libcxx/test/std/language.support/support.limits/limits/numeric.limits.members/is_signed.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 // test numeric_limits
  10
  11 // is_signed
  12
  13 #include <limits>
  14
  15 #include "test_macros.h"
  16
  17 template <class T, bool expected>
  18 void
  19 test()
  20 {
  21     static_assert(std::numeric_limits<T>::is_signed == expected, "is_signed test 1");
  22     static_assert(std::numeric_limits<const T>::is_signed == expected, "is_signed test 2");
  23     static_assert(std::numeric_limits<volatile T>::is_signed == expected, "is_signed test 3");
  24     static_assert(std::numeric_limits<const volatile T>::is_signed == expected, "is_signed test 4");
  25 }
  26
  27 int main(int, char**)
  28 {
  29     test<bool, false>();
  30     test<char, char(-1) < char(0)>();
  31     test<signed char, true>();
  32     test<unsigned char, false>();
  33     test<wchar_t, wchar_t(-1) < wchar_t(0)>();
  34 #if TEST_STD_VER > 17 && defined(__cpp_char8_t)
  35     test<char8_t, false>();
  36 #endif
  37     test<char16_t, false>();
  38     test<char32_t, false>();
  39     test<short, true>();
  40     test<unsigned short, false>();
  41     test<int, true>();
  42     test<unsigned int, false>();
  43     test<long, true>();
  44     test<unsigned long, false>();
  45     test<long long, true>();
  46     test<unsigned long long, false>();
  47 #ifndef TEST_HAS_NO_INT128
  48     test<__int128_t, true>();
  49     test<__uint128_t, false>();
  50 #endif
  51     test<float, true>();
  52     test<double, true>();
  53     test<long double, true>();
  54
  55   return 0;
  56 }