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 <cstddef>
26#include <type_traits>
27
28#include "test_macros.h"
29
30struct A {};
31
32template <class T>
33void
34test2()
35{
36 typedef std::iterator<std::forward_iterator_tag, T> It;
37 static_assert((std::is_same<typename It::value_type, T>::value), "");
38 static_assert((std::is_same<typename It::difference_type, std::ptrdiff_t>::value), "");
39 static_assert((std::is_same<typename It::pointer, T*>::value), "");
40 static_assert((std::is_same<typename It::reference, T&>::value), "");
41 static_assert((std::is_same<typename It::iterator_category, std::forward_iterator_tag>::value), "");
42}
43
44template <class T>
45void
46test3()
47{
48 typedef std::iterator<std::bidirectional_iterator_tag, T, short> It;
49 static_assert((std::is_same<typename It::value_type, T>::value), "");
50 static_assert((std::is_same<typename It::difference_type, short>::value), "");
51 static_assert((std::is_same<typename It::pointer, T*>::value), "");
52 static_assert((std::is_same<typename It::reference, T&>::value), "");
53 static_assert((std::is_same<typename It::iterator_category, std::bidirectional_iterator_tag>::value), "");
54}
55
56template <class T>
57void
58test4()
59{
60 typedef std::iterator<std::random_access_iterator_tag, T, int, const T*> It;
61 static_assert((std::is_same<typename It::value_type, T>::value), "");
62 static_assert((std::is_same<typename It::difference_type, int>::value), "");
63 static_assert((std::is_same<typename It::pointer, const T*>::value), "");
64 static_assert((std::is_same<typename It::reference, T&>::value), "");
65 static_assert((std::is_same<typename It::iterator_category, std::random_access_iterator_tag>::value), "");
66}
67
68template <class T>
69void
70test5()
71{
72 typedef std::iterator<std::input_iterator_tag, T, long, const T*, const T&> It;
73 static_assert((std::is_same<typename It::value_type, T>::value), "");
74 static_assert((std::is_same<typename It::difference_type, long>::value), "");
75 static_assert((std::is_same<typename It::pointer, const T*>::value), "");
76 static_assert((std::is_same<typename It::reference, const T&>::value), "");
77 static_assert((std::is_same<typename It::iterator_category, std::input_iterator_tag>::value), "");
78}
79
80int main(int, char**)
81{
82 test2<A>();
83 test3<A>();
84 test4<A>();
85 test5<A>();
86
87 return 0;
88}
89

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