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Diffstat (limited to 'src/boost/libs/hana/test/comparable.cpp')
-rw-r--r-- | src/boost/libs/hana/test/comparable.cpp | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/src/boost/libs/hana/test/comparable.cpp b/src/boost/libs/hana/test/comparable.cpp new file mode 100644 index 00000000..0c968a35 --- /dev/null +++ b/src/boost/libs/hana/test/comparable.cpp @@ -0,0 +1,70 @@ +// 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/comparable.hpp> +#include <boost/hana/equal.hpp> +#include <boost/hana/not.hpp> +#include <boost/hana/tuple.hpp> + +#include <laws/base.hpp> +#include <laws/comparable.hpp> + +#include <type_traits> +namespace hana = boost::hana; + + +// Minimal EqualityComparable types +struct eq1 { int value; }; +struct eq2 { + int value; + constexpr operator eq1() const { return {value}; } +}; + +template <typename T, typename U, typename = std::enable_if_t< + (std::is_same<T, eq1>{} || std::is_same<T, eq2>{}) && + (std::is_same<U, eq1>{} || std::is_same<U, eq2>{}) +>> +constexpr bool operator==(T a, U b) +{ return a.value == b.value; } + +template <typename T, typename U, typename = std::enable_if_t< + (std::is_same<T, eq1>{} || std::is_same<T, eq2>{}) && + (std::is_same<U, eq1>{} || std::is_same<U, eq2>{}) +>> +constexpr bool operator!=(T a, U b) +{ return !(a == b); } + + +int main() { + // equal + { + // Two objects of different data types are unequal by default, + // and no model is provided for two objects of the same data type. + struct Random1 { }; struct Random2 { }; + BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::equal(Random1{}, Random2{}))); + static_assert(!hana::Comparable<Random1>::value, ""); + static_assert(!hana::Comparable<Random2>::value, ""); + + // Provided model for EqualityComparable types + BOOST_HANA_CONSTEXPR_CHECK(hana::equal(eq1{0}, eq1{0})); + BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(eq1{0}, eq1{1}))); + BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(eq1{1}, eq1{0}))); + + BOOST_HANA_CONSTEXPR_CHECK(hana::equal(eq1{0}, eq2{0})); + BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(eq1{0}, eq2{1}))); + BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(eq1{1}, eq2{0}))); + + BOOST_HANA_CONSTEXPR_CHECK(hana::equal(eq2{0}, eq1{0})); + BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(eq2{0}, eq1{1}))); + BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(eq2{1}, eq1{0}))); + } + + // laws + hana::test::TestComparable<int>{hana::make_tuple(0,1,2,3,4,5)}; + hana::test::TestComparable<unsigned int>{hana::make_tuple(0u,1u,2u,3u,4u,5u)}; + hana::test::TestComparable<long>{hana::make_tuple(0l,1l,2l,3l,4l,5l)}; + hana::test::TestComparable<unsigned long>{hana::make_tuple(0ul,1ul,2ul,3ul,4ul,5ul)}; + hana::test::TestComparable<eq1>{hana::make_tuple(eq1{0}, eq1{1}, eq1{2}, eq1{3}, eq1{4})}; +} |