On 08.03.2009, at 11:02, John Maddock wrote:
If not is there a way to make such a thing? Can't think of a method off the top of my head, but Boosters are a clever lot so you never know....!
One can check if the size changes when creating another class: template< typename D, typename B > struct is_virtual_base_of { struct X : D, virtual B {}; enum { value = sizeof(X)==sizeof(D) }; }; template< typename T > struct is_virtual_base_of< T, T > { enum { value = false }; }; it triggers some warnings with GCC in my experiments when a base class is *not* virtual, but it seems to detect virtual bases just fine. Disclaimer: It's a start, nothing more. I have no idea how other compilers (even other compiler versions of GCC other than 4.3.2) will react on it, etc. Regards, Daniel