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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)
#ifndef BOOST_HANA_TEST_LAWS_COMPARABLE_HPP
#define BOOST_HANA_TEST_LAWS_COMPARABLE_HPP
#include <boost/hana/and.hpp>
#include <boost/hana/assert.hpp>
#include <boost/hana/bool.hpp>
#include <boost/hana/comparing.hpp>
#include <boost/hana/concept/comparable.hpp>
#include <boost/hana/concept/constant.hpp>
#include <boost/hana/concept/product.hpp>
#include <boost/hana/concept/sequence.hpp>
#include <boost/hana/core/make.hpp>
#include <boost/hana/core/when.hpp>
#include <boost/hana/equal.hpp>
#include <boost/hana/first.hpp>
#include <boost/hana/for_each.hpp>
#include <boost/hana/lazy.hpp>
#include <boost/hana/not_equal.hpp>
#include <boost/hana/second.hpp>
#include <boost/hana/value.hpp>
#include <laws/base.hpp>
namespace boost { namespace hana { namespace test {
template <typename T, typename = hana::when<true>>
struct TestComparable : TestComparable<T, laws> {
using TestComparable<T, laws>::TestComparable;
};
template <typename T>
struct TestComparable<T, laws> {
template <typename Xs>
TestComparable(Xs xs) {
hana::for_each(xs, [](auto x) {
static_assert(hana::Comparable<decltype(x)>{}, "");
});
foreach2(xs, [](auto a, auto b) {
// reflexivity
BOOST_HANA_CHECK(
hana::equal(a, a)
);
// symmetry
BOOST_HANA_CHECK(
hana::equal(a, b) ^implies^ hana::equal(b, a)
);
// `not_equal` is the negation of `equal`
BOOST_HANA_CHECK(
hana::not_equal(a, b) ^iff^ hana::not_(hana::equal(a, b))
);
// equal.to and not_equal.to
BOOST_HANA_CHECK(
hana::equal.to(a)(b) ^iff^ hana::equal(a, b)
);
BOOST_HANA_CHECK(
hana::not_equal.to(a)(b) ^iff^ hana::not_equal(a, b)
);
// comparing
_injection<0> f{};
BOOST_HANA_CHECK(
hana::comparing(f)(a, b) ^iff^ hana::equal(f(a), f(b))
);
});
// transitivity
foreach3(xs, [](auto a, auto b, auto c) {
BOOST_HANA_CHECK(
hana::and_(hana::equal(a, b), hana::equal(b, c))
^implies^ hana::equal(a, c)
);
});
}
};
template <typename C>
struct TestComparable<C, when<Constant<C>::value>>
: TestComparable<C, laws>
{
template <typename Xs>
TestComparable(Xs xs) : TestComparable<C, laws>{xs} {
foreach2(xs, [](auto a, auto b) {
BOOST_HANA_CHECK(
hana::value(hana::equal(a, b)) ^iff^
hana::equal(hana::value(a), hana::value(b))
);
});
}
};
template <typename P>
struct TestComparable<P, when<Product<P>::value>>
: TestComparable<P, laws>
{
template <typename Products>
TestComparable(Products products) : TestComparable<P, laws>{products} {
foreach2(products, [](auto x, auto y) {
BOOST_HANA_CHECK(
hana::equal(x, y) ^iff^
hana::and_(
hana::equal(hana::first(x), hana::first(y)),
hana::equal(hana::second(x), hana::second(y))
)
);
});
}
};
template <typename S>
struct TestComparable<S, when<Sequence<S>::value>>
: TestComparable<S, laws>
{
template <int i>
using x = _constant<i>;
template <typename Xs>
TestComparable(Xs xs) : TestComparable<S, laws>{xs} {
constexpr auto list = make<S>;
//////////////////////////////////////////////////////////////////
// equal
//////////////////////////////////////////////////////////////////
BOOST_HANA_CONSTANT_CHECK(hana::equal(
list(),
list()
));
BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::equal(
list(x<0>{}),
list()
)));
BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::equal(
list(),
list(x<0>{})
)));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
list(x<0>{}),
list(x<0>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::equal(
list(x<0>{}, x<1>{}),
list(x<0>{})
)));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
list(x<0>{}, x<1>{}),
list(x<0>{}, x<1>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::equal(
list(x<0>{}, x<1>{}, x<2>{}, x<3>{}),
list(x<0>{}, x<1>{}, x<2>{}, x<4>{})
)));
}
};
}}} // end namespace boost::hana::test
#endif // !BOOST_HANA_TEST_LAWS_COMPARABLE_HPP
|
