ceph/src/boost/libs/hana/test/orderable.cpp

   1 // Copyright Louis Dionne 2013-2017
   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>
  22 namespace hana = boost::hana;
  23 using namespace std::literals;
  24
  25
  26 // Minimal LessThanComparable types
  27 struct ord1 { int value; };
  28 struct ord2 {
  29     int value;
  30     constexpr operator ord1() const { return {value}; }
  31 };
  32
  33 template <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 >>
  37 constexpr bool operator<(T a, U b)
  38 { return a.value < b.value; }
  39
  40 namespace 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
  51 int 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 }