ceph/src/boost/libs/hana/example/ext/boost/fusion/deque.cpp

   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/fusion/deque.hpp>
   8 #include <boost/hana/integral_constant.hpp>
   9 #include <boost/hana/transform.hpp>
  10
  11 #include <boost/fusion/include/deque.hpp>
  12 #include <boost/fusion/include/make_deque.hpp>
  13
  14 #include <string>
  15 namespace fusion = boost::fusion;
  16 namespace hana = boost::hana;
  17
  18
  19 struct Fish { std::string name; };
  20 struct Cat  { std::string name; };
  21 struct Dog  { std::string name; };
  22
  23 int main() {
  24     fusion::deque<Fish, Cat, Dog> animals{{"Nemo"}, {"Garfield"}, {"Snoopy"}};
  25     hana::front(animals).name = "Moby Dick";
  26
  27     auto names = hana::transform(animals, [](auto a) {
  28       return a.name;
  29     });
  30
  31     BOOST_HANA_RUNTIME_CHECK(hana::equal(
  32         names,
  33         fusion::make_deque("Moby Dick", "Garfield", "Snoopy")
  34     ));
  35 }