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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_COMONAD_HPP
- #define BOOST_HANA_TEST_LAWS_COMONAD_HPP
- #include <boost/hana/assert.hpp>
- #include <boost/hana/concept/comonad.hpp>
- #include <boost/hana/concept/comparable.hpp>
- #include <boost/hana/core/when.hpp>
- #include <boost/hana/concept/foldable.hpp>
- #include <boost/hana/concept/functor.hpp>
- #include <laws/base.hpp>
- namespace boost { namespace hana { namespace test {
- template <typename W, typename = when<true>>
- struct TestComonad : TestComonad<W, laws> {
- using TestComonad<W, laws>::TestComonad;
- };
- template <typename W>
- struct TestComonad<W, laws> {
- template <typename Ws>
- TestComonad(Ws ws) {
- hana::for_each(ws, [](auto w) {
- static_assert(Comonad<decltype(w)>{}, "");
- // extract(duplicate(w)) == w
- BOOST_HANA_CHECK(hana::equal(
- hana::extract(hana::duplicate(w)),
- w
- ));
- // transform(duplicate(w), extract) == w
- BOOST_HANA_CHECK(hana::equal(
- hana::transform(hana::duplicate(w), extract),
- w
- ));
- // duplicate(duplicate(w)) == transform(duplicate(w), duplicate)
- BOOST_HANA_CHECK(hana::equal(
- hana::duplicate(hana::duplicate(w)),
- hana::transform(hana::duplicate(w), duplicate)
- ));
- });
- }
- };
- }}} // end namespace boost::hana::test
- #endif // !BOOST_HANA_TEST_LAWS_COMONAD_HPP
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