1 // Copyright Louis Dionne 2013-2017 2 // Distributed under the Boost Software License, Version 1.0. 3 // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) 4 5 #include <boost/hana/assert.hpp> 6 #include <boost/hana/empty.hpp> 7 #include <boost/hana/equal.hpp> 8 #include <boost/hana/optional.hpp> 9 namespace hana = boost::hana; 10 11 main()12int main() { 13 BOOST_HANA_CONSTANT_CHECK(hana::equal( 14 hana::empty<hana::optional_tag>(), 15 hana::nothing 16 )); 17 } 18