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/experimental/view.hpp> 8 #include <boost/hana/integral_constant.hpp> 9 #include <boost/hana/length.hpp> 10 namespace hana = boost::hana; 11 12 13 template <int> struct undefined { }; 14 main()15int main() { 16 { 17 auto single = hana::experimental::single_view(undefined<0>{}); 18 BOOST_HANA_CONSTANT_CHECK(hana::equal( 19 hana::length(single), 20 hana::size_c<1> 21 )); 22 } 23 } 24