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1 // Copyright Louis Dionne 2013-2016
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)
5 #include <boost/hana/assert.hpp>
6 #include <boost/hana/concept/comparable.hpp>
7 #include <boost/hana/equal.hpp>
8 #include <boost/hana/not.hpp>
9 #include <boost/hana/tuple.hpp>
11 #include <laws/base.hpp>
12 #include <laws/comparable.hpp>
14 #include <type_traits>
15 namespace hana
= boost::hana
;
18 // Minimal EqualityComparable types
19 struct eq1
{ int value
; };
22 constexpr operator eq1() const { return {value
}; }
25 template <typename T
, typename U
, typename
= std::enable_if_t
<
26 (std::is_same
<T
, eq1
>{} || std::is_same
<T
, eq2
>{}) &&
27 (std::is_same
<U
, eq1
>{} || std::is_same
<U
, eq2
>{})
29 constexpr bool operator==(T a
, U b
)
30 { return a
.value
== b
.value
; }
32 template <typename T
, typename U
, typename
= std::enable_if_t
<
33 (std::is_same
<T
, eq1
>{} || std::is_same
<T
, eq2
>{}) &&
34 (std::is_same
<U
, eq1
>{} || std::is_same
<U
, eq2
>{})
36 constexpr bool operator!=(T a
, U b
)
43 // Two objects of different data types are unequal by default,
44 // and no model is provided for two objects of the same data type.
45 struct Random1
{ }; struct Random2
{ };
46 BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::equal(Random1
{}, Random2
{})));
47 static_assert(!hana::Comparable
<Random1
>::value
, "");
48 static_assert(!hana::Comparable
<Random2
>::value
, "");
50 // Provided model for EqualityComparable types
51 BOOST_HANA_CONSTEXPR_CHECK(hana::equal(eq1
{0}, eq1
{0}));
52 BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(eq1
{0}, eq1
{1})));
53 BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(eq1
{1}, eq1
{0})));
55 BOOST_HANA_CONSTEXPR_CHECK(hana::equal(eq1
{0}, eq2
{0}));
56 BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(eq1
{0}, eq2
{1})));
57 BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(eq1
{1}, eq2
{0})));
59 BOOST_HANA_CONSTEXPR_CHECK(hana::equal(eq2
{0}, eq1
{0}));
60 BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(eq2
{0}, eq1
{1})));
61 BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(eq2
{1}, eq1
{0})));
65 hana::test::TestComparable
<int>{hana::make_tuple(0,1,2,3,4,5)};
66 hana::test::TestComparable
<unsigned int>{hana::make_tuple(0u,1u,2u,3u,4u,5u)};
67 hana::test::TestComparable
<long>{hana::make_tuple(0l,1l,2l,3l,4l,5l)};
68 hana::test::TestComparable
<unsigned long>{hana::make_tuple(0ul,1ul,2ul,3ul,4ul,5ul)};
69 hana::test::TestComparable
<eq1
>{hana::make_tuple(eq1
{0}, eq1
{1}, eq1
{2}, eq1
{3}, eq1
{4})};