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