clear.pass.cpp revision bc8d3f97eb5c958007f2713238472e0c1c8fe02c 
1//===----------------------------------------------------------------------===//
2//
3// ��������������������The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// <ios>
11
12// template <class charT, class traits> class basic_ios
13
14// void clear(iostate state = goodbit);
15
16#include <ios>
17#include <streambuf>
18#include <cassert>
19
20struct testbuf : public std::streambuf {};
21
22int main()
23{
24    {
25        std::ios ios(0);
26        ios.clear();
27        assert(ios.rdstate() == std::ios::badbit);
28        try
29        {
30            ios.exceptions(std::ios::badbit);
31        }
32        catch (...)
33        {
34        }
35        try
36        {
37            ios.clear();
38            assert(false);
39        }
40        catch (std::ios::failure&)
41        {
42            assert(ios.rdstate() == std::ios::badbit);
43        }
44        try
45        {
46            ios.clear(std::ios::eofbit);
47            assert(false);
48        }
49        catch (std::ios::failure&)
50        {
51            assert(ios.rdstate() == (std::ios::eofbit | std::ios::badbit));
52        }
53    }
54    {
55        testbuf sb;
56        std::ios ios(&sb);
57        ios.clear();
58        assert(ios.rdstate() == std::ios::goodbit);
59        ios.exceptions(std::ios::badbit);
60        ios.clear();
61        assert(ios.rdstate() == std::ios::goodbit);
62        ios.clear(std::ios::eofbit);
63        assert(ios.rdstate() == std::ios::eofbit);
64    }
65}
66