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/fold_right.hpp> 6 #include <boost/hana/optional.hpp> 7 #include <boost/hana/plus.hpp> 8 namespace hana = boost::hana; 9 10 11 static_assert(hana::fold_right(hana::nothing, 1, hana::plus) == 1, ""); 12 static_assert(hana::fold_right(hana::just(4), 1, hana::plus) == 5, ""); 13 main()14int main() { } 15