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]