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/ext/boost/tuple.hpp> 8 #include <boost/hana/integral_constant.hpp> 9 #include <boost/hana/transform.hpp> 10 11 #include <boost/tuple/tuple.hpp> 12 13 #include <string> 14 namespace hana = boost::hana; 15 16 17 struct Fish { std::string name; }; 18 struct Cat { std::string name; }; 19 struct Dog { std::string name; }; 20 main()21int main() { 22 boost::tuple<Fish, Cat, Dog> animals{{"Nemo"}, {"Garfield"}, {"Snoopy"}}; 23 hana::front(animals).name = "Moby Dick"; 24 25 auto names = hana::transform(animals, [](auto a) { 26 return a.name; 27 }); 28 29 BOOST_HANA_RUNTIME_CHECK(hana::equal( 30 names, 31 boost::make_tuple("Moby Dick", "Garfield", "Snoopy") 32 )); 33 } 34