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 operator!() const;
15 
16 #include <ios>
17 #include <cassert>
18 
main()19 int main()
20 {
21     std::ios ios(0);
22     assert(!ios == ios.fail());
23     ios.setstate(std::ios::failbit);
24     assert(!ios == ios.fail());
25 }
26