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/equal.hpp> 7 #include <boost/hana/flatten.hpp> 8 #include <boost/hana/optional.hpp> 9 10 #include <laws/base.hpp> 11 namespace hana = boost::hana; 12 using hana::test::ct_eq; 13 14 main()15int main() { 16 BOOST_HANA_CONSTANT_CHECK(hana::equal( 17 hana::flatten(hana::nothing), 18 hana::nothing 19 )); 20 BOOST_HANA_CONSTANT_CHECK(hana::equal( 21 hana::flatten(hana::just(hana::nothing)), 22 hana::nothing 23 )); 24 BOOST_HANA_CONSTANT_CHECK(hana::equal( 25 hana::flatten(hana::just(hana::just(ct_eq<4>{}))), 26 hana::just(ct_eq<4>{}) 27 )); 28 } 29