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/experimental/view.hpp> 7 #include <boost/hana/is_empty.hpp> 8 #include <boost/hana/not.hpp> 9 namespace hana = boost::hana; 10 11 12 template <int> struct undefined { }; 13 main()14int main() { 15 { 16 auto single = hana::experimental::single_view(undefined<0>{}); 17 BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(single))); 18 } 19 } 20