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 // XFAIL: dylib-has-no-filesystem
11 // FILE_DEPENDENCIES: test.dat
12 
13 // <fstream>
14 
15 // template <class charT, class traits = char_traits<charT> >
16 // class basic_ifstream
17 
18 // void open(const filesystem::path& s, ios_base::openmode mode = ios_base::in);
19 
20 #include <fstream>
21 #include <filesystem>
22 #include <cassert>
23 
24 #include "test_macros.h"
25 
26 int main(int, char**) {
27   {
28     std::ifstream fs;
29     assert(!fs.is_open());
30     char c = 'a';
31     fs >> c;
32     assert(fs.fail());
33     assert(c == 'a');
34     fs.open(std::filesystem::path("test.dat"));
35     assert(fs.is_open());
36     fs >> c;
37     assert(c == 'r');
38   }
39   {
40     std::wifstream fs;
41     assert(!fs.is_open());
42     wchar_t c = L'a';
43     fs >> c;
44     assert(fs.fail());
45     assert(c == L'a');
46     fs.open(std::filesystem::path("test.dat"));
47     assert(fs.is_open());
48     fs >> c;
49     assert(c == L'r');
50   }
51 
52   return 0;
53 }
54