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// std::views::istream<T>
13
14#include <cassert>
15#include <ranges>
16#include <sstream>
17#include <type_traits>
18
19#include "test_macros.h"
20#include "utils.h"
21
22static_assert(!std::is_invocable_v<decltype((std::views::istream<int>))>);
23static_assert(std::is_invocable_v<decltype((std::views::istream<int>)), std::istream&>);
24static_assert(!std::is_invocable_v<decltype((std::views::istream<int>)), const std::istream&>);
25static_assert(!std::is_invocable_v<decltype((std::views::istream<int>)), int>);
26
27#ifndef TEST_HAS_NO_WIDE_CHARACTERS
28static_assert(std::is_invocable_v<decltype((std::views::istream<int>)), std::wistream&>);
29static_assert(!std::is_invocable_v<decltype((std::views::istream<int>)), const std::wistream&>);
30#endif
31
32template <class CharT>
33void test() {
34 auto iss = make_string_stream<CharT>("12 3");
35 auto isv = std::views::istream<int>(iss);
36 auto it = isv.begin();
37 assert(*it == 12);
38}
39
40int main(int, char**) {
41 test<char>();
42#ifndef TEST_HAS_NO_WIDE_CHARACTERS
43 test<wchar_t>();
44#endif
45
46 return 0;
47}
48

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