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 | // template<class NotAnIterator> |
12 | // struct iterator_traits |
13 | // { |
14 | // }; |
15 | |
16 | #include <iterator> |
17 | |
18 | #include "test_macros.h" |
19 | |
20 | struct not_an_iterator |
21 | { |
22 | }; |
23 | |
24 | template <class T> |
25 | struct has_value_type |
26 | { |
27 | private: |
28 | struct two {char lx; char lxx;}; |
29 | template <class U> static two test(...); |
30 | template <class U> static char test(typename U::value_type* = 0); |
31 | public: |
32 | static const bool value = sizeof(test<T>(0)) == 1; |
33 | }; |
34 | |
35 | int main(int, char**) |
36 | { |
37 | typedef std::iterator_traits<not_an_iterator> It; |
38 | static_assert(!(has_value_type<It>::value), "" ); |
39 | |
40 | return 0; |
41 | } |
42 | |