BUG:cannot convert a pointer

[Dr. Joern v. Holten]

>From my point of view this one is a bug: lines 16 and 17 of
my sample should mean the same. Not using -pedantic 'solves'
the problem.

$gcc -v
Reading specs from /usr/lib/gcc-lib/i686-pc-linux-gnu/2.95/specs
gcc version 2.95 19990728 (release)

$gcc a.cpp -pedantic
a.cpp: In method `void E::f()':
a.cpp:17: cannot convert a pointer of type `E' to a pointer of type `A'
a.cpp:17: because `A' is an ambiguous base class

a.cpp:
---------------------snip-----------------------------
class A
{
  public:
  void f() {}
};

class B : public A {};
class C : public A {};
class D : public C {};

class E : public D, public B
{
  public:
  void f()
  {
    static_cast<D*>(this)->f(); // this works
    D::f();			// and this does not
  }
};

int main() { return 0; }

-- 
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|     |     Dr. Jörn von Holten
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Truth of the day: Managers, not engineers, rule the world.
Trust the computer industry to shorten "Year 2000" to Y2K. It was
this kind of thinking that caused the problem in the first place.