From: David Abrahams (david.abrahams_at_[hidden])
Date: 2002-01-11 09:10:14
----- Original Message -----
From: "John Maddock" <John_Maddock_at_[hidden]>
> Funny you should mention that, I came up with a reasonably protable
> implementation for that the other day - I just haven't had a chance to try
> it out. Heres my rather quickly knocked up code:
>
> #include <boost/type_traits.hpp>
> #include <boost/type_traits/type_traits_test.hpp>
>
> template <class T>
> struct is_polymorphic
> {
> struct d1 : public T
> {
> d1();
> char padding[256];
> };
> struct d2 : public T
> {
> d2();
> virtual ~d2();
> virtual void foo();
> char padding[256];
> };
> BOOST_STATIC_CONSTANT(bool, value = (sizeof(d2) == sizeof(d1)));
> };
By the way, what's the padding for?
-Dave