//===----------------------------------------------------------------------===// // // The LLVM Compiler Infrastructure // // This file is dual licensed under the MIT and the University of Illinois Open // Source Licenses. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // <iterator> // struct bidirectional_iterator_tag : public forward_iterator_tag {}; #include <iterator> #include <type_traits> int main() { std::bidirectional_iterator_tag tag; static_assert((std::is_base_of<std::forward_iterator_tag, std::bidirectional_iterator_tag>::value), ""); static_assert((!std::is_base_of<std::output_iterator_tag, std::bidirectional_iterator_tag>::value), ""); }