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// UNSUPPORTED: no-localization
10// UNSUPPORTED: c++03, c++11, c++14, c++17
11
12// friend bool operator==(const iterator& x, default_sentinel_t);
13
14#include <cassert>
15#include <ranges>
16#include <sstream>
17
18#include "test_macros.h"
19#include "../utils.h"
20
21template <class CharT>
22void test() {
23 // fail to read
24 {
25 auto iss = make_string_stream<CharT>("a123 4");
26 std::ranges::basic_istream_view<int, CharT> isv{iss};
27 auto it = isv.begin();
28 assert(it == std::default_sentinel);
29 }
30
31 // iterate through the end
32 {
33 auto iss = make_string_stream<CharT>("123 ");
34 std::ranges::basic_istream_view<int, CharT> isv{iss};
35 auto it = isv.begin();
36 assert(it != std::default_sentinel);
37 ++it;
38 assert(it == std::default_sentinel);
39 }
40
41 // empty stream
42 {
43 auto iss = make_string_stream<CharT>("");
44 std::ranges::basic_istream_view<int, CharT> isv{iss};
45 auto it = isv.begin();
46 assert(it == std::default_sentinel);
47 }
48}
49
50int main(int, char**) {
51 test<char>();
52#ifndef TEST_HAS_NO_WIDE_CHARACTERS
53 test<wchar_t>();
54#endif
55
56 return 0;
57}
58

source code of libcxx/test/std/ranges/range.factories/range.istream.view/iterator/compare.pass.cpp