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: c++03, c++11, c++14
10 // UNSUPPORTED: no-localization
11 // UNSUPPORTED: availability-filesystem-missing
12
13 // <filesystem>
14
15 // class path
16
17 // template <class charT, class traits>
18 // basic_ostream<charT, traits>&
19 // operator<<(basic_ostream<charT, traits>& os, const path& p);
20 //
21 // template <class charT, class traits>
22 // basic_istream<charT, traits>&
23 // operator>>(basic_istream<charT, traits>& is, path& p)
24 //
25
26 #include <filesystem>
27 #include <type_traits>
28 #include <sstream>
29 #include <cassert>
30 #include <iostream>
31
32 #include "count_new.h"
33 #include "make_string.h"
34 #include "test_iterators.h"
35 #include "test_macros.h"
36 namespace fs = std::filesystem;
37
38 MultiStringType InStr = MKSTR("abcdefg/\"hijklmnop\"/qrstuvwxyz/123456789");
39 MultiStringType OutStr = MKSTR("\"abcdefg/\\\"hijklmnop\\\"/qrstuvwxyz/123456789\"");
40
41 template <class CharT>
doIOTest()42 void doIOTest() {
43 using namespace fs;
44 using Ptr = const CharT*;
45 using StrStream = std::basic_stringstream<CharT>;
46 const Ptr E = OutStr;
47 const path p((const char*)InStr);
48 StrStream ss;
49 { // test output
50 auto& ret = (ss << p);
51 assert(ss.str() == E);
52 assert(&ret == &ss);
53 }
54 { // test input
55 path p_in;
56 auto& ret = ss >> p_in;
57 assert(p_in.native() == (const path::value_type*)InStr);
58 assert(&ret == &ss);
59 }
60 }
61
62 namespace impl {
63 using namespace fs;
64
65 template <class Stream, class Tp, class = decltype(std::declval<Stream&>() << std::declval<Tp&>())>
66 std::true_type is_ostreamable_imp(int);
67
68 template <class Stream, class Tp>
69 std::false_type is_ostreamable_imp(long);
70
71 template <class Stream, class Tp, class = decltype(std::declval<Stream&>() >> std::declval<Tp&>())>
72 std::true_type is_istreamable_imp(int);
73
74 template <class Stream, class Tp>
75 std::false_type is_istreamable_imp(long);
76
77
78 } // namespace impl
79
80 template <class Stream, class Tp>
81 struct is_ostreamable : decltype(impl::is_ostreamable_imp<Stream, Tp>(0)) {};
82 template <class Stream, class Tp>
83 struct is_istreamable : decltype(impl::is_istreamable_imp<Stream, Tp>(0)) {};
84
test_LWG2989()85 void test_LWG2989() {
86 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
87 static_assert(!is_ostreamable<decltype(std::cout), std::wstring>::value, "");
88 static_assert(!is_ostreamable<decltype(std::wcout), std::string>::value, "");
89 static_assert(!is_istreamable<decltype(std::cin), std::wstring>::value, "");
90 static_assert(!is_istreamable<decltype(std::wcin), std::string>::value, "");
91 #endif
92 }
93
main(int,char **)94 int main(int, char**) {
95 doIOTest<char>();
96 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
97 doIOTest<wchar_t>();
98 #endif
99 // TODO(var-const): uncomment when it becomes possible to instantiate a `basic_ostream` object with a sized character
100 // type (see https://llvm.org/PR53119).
101 //doIOTest<char16_t>();
102 //doIOTest<char32_t>();
103 test_LWG2989();
104
105 return 0;
106 }
107