libcxx/test/std/language.support/support.limits/limits/numeric.limits.members/digits.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 // digits
  12
  13 #include <limits>
  14 #include <cfloat>
  15
  16 #include "test_macros.h"
  17
  18 template <class T, int expected>
  19 void
  20 test()
  21 {
  22     static_assert(std::numeric_limits<T>::digits == expected, "digits test 1");
  23     static_assert(std::numeric_limits<const T>::digits == expected, "digits test 2");
  24     static_assert(std::numeric_limits<volatile T>::digits == expected, "digits test 3");
  25     static_assert(std::numeric_limits<const volatile T>::digits == expected, "digits test 4");
  26 }
  27
  28 int main(int, char**)
  29 {
  30     test<bool, 1>();
  31     test<char, std::numeric_limits<char>::is_signed ? 7 : 8>();
  32     test<signed char, 7>();
  33     test<unsigned char, 8>();
  34     test<wchar_t, std::numeric_limits<wchar_t>::is_signed ? sizeof(wchar_t)*8-1 : sizeof(wchar_t)*8>();
  35 #if TEST_STD_VER > 17 && defined(__cpp_char8_t)
  36     test<char8_t, 8>();
  37 #endif
  38     test<char16_t, 16>();
  39     test<char32_t, 32>();
  40     test<short, 15>();
  41     test<unsigned short, 16>();
  42     test<int, 31>();
  43     test<unsigned int, 32>();
  44     test<long, sizeof(long) == 4 ? 31 : 63>();
  45     test<unsigned long, sizeof(long) == 4 ? 32 : 64>();
  46     test<long long, 63>();
  47     test<unsigned long long, 64>();
  48 #ifndef TEST_HAS_NO_INT128
  49     test<__int128_t, 127>();
  50     test<__uint128_t, 128>();
  51 #endif
  52     test<float, FLT_MANT_DIG>();
  53     test<double, DBL_MANT_DIG>();
  54     test<long double, LDBL_MANT_DIG>();
  55
  56   return 0;
  57 }