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// UNSUPPORTED: c++03, c++11, c++14, c++17
10
11// template <class T>
12// constexpr T bit_ceil(T x) noexcept;
13
14// Constraints: T is an unsigned integer type
15// Returns: The minimal value y such that has_single_bit(y) is true and y >= x;
16// if y is not representable as a value of type T, the result is an unspecified value.
17
18#include <bit>
19#include <cassert>
20#include <cstddef>
21#include <cstdint>
22#include <type_traits>
23
24#include "test_macros.h"
25
26struct A {};
27enum E1 : unsigned char { rEd };
28enum class E2 : unsigned char { red };
29
30template <class T>
31constexpr bool test()
32{
33 ASSERT_SAME_TYPE(decltype(std::bit_ceil(T())), T);
34 LIBCPP_ASSERT_NOEXCEPT(std::bit_ceil(T()));
35
36 assert(std::bit_ceil(T(0)) == T(1));
37 assert(std::bit_ceil(T(1)) == T(1));
38 assert(std::bit_ceil(T(2)) == T(2));
39 assert(std::bit_ceil(T(3)) == T(4));
40 assert(std::bit_ceil(T(4)) == T(4));
41 assert(std::bit_ceil(T(5)) == T(8));
42 assert(std::bit_ceil(T(6)) == T(8));
43 assert(std::bit_ceil(T(7)) == T(8));
44 assert(std::bit_ceil(T(8)) == T(8));
45 assert(std::bit_ceil(T(9)) == T(16));
46 assert(std::bit_ceil(T(60)) == T(64));
47 assert(std::bit_ceil(T(61)) == T(64));
48 assert(std::bit_ceil(T(62)) == T(64));
49 assert(std::bit_ceil(T(63)) == T(64));
50 assert(std::bit_ceil(T(64)) == T(64));
51 assert(std::bit_ceil(T(65)) == T(128));
52 assert(std::bit_ceil(T(66)) == T(128));
53 assert(std::bit_ceil(T(67)) == T(128));
54 assert(std::bit_ceil(T(68)) == T(128));
55 assert(std::bit_ceil(T(69)) == T(128));
56
57#ifndef TEST_HAS_NO_INT128
58 if constexpr (std::is_same_v<T, __uint128_t>) {
59 T val = 168;
60 T ceil = 256;
61
62 assert(std::bit_ceil(val) == ceil);
63 assert(std::bit_ceil(val << 32) == (ceil << 32));
64 assert(std::bit_ceil((val << 64) | 0x1) == (ceil << 64));
65 assert(std::bit_ceil((val << 72) | 0x1) == (ceil << 72));
66 assert(std::bit_ceil((val << 100) | 0x1) == (ceil << 100));
67 }
68#endif
69
70 return true;
71}
72
73int main(int, char**)
74{
75 {
76 auto lambda = [](auto x) -> decltype(std::bit_ceil(x)) {};
77 using L = decltype(lambda);
78
79 static_assert(!std::is_invocable_v<L, signed char>);
80 static_assert(!std::is_invocable_v<L, short>);
81 static_assert(!std::is_invocable_v<L, int>);
82 static_assert(!std::is_invocable_v<L, long>);
83 static_assert(!std::is_invocable_v<L, long long>);
84#ifndef TEST_HAS_NO_INT128
85 static_assert(!std::is_invocable_v<L, __int128_t>);
86#endif
87
88 static_assert(!std::is_invocable_v<L, std::int8_t>);
89 static_assert(!std::is_invocable_v<L, std::int16_t>);
90 static_assert(!std::is_invocable_v<L, std::int32_t>);
91 static_assert(!std::is_invocable_v<L, std::int64_t>);
92 static_assert(!std::is_invocable_v<L, std::intmax_t>);
93 static_assert(!std::is_invocable_v<L, std::intptr_t>);
94 static_assert(!std::is_invocable_v<L, std::ptrdiff_t>);
95
96 static_assert(!std::is_invocable_v<L, bool>);
97 static_assert(!std::is_invocable_v<L, char>);
98 static_assert(!std::is_invocable_v<L, wchar_t>);
99#ifndef TEST_HAS_NO_CHAR8_T
100 static_assert(!std::is_invocable_v<L, char8_t>);
101#endif
102 static_assert(!std::is_invocable_v<L, char16_t>);
103 static_assert(!std::is_invocable_v<L, char32_t>);
104
105 static_assert(!std::is_invocable_v<L, A>);
106 static_assert(!std::is_invocable_v<L, A*>);
107 static_assert(!std::is_invocable_v<L, E1>);
108 static_assert(!std::is_invocable_v<L, E2>);
109 }
110
111 static_assert(test<unsigned char>());
112 static_assert(test<unsigned short>());
113 static_assert(test<unsigned int>());
114 static_assert(test<unsigned long>());
115 static_assert(test<unsigned long long>());
116#ifndef TEST_HAS_NO_INT128
117 static_assert(test<__uint128_t>());
118#endif
119 static_assert(test<std::uint8_t>());
120 static_assert(test<std::uint16_t>());
121 static_assert(test<std::uint32_t>());
122 static_assert(test<std::uint64_t>());
123 static_assert(test<std::uintmax_t>());
124 static_assert(test<std::uintptr_t>());
125 static_assert(test<std::size_t>());
126
127 test<unsigned char>();
128 test<unsigned short>();
129 test<unsigned int>();
130 test<unsigned long>();
131 test<unsigned long long>();
132#ifndef TEST_HAS_NO_INT128
133 test<__uint128_t>();
134#endif
135 test<std::uint8_t>();
136 test<std::uint16_t>();
137 test<std::uint32_t>();
138 test<std::uint64_t>();
139 test<std::uintmax_t>();
140 test<std::uintptr_t>();
141 test<std::size_t>();
142
143 return 0;
144}
145

source code of libcxx/test/std/numerics/bit/bit.pow.two/bit_ceil.pass.cpp