------- Comment #2 from paolo dot carlini at oracle dot com 2009-03-09 18:10
-------
The below, not using any header neither C++0x mode (very likely can be further
reduced), doesn't compile with mainline and 4_3-branch, does with EDG-based
compilers in strict mode:
template<bool>
class __static_assert { };
template<>
class __static_assert<false>;
template<typename T, typename U>
struct __are_same { static const bool value = false; };
template<typename T>
struct __are_same<T, T> { static const bool value = true; };
class A {
};
class B : public A {
};
class C {
};
namespace gc {
template <typename T> class member_ptr;
}
template <typename T> class weak_ptr {
public:
weak_ptr() {}
template <typename X> weak_ptr(const weak_ptr<X>& v) {}
weak_ptr(const gc::member_ptr<T>& v);
template <typename X> weak_ptr& operator=(const weak_ptr<X>& v) {
return *this; }
};
namespace gc {
template <typename T> class member_ptr {
__static_assert<__are_same<C, T>::value> sa;
};
}
int main() {
weak_ptr<A> ap1;
weak_ptr<B> bp1;
ap1 = bp1;
}
--
paolo dot carlini at oracle dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2009-03-09 18:10:02
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39413
