text: // Copyright Louis Dionne 2013-2016
  // Distributed under the Boost Software License, Version 1.0.
  // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
  
  #include <boost/hana/assert.hpp>
  #include <boost/hana/equal.hpp>
  #include <boost/hana/ext/boost/tuple.hpp>
  #include <boost/hana/integral_constant.hpp>
  #include <boost/hana/transform.hpp>
  
  #include <boost/tuple/tuple.hpp>
  
  #include <string>
  namespace hana = boost::hana;
  
  
  struct Fish { std::string name; };
  struct Cat  { std::string name; };
  struct Dog  { std::string name; };
  
  int main() {
      boost::tuple<Fish, Cat, Dog> animals{{"Nemo"}, {"Garfield"}, {"Snoopy"}};
      hana::front(animals).name = "Moby Dick";
  
      auto names = hana::transform(animals, [](auto a) {
        return a.name;
      });
  
      BOOST_HANA_RUNTIME_CHECK(hana::equal(
          names,
          boost::make_tuple("Moby Dick", "Garfield", "Snoopy")
      ));
  }
  