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
|
// Copyright 2025 Peter Dimov
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/array.hpp>
#include <boost/config.hpp>
#include <boost/config/pragma_message.hpp>
#include <boost/config/workaround.hpp>
#include <cstddef>
#if defined(__has_include)
# if __has_include(<compare>)
# define HAS_COMPARE
# endif
#endif
#if !defined(__cpp_impl_three_way_comparison)
BOOST_PRAGMA_MESSAGE( "Test skipped because __cpp_impl_three_way_comparison is not defined" )
int main() {}
#elif !( __cpp_impl_three_way_comparison >= 201907L )
BOOST_PRAGMA_MESSAGE( "Test skipped because __cpp_impl_three_way_comparison is defined to " BOOST_STRINGIZE(__cpp_impl_three_way_comparison) )
int main() {}
#elif !defined(HAS_COMPARE)
BOOST_PRAGMA_MESSAGE( "Test skipped because <compare> is not available" )
int main() {}
#else
#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
template<class T, std::size_t N> void test1()
{
constexpr auto eq = 0 <=> 0;
constexpr boost::array<T, N> a1 = {};
constexpr boost::array<T, N> a2 = {};
STATIC_ASSERT( ( a1 <=> a2 ) == eq );
}
template<class T> void test2()
{
constexpr auto eq = 0 <=> 0;
constexpr auto lt = 0 <=> 1;
constexpr auto gt = 1 <=> 0;
{
constexpr boost::array<T, 4> a1 = {{ 1, 2, 3, 4 }};
constexpr boost::array<T, 4> a2 = {{ 1, 2, 3, 4 }};
STATIC_ASSERT( ( a1 <=> a2 ) == eq );
}
{
constexpr boost::array<T, 4> a1 = {{ 1, 2, 3, 4 }};
constexpr boost::array<T, 4> a2 = {{ 1, 2, 3, 5 }};
STATIC_ASSERT( ( a1 <=> a2 ) == lt );
}
{
constexpr boost::array<T, 4> a1 = {{ 1, 2, 3, 4 }};
constexpr boost::array<T, 4> a2 = {{ 1, 2, 3, 2 }};
STATIC_ASSERT( ( a1 <=> a2 ) == gt );
}
}
int main()
{
test1<int, 0>();
test1<int, 1>();
test1<int, 7>();
test2<int>();
}
#endif
|
