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 // <ios>
11 
12 // template <class charT, class traits> class basic_ios
13 
14 // bool fail() const;
15 
16 #include <ios>
17 #include <streambuf>
18 #include <cassert>
19 
20 struct testbuf : public std::streambuf {};
21 
main()22 int main()
23 {
24     {
25         std::ios ios(0);
26         assert(ios.fail());
27         ios.setstate(std::ios::eofbit);
28         assert(ios.fail());
29     }
30     {
31         testbuf sb;
32         std::ios ios(&sb);
33         assert(!ios.fail());
34         ios.setstate(std::ios::eofbit);
35         assert(!ios.fail());
36         ios.setstate(std::ios::badbit);
37         assert(ios.fail());
38         ios.setstate(std::ios::failbit);
39         assert(ios.fail());
40     }
41 }
42