test/std/language.support/support.types/byteops/not.pass.cpp

   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 #include <cstddef>
  11 #include <test_macros.h>
  12
  13 // UNSUPPORTED: c++98, c++03, c++11, c++14
  14 // The following compilers don't like "std::byte b1{1}"
  15 // UNSUPPORTED: clang-3.5, clang-3.6, clang-3.7, clang-3.8
  16 // UNSUPPORTED: apple-clang-6, apple-clang-7, apple-clang-8.0
  17
  18 // constexpr byte operator~(byte b) noexcept;
  19
  20 int main () {
  21         constexpr std::byte b1{1};
  22         constexpr std::byte b2{2};
  23         constexpr std::byte b8{8};
  24
  25         static_assert(noexcept(~b1), "" );
  26
  27         static_assert(std::to_integer<int>(~b1) == 254, "");
  28         static_assert(std::to_integer<int>(~b2) == 253, "");
  29         static_assert(std::to_integer<int>(~b8) == 247, "");
  30 }