
Subject: Re: Bug#195806: g++: inheritance of overloaded function
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Closing the report.
Martin v. =?iso-8859-15?q?L=F6wis?= writes:
> Heiko Scheit <[EMAIL PROTECTED]> writes:
>
> > I am not sure this is a bug, but I thought that the inheritance should
> > work also in this case (i.e. with overloaded functions).
>
> This is not a bug. In standard C++, methods in a derived class hide
> methods in the base class. Any C++ book will tell you so.
