1// Copyright Louis Dionne 2013-2022
2// Distributed under the Boost Software License, Version 1.0.
3// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
4
5#include <boost/hana/assert.hpp>
6#include <boost/hana/concept/orderable.hpp>
7#include <boost/hana/greater.hpp>
8#include <boost/hana/greater_equal.hpp>
9#include <boost/hana/less.hpp>
10#include <boost/hana/less_equal.hpp>
11#include <boost/hana/max.hpp>
12#include <boost/hana/min.hpp>
13#include <boost/hana/not.hpp>
14#include <boost/hana/tuple.hpp>
15
16#include <laws/base.hpp>
17#include <laws/comparable.hpp>
18#include <laws/orderable.hpp>
19
20#include <string>
21#include <type_traits>
22namespace hana = boost::hana;
23using namespace std::literals;
24
25
26// Minimal LessThanComparable types
27struct ord1 { int value; };
28struct ord2 {
29 int value;
30 constexpr operator ord1() const { return {.value: value}; }
31};
32
33template <typename T, typename U, typename = std::enable_if_t<
34 (std::is_same<T, ord1>{} || std::is_same<T, ord2>{}) &&
35 (std::is_same<U, ord1>{} || std::is_same<U, ord2>{})
36>>
37constexpr bool operator<(T a, U b)
38{ return a.value < b.value; }
39
40namespace boost { namespace hana {
41 template <typename T, typename U>
42 struct equal_impl<T, U, when<
43 (std::is_same<T, ord1>{} || std::is_same<T, ord2>{}) &&
44 (std::is_same<U, ord1>{} || std::is_same<U, ord2>{})
45 >> {
46 static constexpr bool apply(T a, U b)
47 { return a.value == b.value; }
48 };
49}}
50
51int main() {
52 // laws
53 hana::test::TestOrderable<int>{hana::make_tuple(0,1,2,3,4,5)};
54 hana::test::TestOrderable<unsigned int>{hana::make_tuple(0u,1u,2u,3u,4u,5u)};
55 hana::test::TestOrderable<long>{hana::make_tuple(0l,1l,2l,3l,4l,5l)};
56 hana::test::TestOrderable<unsigned long>{hana::make_tuple(0ul,1ul,2ul,3ul,4ul,5ul)};
57 hana::test::TestOrderable<ord1>{hana::make_tuple(ord1{0}, ord1{1}, ord1{2}, ord1{3}, ord1{4})};
58
59 // Orderable => Comparable
60 hana::test::TestComparable<ord1>{hana::make_tuple(ord1{0}, ord1{1}, ord1{2}, ord1{3}, ord1{4})};
61
62 // less
63 {
64 BOOST_HANA_CONSTEXPR_CHECK(hana::less(5, 6));
65 BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::less(6, 6)));
66 BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::less(7, 6)));
67
68 // Provided model for LessThanComparable types
69 BOOST_HANA_CONSTEXPR_CHECK(hana::less(ord1{0}, ord1{1}));
70 BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::less(ord1{0}, ord1{0})));
71 BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::less(ord1{1}, ord1{0})));
72
73 BOOST_HANA_CONSTEXPR_CHECK(hana::less(ord1{0}, ord2{1}));
74 BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::less(ord1{0}, ord2{0})));
75 BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::less(ord1{1}, ord2{0})));
76
77 BOOST_HANA_CONSTEXPR_CHECK(hana::less(ord2{0}, ord1{1}));
78 BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::less(ord2{0}, ord1{0})));
79 BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::less(ord2{1}, ord1{0})));
80
81 BOOST_HANA_RUNTIME_CHECK(hana::less("ab", "abc"s));
82 BOOST_HANA_RUNTIME_CHECK(hana::less("abc"s, "abcde"));
83 }
84
85 // greater
86 {
87 BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::greater(5, 6)));
88 BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::greater(6, 6)));
89 BOOST_HANA_CONSTEXPR_CHECK(hana::greater(7, 6));
90
91 BOOST_HANA_RUNTIME_CHECK(hana::greater("abcd", "ab"s));
92 BOOST_HANA_RUNTIME_CHECK(hana::greater("abc"s, "abb"));
93 }
94
95 // less_equal
96 {
97 BOOST_HANA_CONSTEXPR_CHECK(hana::less_equal(5, 6));
98 BOOST_HANA_CONSTEXPR_CHECK(hana::less_equal(6, 6));
99 BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::less_equal(7, 6)));
100
101 BOOST_HANA_RUNTIME_CHECK(hana::less_equal("ab", "abcd"s));
102 BOOST_HANA_RUNTIME_CHECK(hana::less_equal("abc"s, "abc"));
103 }
104
105 // greater_equal
106 {
107 BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::greater_equal(5, 6)));
108 BOOST_HANA_CONSTEXPR_CHECK(hana::greater_equal(6, 6));
109 BOOST_HANA_CONSTEXPR_CHECK(hana::greater_equal(7, 6));
110
111 BOOST_HANA_RUNTIME_CHECK(hana::greater_equal("abcd", "ab"s));
112 BOOST_HANA_RUNTIME_CHECK(hana::greater_equal("abc"s, "abc"));
113 }
114
115 // min
116 {
117 BOOST_HANA_CONSTEXPR_CHECK(hana::equal(hana::min(5, 6), 5));
118 BOOST_HANA_CONSTEXPR_CHECK(hana::equal(hana::min(6, 5), 5));
119 }
120
121 // max
122 {
123 BOOST_HANA_CONSTEXPR_CHECK(hana::equal(hana::max(5, 6), 6));
124 BOOST_HANA_CONSTEXPR_CHECK(hana::equal(hana::max(6, 5), 6));
125 }
126}
127

source code of boost/libs/hana/test/orderable.cpp