1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// template <class T>
// constexpr bool ispow2(T x) noexcept;
// Remarks: This function shall not participate in overload resolution unless
// T is an unsigned integer type
#include <bit>
#include <cstdint>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
class A{};
enum E1 : unsigned char { rEd };
enum class E2 : unsigned char { red };
template <typename T>
constexpr bool constexpr_test()
{
return std::ispow2(T(1))
&& std::ispow2(T(2))
&& !std::ispow2(T(3))
&& std::ispow2(T(4))
&& !std::ispow2(T(5))
&& !std::ispow2(T(6))
&& !std::ispow2(T(7))
&& std::ispow2(T(8))
&& !std::ispow2(T(9))
;
}
template <typename T>
void runtime_test()
{
ASSERT_SAME_TYPE(bool, decltype(std::ispow2(T(0))));
ASSERT_NOEXCEPT( std::ispow2(T(0)));
assert(!std::ispow2(T(121)));
assert(!std::ispow2(T(122)));
assert(!std::ispow2(T(123)));
assert(!std::ispow2(T(124)));
assert(!std::ispow2(T(125)));
assert(!std::ispow2(T(126)));
assert(!std::ispow2(T(127)));
assert( std::ispow2(T(128)));
assert(!std::ispow2(T(129)));
assert(!std::ispow2(T(130)));
}
int main()
{
{
auto lambda = [](auto x) -> decltype(std::ispow2(x)) {};
using L = decltype(lambda);
static_assert( std::is_invocable_v<L, unsigned char>, "");
static_assert( std::is_invocable_v<L, unsigned int>, "");
static_assert( std::is_invocable_v<L, unsigned long>, "");
static_assert( std::is_invocable_v<L, unsigned long long>, "");
static_assert( std::is_invocable_v<L, uint8_t>, "");
static_assert( std::is_invocable_v<L, uint16_t>, "");
static_assert( std::is_invocable_v<L, uint32_t>, "");
static_assert( std::is_invocable_v<L, uint64_t>, "");
static_assert( std::is_invocable_v<L, size_t>, "");
static_assert( std::is_invocable_v<L, uintmax_t>, "");
static_assert( std::is_invocable_v<L, uintptr_t>, "");
static_assert(!std::is_invocable_v<L, int>, "");
static_assert(!std::is_invocable_v<L, signed int>, "");
static_assert(!std::is_invocable_v<L, long>, "");
static_assert(!std::is_invocable_v<L, long long>, "");
static_assert(!std::is_invocable_v<L, int8_t>, "");
static_assert(!std::is_invocable_v<L, int16_t>, "");
static_assert(!std::is_invocable_v<L, int32_t>, "");
static_assert(!std::is_invocable_v<L, int64_t>, "");
static_assert(!std::is_invocable_v<L, ptrdiff_t>, "");
static_assert(!std::is_invocable_v<L, bool>, "");
static_assert(!std::is_invocable_v<L, signed char>, "");
static_assert(!std::is_invocable_v<L, char16_t>, "");
static_assert(!std::is_invocable_v<L, char32_t>, "");
#ifndef _LIBCPP_HAS_NO_INT128
static_assert( std::is_invocable_v<L, __uint128_t>, "");
static_assert(!std::is_invocable_v<L, __int128_t>, "");
#endif
static_assert(!std::is_invocable_v<L, A>, "");
static_assert(!std::is_invocable_v<L, E1>, "");
static_assert(!std::is_invocable_v<L, E2>, "");
}
static_assert(constexpr_test<unsigned char>(), "");
static_assert(constexpr_test<unsigned short>(), "");
static_assert(constexpr_test<unsigned>(), "");
static_assert(constexpr_test<unsigned long>(), "");
static_assert(constexpr_test<unsigned long long>(), "");
static_assert(constexpr_test<uint8_t>(), "");
static_assert(constexpr_test<uint16_t>(), "");
static_assert(constexpr_test<uint32_t>(), "");
static_assert(constexpr_test<uint64_t>(), "");
static_assert(constexpr_test<size_t>(), "");
static_assert(constexpr_test<uintmax_t>(), "");
static_assert(constexpr_test<uintptr_t>(), "");
#ifndef _LIBCPP_HAS_NO_INT128
static_assert(constexpr_test<__uint128_t>(), "");
#endif
runtime_test<unsigned char>();
runtime_test<unsigned>();
runtime_test<unsigned short>();
runtime_test<unsigned long>();
runtime_test<unsigned long long>();
runtime_test<uint8_t>();
runtime_test<uint16_t>();
runtime_test<uint32_t>();
runtime_test<uint64_t>();
runtime_test<size_t>();
runtime_test<uintmax_t>();
runtime_test<uintptr_t>();
#ifndef _LIBCPP_HAS_NO_INT128
runtime_test<__uint128_t>();
{
__uint128_t val = 128;
val <<= 32;
assert(!std::ispow2(val-1));
assert( std::ispow2(val));
assert(!std::ispow2(val+1));
val <<= 2;
assert(!std::ispow2(val-1));
assert( std::ispow2(val));
assert(!std::ispow2(val+1));
val <<= 3;
assert(!std::ispow2(val-1));
assert( std::ispow2(val));
assert(!std::ispow2(val+1));
}
#endif
}
|
