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
11// UNSUPPORTED: availability-filesystem-missing
12
13// FILE_DEPENDENCIES: test.dat
14
15// <fstream>
16
17// template <class charT, class traits = char_traits<charT> >
18// class basic_ifstream
19
20// template<class T>
21// explicit basic_ifstream(const T& s, ios_base::openmode mode = ios_base::in); // Since C++17
22// Constraints: is_same_v<T, filesystem::path> is true
23
24#include <cassert>
25#include <filesystem>
26#include <fstream>
27#include <type_traits>
28
29#include "test_macros.h"
30#include "test_iterators.h"
31#include "operator_hijacker.h"
32
33namespace fs = std::filesystem;
34
35template <class CharT>
36constexpr bool test_non_convert_to_path() {
37 // String types
38 static_assert(!std::is_constructible_v<std::ifstream, std::basic_string_view<CharT>>);
39 static_assert(!std::is_constructible_v<std::ifstream, const std::basic_string_view<CharT>>);
40
41 // Char* pointers
42 if constexpr (!std::is_same_v<CharT, char> && !std::is_same_v<CharT, fs::path::value_type>)
43 static_assert(!std::is_constructible_v<std::ifstream, const CharT*>);
44
45 // Iterators
46 static_assert(!std::is_convertible_v<std::ifstream, cpp17_input_iterator<const CharT*>>);
47
48 return true;
49}
50
51static_assert(test_non_convert_to_path<char>());
52
53#if !defined(TEST_HAS_NO_WIDE_CHARACTERS) && !defined(TEST_HAS_OPEN_WITH_WCHAR)
54static_assert(test_non_convert_to_path<wchar_t>());
55#endif // !TEST_HAS_NO_WIDE_CHARACTERS && !TEST_HAS_OPEN_WITH_WCHAR
56
57#ifndef TEST_HAS_NO_CHAR8_T
58static_assert(test_non_convert_to_path<char8_t>());
59#endif // TEST_HAS_NO_CHAR8_T
60
61static_assert(test_non_convert_to_path<char16_t>());
62static_assert(test_non_convert_to_path<char32_t>());
63
64int main(int, char**) {
65 {
66 fs::path p;
67 static_assert(!std::is_convertible<fs::path, std::ifstream>::value,
68 "ctor should be explicit");
69 static_assert(std::is_constructible<std::ifstream, fs::path const&,
70 std::ios_base::openmode>::value,
71 "");
72 }
73 {
74 std::ifstream fs(fs::path("test.dat"));
75 double x = 0;
76 fs >> x;
77 assert(x == 3.25);
78 }
79 {
80 std::basic_ifstream<char, operator_hijacker_char_traits<char>> fs(fs::path("test.dat"));
81 std::basic_string<char, operator_hijacker_char_traits<char> > x;
82 fs >> x;
83 assert(x == "3.25");
84 }
85 // std::ifstream(const fs::path&, std::ios_base::openmode) is tested in
86 // test/std/input.output/file.streams/fstreams/ofstream.cons/string.pass.cpp
87 // which creates writable files.
88
89#ifndef TEST_HAS_NO_WIDE_CHARACTERS
90 {
91 std::wifstream fs(fs::path("test.dat"));
92 double x = 0;
93 fs >> x;
94 assert(x == 3.25);
95 }
96 {
97 std::basic_ifstream<wchar_t, operator_hijacker_char_traits<wchar_t> > fs(fs::path("test.dat"));
98 std::basic_string<wchar_t, operator_hijacker_char_traits<wchar_t> > x;
99 fs >> x;
100 assert(x == L"3.25");
101 }
102 // std::wifstream(const fs::path&, std::ios_base::openmode) is tested in
103 // test/std/input.output/file.streams/fstreams/ofstream.cons/string.pass.cpp
104 // which creates writable files.
105#endif
106
107 return 0;
108}
109

source code of libcxx/test/std/input.output/file.streams/fstreams/ifstream.cons/path.pass.cpp