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 // <ostream>
11 
12 // template <class charT, class traits = char_traits<charT> >
13 // class basic_ostream::sentry;
14 
15 // ~sentry();
16 
17 #include <ostream>
18 #include <cassert>
19 
20 #include "test_macros.h"
21 
22 int sync_called = 0;
23 
24 template <class CharT>
25 struct testbuf1
26     : public std::basic_streambuf<CharT>
27 {
testbuf1testbuf128     testbuf1() {}
29 
30 protected:
31 
synctestbuf132     int virtual sync()
33     {
34         ++sync_called;
35         return 1;
36     }
37 };
38 
main()39 int main()
40 {
41     {
42         std::ostream os((std::streambuf*)0);
43         std::ostream::sentry s(os);
44         assert(!bool(s));
45     }
46     assert(sync_called == 0);
47     {
48         testbuf1<char> sb;
49         std::ostream os(&sb);
50         std::ostream::sentry s(os);
51         assert(bool(s));
52     }
53     assert(sync_called == 0);
54     {
55         testbuf1<char> sb;
56         std::ostream os(&sb);
57         std::ostream::sentry s(os);
58         assert(bool(s));
59         unitbuf(os);
60     }
61     assert(sync_called == 1);
62 #ifndef TEST_HAS_NO_EXCEPTIONS
63     {
64         testbuf1<char> sb;
65         std::ostream os(&sb);
66         try
67         {
68             std::ostream::sentry s(os);
69             assert(bool(s));
70             unitbuf(os);
71             throw 1;
72         }
73         catch (...)
74         {
75         }
76         assert(sync_called == 1);
77     }
78 #endif
79 }
80