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- // Copyright Louis Dionne 2013-2017
- // Distributed under the Boost Software License, Version 1.0.
- // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
- #include <boost/hana/assert.hpp>
- #include <boost/hana/concept/orderable.hpp>
- #include <boost/hana/greater.hpp>
- #include <boost/hana/greater_equal.hpp>
- #include <boost/hana/less.hpp>
- #include <boost/hana/less_equal.hpp>
- #include <boost/hana/max.hpp>
- #include <boost/hana/min.hpp>
- #include <boost/hana/not.hpp>
- #include <boost/hana/tuple.hpp>
- #include <laws/base.hpp>
- #include <laws/comparable.hpp>
- #include <laws/orderable.hpp>
- #include <string>
- #include <type_traits>
- namespace hana = boost::hana;
- using namespace std::literals;
- // Minimal LessThanComparable types
- struct ord1 { int value; };
- struct ord2 {
- int value;
- constexpr operator ord1() const { return {value}; }
- };
- template <typename T, typename U, typename = std::enable_if_t<
- (std::is_same<T, ord1>{} || std::is_same<T, ord2>{}) &&
- (std::is_same<U, ord1>{} || std::is_same<U, ord2>{})
- >>
- constexpr bool operator<(T a, U b)
- { return a.value < b.value; }
- namespace boost { namespace hana {
- template <typename T, typename U>
- struct equal_impl<T, U, when<
- (std::is_same<T, ord1>{} || std::is_same<T, ord2>{}) &&
- (std::is_same<U, ord1>{} || std::is_same<U, ord2>{})
- >> {
- static constexpr bool apply(T a, U b)
- { return a.value == b.value; }
- };
- }}
- int main() {
- // laws
- hana::test::TestOrderable<int>{hana::make_tuple(0,1,2,3,4,5)};
- hana::test::TestOrderable<unsigned int>{hana::make_tuple(0u,1u,2u,3u,4u,5u)};
- hana::test::TestOrderable<long>{hana::make_tuple(0l,1l,2l,3l,4l,5l)};
- hana::test::TestOrderable<unsigned long>{hana::make_tuple(0ul,1ul,2ul,3ul,4ul,5ul)};
- hana::test::TestOrderable<ord1>{hana::make_tuple(ord1{0}, ord1{1}, ord1{2}, ord1{3}, ord1{4})};
- // Orderable => Comparable
- hana::test::TestComparable<ord1>{hana::make_tuple(ord1{0}, ord1{1}, ord1{2}, ord1{3}, ord1{4})};
- // less
- {
- BOOST_HANA_CONSTEXPR_CHECK(hana::less(5, 6));
- BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::less(6, 6)));
- BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::less(7, 6)));
- // Provided model for LessThanComparable types
- BOOST_HANA_CONSTEXPR_CHECK(hana::less(ord1{0}, ord1{1}));
- BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::less(ord1{0}, ord1{0})));
- BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::less(ord1{1}, ord1{0})));
- BOOST_HANA_CONSTEXPR_CHECK(hana::less(ord1{0}, ord2{1}));
- BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::less(ord1{0}, ord2{0})));
- BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::less(ord1{1}, ord2{0})));
- BOOST_HANA_CONSTEXPR_CHECK(hana::less(ord2{0}, ord1{1}));
- BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::less(ord2{0}, ord1{0})));
- BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::less(ord2{1}, ord1{0})));
- BOOST_HANA_RUNTIME_CHECK(hana::less("ab", "abc"s));
- BOOST_HANA_RUNTIME_CHECK(hana::less("abc"s, "abcde"));
- }
- // greater
- {
- BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::greater(5, 6)));
- BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::greater(6, 6)));
- BOOST_HANA_CONSTEXPR_CHECK(hana::greater(7, 6));
- BOOST_HANA_RUNTIME_CHECK(hana::greater("abcd", "ab"s));
- BOOST_HANA_RUNTIME_CHECK(hana::greater("abc"s, "abb"));
- }
- // less_equal
- {
- BOOST_HANA_CONSTEXPR_CHECK(hana::less_equal(5, 6));
- BOOST_HANA_CONSTEXPR_CHECK(hana::less_equal(6, 6));
- BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::less_equal(7, 6)));
- BOOST_HANA_RUNTIME_CHECK(hana::less_equal("ab", "abcd"s));
- BOOST_HANA_RUNTIME_CHECK(hana::less_equal("abc"s, "abc"));
- }
- // greater_equal
- {
- BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::greater_equal(5, 6)));
- BOOST_HANA_CONSTEXPR_CHECK(hana::greater_equal(6, 6));
- BOOST_HANA_CONSTEXPR_CHECK(hana::greater_equal(7, 6));
- BOOST_HANA_RUNTIME_CHECK(hana::greater_equal("abcd", "ab"s));
- BOOST_HANA_RUNTIME_CHECK(hana::greater_equal("abc"s, "abc"));
- }
- // min
- {
- BOOST_HANA_CONSTEXPR_CHECK(hana::equal(hana::min(5, 6), 5));
- BOOST_HANA_CONSTEXPR_CHECK(hana::equal(hana::min(6, 5), 5));
- }
- // max
- {
- BOOST_HANA_CONSTEXPR_CHECK(hana::equal(hana::max(5, 6), 6));
- BOOST_HANA_CONSTEXPR_CHECK(hana::equal(hana::max(6, 5), 6));
- }
- }
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