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 // test numeric_limits
11 
12 // epsilon()
13 
14 #include <limits>
15 #include <cfloat>
16 #include <cassert>
17 
18 #include "test_macros.h"
19 
20 template <class T>
21 void
test(T expected)22 test(T expected)
23 {
24     assert(std::numeric_limits<T>::epsilon() == expected);
25     assert(std::numeric_limits<const T>::epsilon() == expected);
26     assert(std::numeric_limits<volatile T>::epsilon() == expected);
27     assert(std::numeric_limits<const volatile T>::epsilon() == expected);
28 }
29 
main()30 int main()
31 {
32     test<bool>(false);
33     test<char>(0);
34     test<signed char>(0);
35     test<unsigned char>(0);
36     test<wchar_t>(0);
37 #if TEST_STD_VER > 17 && defined(__cpp_char8_t)
38     test<char8_t>(0);
39 #endif
40 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
41     test<char16_t>(0);
42     test<char32_t>(0);
43 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
44     test<short>(0);
45     test<unsigned short>(0);
46     test<int>(0);
47     test<unsigned int>(0);
48     test<long>(0);
49     test<unsigned long>(0);
50     test<long long>(0);
51     test<unsigned long long>(0);
52 #ifndef _LIBCPP_HAS_NO_INT128
53     test<__int128_t>(0);
54     test<__uint128_t>(0);
55 #endif
56     test<float>(FLT_EPSILON);
57     test<double>(DBL_EPSILON);
58     test<long double>(LDBL_EPSILON);
59 }
60