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)
5 #include <boost/hana/assert.hpp>
6 #include <boost/hana/config.hpp>
7 #include <boost/hana/functional/flip.hpp>
8 namespace hana
= boost::hana
;
11 BOOST_HANA_CONSTEXPR_LAMBDA
auto minus
= [](int x
, int y
, int z
= 0) {
16 BOOST_HANA_CONSTEXPR_CHECK(minus(3, 0) == 3 - 0);
17 BOOST_HANA_CONSTEXPR_CHECK(hana::flip(minus
)(3, 0) == 0 - 3);
19 BOOST_HANA_CONSTEXPR_CHECK(minus(3, 0, 1) == 3 - 0 - 1);
20 BOOST_HANA_CONSTEXPR_CHECK(hana::flip(minus
)(3, 0, 1) == 0 - 3 - 1);