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_filebuf
14 
15 // void swap(basic_filebuf& rhs);
16 
17 #include <fstream>
18 #include <cassert>
19 #include "platform_support.h"
20 
21 int main()
22 {
23     std::string temp = get_temp_file_name();
24     {
25         std::filebuf f;
26         assert(f.open(temp.c_str(), std::ios_base::out | std::ios_base::in
27                                                | std::ios_base::trunc) != 0);
28         assert(f.is_open());
29         assert(f.sputn("123", 3) == 3);
30         f.pubseekoff(1, std::ios_base::beg);
31         assert(f.sgetc() == '2');
32         std::filebuf f2;
33         f2.swap(f);
34         assert(!f.is_open());
35         assert(f2.is_open());
36         assert(f2.sgetc() == '2');
37     }
38     std::remove(temp.c_str());
39     {
40         std::wfilebuf f;
41         assert(f.open(temp.c_str(), std::ios_base::out | std::ios_base::in
42                                                | std::ios_base::trunc) != 0);
43         assert(f.is_open());
44         assert(f.sputn(L"123", 3) == 3);
45         f.pubseekoff(1, std::ios_base::beg);
46         assert(f.sgetc() == L'2');
47         std::wfilebuf f2;
48         f2.swap(f);
49         assert(!f.is_open());
50         assert(f2.is_open());
51         assert(f2.sgetc() == L'2');
52     }
53     std::remove(temp.c_str());
54 }
55