Our WinCE port stores HDC's in an OwnPtr, so we added a deleteOwnedPtr override for HDC. I've enabled this for all Windows builds, because it seems useful for all of them and will optimize out if it's not used. I could easily change the patch to define it for WINCE only if that's preferred. Yong points out that only HDC's created with CreateCompatibleDC can be stored in an OwnPtr - those returned by GetDC would be double-deleted. I don't think this is dangerous because it's the same situation with any resource that's deleted by someone else: you don't own HDC's returned by GetDC, so you shouldn't put them in an OwnPtr.