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/integral_constant.hpp> 6 #include <boost/hana/value.hpp> 7 namespace hana = boost::hana; 8 9 main()10int main() { 11 auto i = hana::integral_c<int, 3>; // notice no constexpr 12 static_assert(hana::value<decltype(i)>() == 3, ""); 13 static_assert(hana::value(i) == 3, "value(i) is always a constant expression!"); 14 } 15