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++98, c++03, c++11, c++14
10 
11 // <fstream>
12 
13 // template <class charT, class traits = char_traits<charT> >
14 // class basic_ifstream
15 
16 // explicit basic_ifstream(const filesystem::path& s,
17 //     ios_base::openmode mode = ios_base::in);
18 
19 #include <fstream>
20 #include <filesystem>
21 #include <cassert>
22 
23 namespace fs = std::filesystem;
24 
25 int main(int, char**) {
26   {
27     fs::path p;
28     static_assert(!std::is_convertible<fs::path, std::ifstream>::value,
29                   "ctor should be explicit");
30     static_assert(std::is_constructible<std::ifstream, fs::path const&,
31                                         std::ios_base::openmode>::value,
32                   "");
33   }
34   {
35     std::ifstream fs(fs::path("test.dat"));
36     double x = 0;
37     fs >> x;
38     assert(x == 3.25);
39   }
40   // std::ifstream(const fs::path&, std::ios_base::openmode) is tested in
41   // test/std/input.output/file.streams/fstreams/ofstream.cons/string.pass.cpp
42   // which creates writable files.
43   {
44     std::wifstream fs(fs::path("test.dat"));
45     double x = 0;
46     fs >> x;
47     assert(x == 3.25);
48   }
49   // std::wifstream(const fs::path&, std::ios_base::openmode) is tested in
50   // test/std/input.output/file.streams/fstreams/ofstream.cons/string.pass.cpp
51   // which creates writable files.
52 
53   return 0;
54 }
55