libcxx/test/std/language.support/support.limits/limits/numeric.limits.members/digits10.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 // digits10
  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>::digits10 == expected, "digits10 test 1");
  23     static_assert(std::numeric_limits<T>::is_bounded, "digits10 test 5");
  24     static_assert(std::numeric_limits<const T>::digits10 == expected, "digits10 test 2");
  25     static_assert(std::numeric_limits<const T>::is_bounded, "digits10 test 6");
  26     static_assert(std::numeric_limits<volatile T>::digits10 == expected, "digits10 test 3");
  27     static_assert(std::numeric_limits<volatile T>::is_bounded, "digits10 test 7");
  28     static_assert(std::numeric_limits<const volatile T>::digits10 == expected, "digits10 test 4");
  29     static_assert(std::numeric_limits<const volatile T>::is_bounded, "digits10 test 8");
  30 }
  31
  32 int main(int, char**)
  33 {
  34     test<bool, 0>();
  35     test<char, 2>();
  36     test<signed char, 2>();
  37     test<unsigned char, 2>();
  38     test<wchar_t, 5*sizeof(wchar_t)/2-1>();  // 4 -> 9 and 2 -> 4
  39 #if TEST_STD_VER > 17 && defined(__cpp_char8_t)
  40     test<char8_t, 2>();
  41 #endif
  42     test<char16_t, 4>();
  43     test<char32_t, 9>();
  44     test<short, 4>();
  45     test<unsigned short, 4>();
  46     test<int, 9>();
  47     test<unsigned int, 9>();
  48     test<long, sizeof(long) == 4 ? 9 : 18>();
  49     test<unsigned long, sizeof(long) == 4 ? 9 : 19>();
  50     test<long long, 18>();
  51     test<unsigned long long, 19>();
  52 #ifndef TEST_HAS_NO_INT128
  53     test<__int128_t, 38>();
  54     test<__uint128_t, 38>();
  55 #endif
  56     test<float, FLT_DIG>();
  57     test<double, DBL_DIG>();
  58     test<long double, LDBL_DIG>();
  59
  60   return 0;
  61 }