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 Category, class T, class Distance = ptrdiff_t,
12 // class Pointer = T*, class Reference = T&>
13 // struct iterator
14 // {
15 // typedef T value_type;
16 // typedef Distance difference_type;
17 // typedef Pointer pointer;
18 // typedef Reference reference;
19 // typedef Category iterator_category;
20 // };
21
22 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
23
24 #include <iterator>
25 #include <type_traits>
26
27 #include "test_macros.h"
28
29 struct A {};
30
31 template <class T>
32 void
test2()33 test2()
34 {
35 typedef std::iterator<std::forward_iterator_tag, T> It;
36 static_assert((std::is_same<typename It::value_type, T>::value), "");
37 static_assert((std::is_same<typename It::difference_type, std::ptrdiff_t>::value), "");
38 static_assert((std::is_same<typename It::pointer, T*>::value), "");
39 static_assert((std::is_same<typename It::reference, T&>::value), "");
40 static_assert((std::is_same<typename It::iterator_category, std::forward_iterator_tag>::value), "");
41 }
42
43 template <class T>
44 void
test3()45 test3()
46 {
47 typedef std::iterator<std::bidirectional_iterator_tag, T, short> It;
48 static_assert((std::is_same<typename It::value_type, T>::value), "");
49 static_assert((std::is_same<typename It::difference_type, short>::value), "");
50 static_assert((std::is_same<typename It::pointer, T*>::value), "");
51 static_assert((std::is_same<typename It::reference, T&>::value), "");
52 static_assert((std::is_same<typename It::iterator_category, std::bidirectional_iterator_tag>::value), "");
53 }
54
55 template <class T>
56 void
test4()57 test4()
58 {
59 typedef std::iterator<std::random_access_iterator_tag, T, int, const T*> It;
60 static_assert((std::is_same<typename It::value_type, T>::value), "");
61 static_assert((std::is_same<typename It::difference_type, int>::value), "");
62 static_assert((std::is_same<typename It::pointer, const T*>::value), "");
63 static_assert((std::is_same<typename It::reference, T&>::value), "");
64 static_assert((std::is_same<typename It::iterator_category, std::random_access_iterator_tag>::value), "");
65 }
66
67 template <class T>
68 void
test5()69 test5()
70 {
71 typedef std::iterator<std::input_iterator_tag, T, long, const T*, const T&> It;
72 static_assert((std::is_same<typename It::value_type, T>::value), "");
73 static_assert((std::is_same<typename It::difference_type, long>::value), "");
74 static_assert((std::is_same<typename It::pointer, const T*>::value), "");
75 static_assert((std::is_same<typename It::reference, const T&>::value), "");
76 static_assert((std::is_same<typename It::iterator_category, std::input_iterator_tag>::value), "");
77 }
78
main(int,char **)79 int main(int, char**)
80 {
81 test2<A>();
82 test3<A>();
83 test4<A>();
84 test5<A>();
85
86 return 0;
87 }
88