nonmember_swap.pass.cpp revision 256813f4e7915d64776a4edd5f4765d893b9f062 
1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. 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
21int main()
22{
23    {
24        std::fstream fs1("test1.dat", std::ios_base::in | std::ios_base::out
25                                                        | std::ios_base::trunc);
26        std::fstream fs2("test2.dat", std::ios_base::in | std::ios_base::out
27                                                        | std::ios_base::trunc);
28        fs1 << 1 << ' ' << 2;
29        fs2 << 2 << ' ' << 1;
30        fs1.seekg(0);
31        swap(fs1, fs2);
32        fs1.seekg(0);
33        int i;
34        fs1 >> i;
35        assert(i == 2);
36        fs1 >> i;
37        assert(i == 1);
38        i = 0;
39        fs2 >> i;
40        assert(i == 1);
41        fs2 >> i;
42        assert(i == 2);
43    }
44    std::remove("test1.dat");
45    std::remove("test2.dat");
46    {
47        std::wfstream fs1("test1.dat", std::ios_base::in | std::ios_base::out
48                                                         | std::ios_base::trunc);
49        std::wfstream fs2("test2.dat", std::ios_base::in | std::ios_base::out
50                                                         | std::ios_base::trunc);
51        fs1 << 1 << ' ' << 2;
52        fs2 << 2 << ' ' << 1;
53        fs1.seekg(0);
54        swap(fs1, fs2);
55        fs1.seekg(0);
56        int i;
57        fs1 >> i;
58        assert(i == 2);
59        fs1 >> i;
60        assert(i == 1);
61        i = 0;
62        fs2 >> i;
63        assert(i == 1);
64        fs2 >> i;
65        assert(i == 2);
66    }
67    std::remove("test1.dat");
68    std::remove("test2.dat");
69}
70