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_ofstream
14
15 // template <class charT, class traits>
16 // void swap(basic_ofstream<charT, traits>& x, basic_ofstream<charT, traits>& y);
17
18 #include <fstream>
19 #include <utility>
20 #include <cassert>
21 #include "platform_support.h"
22
get_temp_file_names()23 std::pair<std::string, std::string> get_temp_file_names() {
24 std::pair<std::string, std::string> names;
25 names.first = get_temp_file_name();
26
27 // Create the file so the next call to `get_temp_file_name()` doesn't
28 // return the same file.
29 std::FILE *fd1 = std::fopen(names.first.c_str(), "w");
30
31 names.second = get_temp_file_name();
32 assert(names.first != names.second);
33
34 std::fclose(fd1);
35 std::remove(names.first.c_str());
36
37 return names;
38 }
39
main()40 int main()
41 {
42 std::pair<std::string, std::string> temp_files = get_temp_file_names();
43 std::string& temp1 = temp_files.first;
44 std::string& temp2 = temp_files.second;
45 assert(temp1 != temp2);
46 {
47 std::ofstream fs1(temp1.c_str());
48 std::ofstream fs2(temp2.c_str());
49 fs1 << 3.25;
50 fs2 << 4.5;
51 swap(fs1, fs2);
52 fs1 << ' ' << 3.25;
53 fs2 << ' ' << 4.5;
54 }
55 {
56 std::ifstream fs(temp1.c_str());
57 double x = 0;
58 fs >> x;
59 assert(x == 3.25);
60 fs >> x;
61 assert(x == 4.5);
62 }
63 std::remove(temp1.c_str());
64 {
65 std::ifstream fs(temp2.c_str());
66 double x = 0;
67 fs >> x;
68 assert(x == 4.5);
69 fs >> x;
70 assert(x == 3.25);
71 }
72 std::remove(temp2.c_str());
73 {
74 std::wofstream fs1(temp1.c_str());
75 std::wofstream fs2(temp2.c_str());
76 fs1 << 3.25;
77 fs2 << 4.5;
78 swap(fs1, fs2);
79 fs1 << ' ' << 3.25;
80 fs2 << ' ' << 4.5;
81 }
82 {
83 std::wifstream fs(temp1.c_str());
84 double x = 0;
85 fs >> x;
86 assert(x == 3.25);
87 fs >> x;
88 assert(x == 4.5);
89 }
90 std::remove(temp1.c_str());
91 {
92 std::wifstream fs(temp2.c_str());
93 double x = 0;
94 fs >> x;
95 assert(x == 4.5);
96 fs >> x;
97 assert(x == 3.25);
98 }
99 std::remove(temp2.c_str());
100 }
101