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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/core/make.hpp>
- #include <boost/hana/equal.hpp>
- #include <boost/hana/optional.hpp>
- namespace hana = boost::hana;
- int main() {
- constexpr auto x = hana::make<hana::optional_tag>();
- BOOST_HANA_CONSTANT_CHECK(x == hana::make_optional());
- BOOST_HANA_CONSTANT_CHECK(hana::is_nothing(x));
- constexpr auto just_x = hana::make<hana::optional_tag>('x');
- static_assert(just_x == hana::make_optional('x'), "");
- BOOST_HANA_CONSTANT_CHECK(hana::is_just(just_x));
- }
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