libcxx/test/std/language.support/support.limits/limits/numeric.limits.members/epsilon.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 // epsilon()
  12
  13 #include <limits>
  14 #include <cfloat>
  15 #include <cassert>
  16
  17 #include "test_macros.h"
  18
  19 template <class T>
  20 void
  21 test(T expected)
  22 {
  23     assert(std::numeric_limits<T>::epsilon() == expected);
  24     assert(std::numeric_limits<const T>::epsilon() == expected);
  25     assert(std::numeric_limits<volatile T>::epsilon() == expected);
  26     assert(std::numeric_limits<const volatile T>::epsilon() == expected);
  27 }
  28
  29 int main(int, char**)
  30 {
  31     test<bool>(false);
  32     test<char>(0);
  33     test<signed char>(0);
  34     test<unsigned char>(0);
  35     test<wchar_t>(0);
  36 #if TEST_STD_VER > 17 && defined(__cpp_char8_t)
  37     test<char8_t>(0);
  38 #endif
  39     test<char16_t>(0);
  40     test<char32_t>(0);
  41     test<short>(0);
  42     test<unsigned short>(0);
  43     test<int>(0);
  44     test<unsigned int>(0);
  45     test<long>(0);
  46     test<unsigned long>(0);
  47     test<long long>(0);
  48     test<unsigned long long>(0);
  49 #ifndef TEST_HAS_NO_INT128
  50     test<__int128_t>(0);
  51     test<__uint128_t>(0);
  52 #endif
  53     test<float>(FLT_EPSILON);
  54     test<double>(DBL_EPSILON);
  55     test<long double>(LDBL_EPSILON);
  56
  57   return 0;
  58 }