1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // <iterator>
10 
11 // struct bidirectional_iterator_tag : public forward_iterator_tag {};
12 
13 #include <iterator>
14 #include <type_traits>
15 
16 #include "test_macros.h"
17 
main(int,char **)18 int main(int, char**)
19 {
20     std::bidirectional_iterator_tag tag;
21     ((void)tag); // Prevent unused warning
22     static_assert((std::is_base_of<std::forward_iterator_tag,
23                                    std::bidirectional_iterator_tag>::value), "");
24     static_assert((!std::is_base_of<std::output_iterator_tag,
25                                     std::bidirectional_iterator_tag>::value), "");
26 
27   return 0;
28 }
29