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