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/length.hpp> 8 #include <boost/hana/minimum.hpp> 9 #include <boost/hana/ordering.hpp> 10 #include <boost/hana/tuple.hpp> 11 namespace hana = boost::hana; 12 13 main()14int main() { 15 BOOST_HANA_CONSTANT_CHECK( 16 hana::minimum.by(hana::ordering(hana::length), hana::make_tuple( 17 hana::make_tuple(), 18 hana::make_tuple(1, '2'), 19 hana::make_tuple(3.3, nullptr, 4) 20 )) 21 == hana::make_tuple() 22 ); 23 } 24