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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/chain.hpp>
- #include <boost/hana/equal.hpp>
- #include <boost/hana/optional.hpp>
- #include <laws/base.hpp>
- namespace hana = boost::hana;
- using hana::test::ct_eq;
- int main() {
- auto f = [](auto x) {
- return hana::just(hana::test::_injection<0>{}(x));
- };
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::chain(hana::just(ct_eq<3>{}), f),
- f(ct_eq<3>{})
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::chain(hana::nothing, f),
- hana::nothing
- ));
- // test with operators
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::just(ct_eq<3>{}) | f,
- f(ct_eq<3>{})
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::nothing | f,
- hana::nothing
- ));
- }
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