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/type.hpp> 8 9 #include <type_traits> 10 namespace hana = boost::hana; 11 12 13 template <typename ...> struct f { struct type; }; 14 struct x; 15 struct y; 16 17 BOOST_HANA_CONSTANT_CHECK(hana::metafunction<f>() == hana::type_c<f<>::type>); 18 BOOST_HANA_CONSTANT_CHECK(hana::metafunction<f>(hana::type_c<x>) == hana::type_c<f<x>::type>); 19 BOOST_HANA_CONSTANT_CHECK(hana::metafunction<f>(hana::type_c<x>, hana::type_c<y>) == hana::type_c<f<x, y>::type>); 20 21 static_assert(std::is_same< 22 decltype(hana::metafunction<f>)::apply<x, y>::type, 23 f<x, y>::type 24 >::value, ""); 25 main()26int main() { } 27