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 | // <algorithm> |
10 | |
11 | // __half_positive divides an integer number by 2 as unsigned number for known types. |
12 | // It can be an important optimization for lower bound, for example. |
13 | |
14 | #include <__algorithm/half_positive.h> |
15 | #include <cassert> |
16 | #include <cstddef> |
17 | #include <limits> |
18 | |
19 | #include "test_macros.h" |
20 | #include "user_defined_integral.h" |
21 | |
22 | namespace { |
23 | |
24 | template <class IntType, class UnderlyingType = IntType> |
25 | TEST_CONSTEXPR bool test(IntType max_v = IntType(std::numeric_limits<UnderlyingType>::max())) { |
26 | return std::__half_positive(max_v) == max_v / 2; |
27 | } |
28 | |
29 | } // namespace |
30 | |
31 | int main(int, char**) |
32 | { |
33 | { |
34 | assert(test<char>()); |
35 | assert(test<int>()); |
36 | assert(test<long>()); |
37 | assert((test<UserDefinedIntegral<int>, int>())); |
38 | assert(test<std::size_t>()); |
39 | #if !defined(TEST_HAS_NO_INT128) |
40 | assert(test<__int128_t>()); |
41 | #endif // !defined(TEST_HAS_NO_INT128) |
42 | } |
43 | |
44 | #if TEST_STD_VER >= 11 |
45 | { |
46 | static_assert(test<char>(), "" ); |
47 | static_assert(test<int>(), "" ); |
48 | static_assert(test<long>(), "" ); |
49 | static_assert(test<std::size_t>(), "" ); |
50 | #if !defined(TEST_HAS_NO_INT128) |
51 | static_assert(test<__int128_t>(), "" ); |
52 | #endif // !defined(TEST_HAS_NO_INT128) |
53 | } |
54 | #endif // TEST_STD_VER >= 11 |
55 | |
56 | return 0; |
57 | } |
58 | |