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 // XFAIL: libcpp-no-exceptions
11 // <ostream>
12 
13 // template <class charT, class traits = char_traits<charT> >
14 // class basic_ostream::sentry;
15 
16 // ~sentry();
17 
18 #include <ostream>
19 #include <cassert>
20 
21 int sync_called = 0;
22 
23 template <class CharT>
24 struct testbuf1
25     : public std::basic_streambuf<CharT>
26 {
27     testbuf1() {}
28 
29 protected:
30 
31     int virtual sync()
32     {
33         ++sync_called;
34         return 1;
35     }
36 };
37 
38 int main()
39 {
40     {
41         std::ostream os((std::streambuf*)0);
42         std::ostream::sentry s(os);
43         assert(!bool(s));
44     }
45     assert(sync_called == 0);
46     {
47         testbuf1<char> sb;
48         std::ostream os(&sb);
49         std::ostream::sentry s(os);
50         assert(bool(s));
51     }
52     assert(sync_called == 0);
53     {
54         testbuf1<char> sb;
55         std::ostream os(&sb);
56         std::ostream::sentry s(os);
57         assert(bool(s));
58         unitbuf(os);
59     }
60     assert(sync_called == 1);
61     {
62         testbuf1<char> sb;
63         std::ostream os(&sb);
64         try
65         {
66             std::ostream::sentry s(os);
67             assert(bool(s));
68             unitbuf(os);
69             throw 1;
70         }
71         catch (...)
72         {
73         }
74         assert(sync_called == 1);
75     }
76 }
77