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 // template <class charT, class traits>
16 //   void swap(basic_fstream<charT, traits>& x, basic_fstream<charT, traits>& y);
17 
18 #include <fstream>
19 #include <cassert>
20 #include "platform_support.h"
21 
22 int main()
23 {
24     std::string temp1 = get_temp_file_name();
25     std::string temp2 = get_temp_file_name();
26     {
27         std::fstream fs1(temp1.c_str(), std::ios_base::in | std::ios_base::out
28                                                   | std::ios_base::trunc);
29         std::fstream fs2(temp2.c_str(), std::ios_base::in | std::ios_base::out
30                                                   | std::ios_base::trunc);
31         fs1 << 1 << ' ' << 2;
32         fs2 << 2 << ' ' << 1;
33         fs1.seekg(0);
34         swap(fs1, fs2);
35         fs1.seekg(0);
36         int i;
37         fs1 >> i;
38         assert(i == 2);
39         fs1 >> i;
40         assert(i == 1);
41         i = 0;
42         fs2 >> i;
43         assert(i == 1);
44         fs2 >> i;
45         assert(i == 2);
46     }
47     std::remove(temp1.c_str());
48     std::remove(temp2.c_str());
49     {
50         std::wfstream fs1(temp1.c_str(), std::ios_base::in | std::ios_base::out
51                                                    | std::ios_base::trunc);
52         std::wfstream fs2(temp2.c_str(), std::ios_base::in | std::ios_base::out
53                                                    | std::ios_base::trunc);
54         fs1 << 1 << ' ' << 2;
55         fs2 << 2 << ' ' << 1;
56         fs1.seekg(0);
57         swap(fs1, fs2);
58         fs1.seekg(0);
59         int i;
60         fs1 >> i;
61         assert(i == 2);
62         fs1 >> i;
63         assert(i == 1);
64         i = 0;
65         fs2 >> i;
66         assert(i == 1);
67         fs2 >> i;
68         assert(i == 2);
69     }
70     std::remove(temp1.c_str());
71     std::remove(temp2.c_str());
72 }
73