Instance Methodupdate(_:for:)updateClass:forFont:error:updateClass_forFont_error_Declarationfunc update( _ aClass: GSClass, for font: GSFont ) throwsDeclaration- (BOOL) updateClass:(GSClass *) aClass forFont:(GSFont *) font error:(NSError **) error;DeclarationupdateClass_forFont_error_( aClass: GSClass, font: GSFont ) -> tuple[bool, NSError]