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 // <fstream>
10 
11 // template <class charT, class traits = char_traits<charT> >
12 // class basic_fstream
13 
14 // void open(const char* s, ios_base::openmode mode = ios_base::in|ios_base::out);
15 
16 #include <fstream>
17 #include <cassert>
18 #include "platform_support.h"
19 
20 int main(int, char**)
21 {
22     std::string temp = get_temp_file_name();
23     {
24         std::fstream fs;
25         assert(!fs.is_open());
26         fs.open(temp.c_str(), std::ios_base::in | std::ios_base::out
27                                         | std::ios_base::trunc);
28         assert(fs.is_open());
29         double x = 0;
30         fs << 3.25;
31         fs.seekg(0);
32         fs >> x;
33         assert(x == 3.25);
34     }
35     std::remove(temp.c_str());
36     {
37         std::wfstream fs;
38         assert(!fs.is_open());
39         fs.open(temp.c_str(), std::ios_base::in | std::ios_base::out
40                                         | std::ios_base::trunc);
41         assert(fs.is_open());
42         double x = 0;
43         fs << 3.25;
44         fs.seekg(0);
45         fs >> x;
46         assert(x == 3.25);
47     }
48     std::remove(temp.c_str());
49 
50   return 0;
51 }
52