
use boost::mpl::if_c



git-svn-id: 6c7e10cdde2c115f53707ba8ec4efe535f92d362@1271 4683daeb-ad0f-0410-a623-93161e962ae5

jondo2010/OpenSG,jondo2010/OpenSG,jondo2010/OpenSG,jondo2010/OpenSG,jondo2010/OpenSG