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/functional/placeholder.hpp> 6 #include <boost/hana/optional.hpp> 7 namespace hana = boost::hana; 8 9 10 static_assert(hana::maybe('x', hana::_ + 1, hana::just(1)) == 2, ""); 11 static_assert(hana::maybe('x', hana::_ + 1, hana::nothing) == 'x', ""); 12 main()13int main() { } 14