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 #ifndef TEST_HAS_NO_UNICODE_CHARS
43     test<char16_t, 4>();
44     test<char32_t, 9>();
45 #endif
46     test<short, 4>();
47     test<unsigned short, 4>();
48     test<int, 9>();
49     test<unsigned int, 9>();
50     test<long, sizeof(long) == 4 ? 9 : 18>();
51     test<unsigned long, sizeof(long) == 4 ? 9 : 19>();
52     test<long long, 18>();
53     test<unsigned long long, 19>();
54 #ifndef TEST_HAS_NO_INT128
55     test<__int128_t, 38>();
56     test<__uint128_t, 38>();
57 #endif
58     test<float, FLT_DIG>();
59     test<double, DBL_DIG>();
60     test<long double, LDBL_DIG>();
61 
62   return 0;
63 }
64