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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/concat.hpp>
- #include <boost/hana/empty.hpp>
- #include <boost/hana/equal.hpp>
- #include <boost/hana/optional.hpp>
- namespace hana = boost::hana;
- static_assert(hana::concat(hana::nothing, hana::just('x')) == hana::just('x'), "");
- BOOST_HANA_CONSTANT_CHECK(hana::concat(hana::nothing, hana::nothing) == hana::nothing);
- static_assert(hana::concat(hana::just('x'), hana::just('y')) == hana::just('x'), "");
- BOOST_HANA_CONSTANT_CHECK(hana::empty<hana::optional_tag>() == hana::nothing);
- int main() { }
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