nonmember_swap.pass.cpp revision 06d8bf6ce2008526732ae40ad46f7ff031c409e7 
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
22int 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