1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // UNSUPPORTED: c++98, c++03, c++11, c++14
11 
12 // <fstream>
13 
14 // plate <class charT, class traits = char_traits<charT> >
15 // class basic_fstream
16 
17 // void open(const filesystem::path& s, ios_base::openmode mode = ios_base::in|ios_base::out);
18 
19 #include <fstream>
20 #include <filesystem>
21 #include <cassert>
22 #include "platform_support.h"
23 
main()24 int main() {
25   std::filesystem::path p = get_temp_file_name();
26   {
27     std::fstream stream;
28     assert(!stream.is_open());
29     stream.open(p,
30                 std::ios_base::in | std::ios_base::out | std::ios_base::trunc);
31     assert(stream.is_open());
32     double x = 0;
33     stream << 3.25;
34     stream.seekg(0);
35     stream >> x;
36     assert(x == 3.25);
37   }
38   std::remove(p.c_str());
39   {
40     std::wfstream stream;
41     assert(!stream.is_open());
42     stream.open(p,
43                 std::ios_base::in | std::ios_base::out | std::ios_base::trunc);
44     assert(stream.is_open());
45     double x = 0;
46     stream << 3.25;
47     stream.seekg(0);
48     stream >> x;
49     assert(x == 3.25);
50   }
51   std::remove(p.c_str());
52 }
53