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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/equal.hpp>
- #include <boost/hana/find_if.hpp>
- #include <boost/hana/optional.hpp>
- #include <laws/base.hpp>
- namespace hana = boost::hana;
- using hana::test::ct_eq;
- int main() {
- ct_eq<2> x{};
- ct_eq<3> y{};
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::find_if(hana::just(x), hana::equal.to(x)),
- hana::just(x)
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::find_if(hana::just(x), hana::equal.to(y)),
- hana::nothing
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::find_if(hana::nothing, hana::equal.to(x)),
- hana::nothing
- ));
- // Previously, there was a bug that would make this fail.
- auto non_const_nothing = hana::nothing;
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::find_if(non_const_nothing, hana::equal.to(x)),
- hana::nothing
- ));
- }
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