On Tue, Jun 19, 2012 at 9:15 AM, Zbigniew Komarnicki
<cblasius@gmail.com> wrote:
Hello
Why this below program do not compile under g++.
What is the reason, that g++ do not compile ?
//------------------------------------------------------
// file: problem.cpp
#include<iostream>
using namespace std;
class A { public: void out() { cout << "A" << endl; } };
class B: public A { public: void out() { cout << "B" << endl; } };
class C: public A { public: void out() { cout << "C" << endl; } };
class D: public A { public: void out() { cout << "D" << endl; } };
class E: public C, public D { public: void out() { cout << "E" << endl; } };
int main()
{
E e;
e.out();
e.C::out();
e.D::out();
//instead of these 2 lines
e.C::A::out();
e.D::A::out();
//use the following (obvious work a round for the previous 2 line, though it should be unnecessary)
// C c=e;
// c.A::out();
// D d=e;
// d.A::out();
return 0;
}
//------------------------------------------------------
I compile it in this way:
$ g++ -Wall problem.cpp -o problem
problem.cpp: In function ‘int main()’:
problem.cpp:17: error: ‘A’ is an ambiguous base of ‘E’
problem.cpp:18: error: ‘A’ is an ambiguous base of ‘E’
I check it under Squueze:
$ g++ --version
g++ (Debian 4.4.5-8) 4.4.5
Copyright (C) 2010 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
My colleague check it under Windows and it compile and run under MV Studio
2010 without any problems. The result is as expected:
E
C
D
A
A
Is it a bug in g++ compiler under Debian?
Zbigniew
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