This avoids the warning about __cplusplus being undefined in the recently added wxOVERRIDE logic and make the existing wx_xxx_cast<>s definitions simpler. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76177 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775