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// class istream_iterator
12
13// template <class T, class charT, class traits, class Distance>
14// bool operator==(const istream_iterator<T,charT,traits,Distance> &x,
15// const istream_iterator<T,charT,traits,Distance> &y);
16//
17// template <class T, class charT, class traits, class Distance>
18// bool operator!=(const istream_iterator<T,charT,traits,Distance> &x,
19// const istream_iterator<T,charT,traits,Distance> &y);
20//
21// friend bool operator==(const istream_iterator& i, default_sentinel_t); // since C++20
22
23#include <iterator>
24#include <sstream>
25#include <cassert>
26
27#include "test_macros.h"
28
29int main(int, char**) {
30 {
31 std::istringstream inf1(" 1 23");
32 std::istringstream inf2(" 1 23");
33 std::istream_iterator<int> i1(inf1);
34 std::istream_iterator<int> i2(inf1);
35 std::istream_iterator<int> i3(inf2);
36 std::istream_iterator<int> i4;
37 std::istream_iterator<int> i5;
38 assert(i1 == i1);
39 assert(i1 == i2);
40 assert(i1 != i3);
41 assert(i1 != i4);
42 assert(i1 != i5);
43
44 assert(i2 == i2);
45 assert(i2 != i3);
46 assert(i2 != i4);
47 assert(i2 != i5);
48
49 assert(i3 == i3);
50 assert(i3 != i4);
51 assert(i3 != i5);
52
53 assert(i4 == i4);
54 assert(i4 == i5);
55
56 assert(std::operator==(i1, i2));
57#if TEST_STD_VER <= 17
58 assert(std::operator!=(i1, i3));
59#endif
60 }
61
62#if TEST_STD_VER > 17
63 {
64 std::istream_iterator<int> i1;
65 std::istream_iterator<int> i2(std::default_sentinel);
66 assert(i1 == i2);
67
68 assert(i1 == std::default_sentinel);
69 assert(i2 == std::default_sentinel);
70 assert(std::default_sentinel == i1);
71 assert(std::default_sentinel == i2);
72 assert(!(i1 != std::default_sentinel));
73 assert(!(i2 != std::default_sentinel));
74 assert(!(std::default_sentinel != i1));
75 assert(!(std::default_sentinel != i2));
76
77 std::istringstream stream(" 1 23");
78 std::istream_iterator<int> i3(stream);
79
80 assert(!(i3 == std::default_sentinel));
81 assert(!(std::default_sentinel == i3));
82 assert(i3 != std::default_sentinel);
83 assert(std::default_sentinel != i3);
84 }
85#endif
86
87 return 0;
88}
89

source code of libcxx/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/equal.pass.cpp