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
20struct not_an_iterator
21{
22};
23
24template <class T>
25struct has_value_type
26{
27private:
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);
31public:
32 static const bool value = sizeof(test<T>(0)) == 1;
33};
34
35int 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

source code of libcxx/test/std/iterators/iterator.primitives/iterator.traits/empty.pass.cpp