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
20int sync_called = 0;
21
22template <class CharT>
23struct testbuf1
24    : public std::basic_streambuf<CharT>
25{
26    testbuf1() {}
27
28protected:
29
30    int virtual sync()
31    {
32        ++sync_called;
33        return 1;
34    }
35};
36
37int main()
38{
39    {
40        std::ostream os((std::streambuf*)0);
41        std::ostream::sentry s(os);
42        assert(!bool(s));
43    }
44    assert(sync_called == 0);
45    {
46        testbuf1<char> sb;
47        std::ostream os(&sb);
48        std::ostream::sentry s(os);
49        assert(bool(s));
50    }
51    assert(sync_called == 0);
52    {
53        testbuf1<char> sb;
54        std::ostream os(&sb);
55        std::ostream::sentry s(os);
56        assert(bool(s));
57        unitbuf(os);
58    }
59    assert(sync_called == 1);
60    {
61        testbuf1<char> sb;
62        std::ostream os(&sb);
63        try
64        {
65            std::ostream::sentry s(os);
66            assert(bool(s));
67            unitbuf(os);
68            throw 1;
69        }
70        catch (...)
71        {
72        }
73        assert(sync_called == 1);
74    }
75}
76