libcxx/test/std/input.output/iostreams.base/ios/iostate.flags/bool.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // <ios>
  10
  11 // template <class charT, class traits> class basic_ios
  12
  13 // operator unspecified-bool-type() const;
  14
  15 #include <ios>
  16 #include <type_traits>
  17 #include <cassert>
  18
  19 #include "test_macros.h"
  20
  21 int main(int, char**)
  22 {
  23     std::ios ios(0);
  24     assert(static_cast<bool>(ios) == !ios.fail());
  25     ios.setstate(std::ios::failbit);
  26     assert(static_cast<bool>(ios) == !ios.fail());
  27     static_assert((!std::is_convertible<std::ios, int>::value), "");
  28     static_assert((!std::is_convertible<std::ios const&, int>::value), "");
  29 #if TEST_STD_VER >= 11
  30     static_assert(!std::is_convertible<std::ios, void*>::value, "");
  31     static_assert(!std::is_convertible<std::ios, bool>::value, "");
  32 #else
  33     static_assert(std::is_convertible<std::ios, void*>::value, "");
  34     static_assert(std::is_convertible<std::ios, bool>::value, "");
  35     (void)(ios == 0);  // SPEC2006 apparently relies on this to compile
  36 #endif
  37
  38   return 0;
  39 }