40 lines · 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-exception6//7//===----------------------------------------------------------------------===//8 9// <ios>10 11// template <class charT, class traits> class basic_ios12 13// operator unspecified-bool-type() const;14 15#include <ios>16#include <type_traits>17#include <cassert>18 19#include "test_macros.h"20 21int 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 >= 1130 static_assert(!std::is_convertible<std::ios, void*>::value, "");31 static_assert(!std::is_convertible<std::ios, bool>::value, "");32#else33 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 compile36#endif37 38 return 0;39}40