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/integral_constant.hpp> 7 #include <boost/hana/is_empty.hpp> 8 #include <boost/hana/not.hpp> 9 #include <boost/hana/string.hpp> 10 namespace hana = boost::hana; 11 12 main()13int main() { 14 BOOST_HANA_CONSTANT_CHECK(hana::is_empty(BOOST_HANA_STRING(""))); 15 BOOST_HANA_CONSTANT_CHECK(hana::is_empty(hana::string_c<>)); 16 17 BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(BOOST_HANA_STRING("a")))); 18 BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(BOOST_HANA_STRING("ab")))); 19 BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(BOOST_HANA_STRING("abc")))); 20 BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(hana::string_c<'a'>))); 21 } 22