update sources to v12.2.3

[ceph.git] / ceph / src / boost / libs / hana / example / tuple / tuple.cpp

// Copyright Louis Dionne 2013-2017
// 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/integral_constant.hpp>
#include <boost/hana/transform.hpp>
#include <boost/hana/tuple.hpp>

#include <string>
namespace hana = boost::hana;
using namespace hana::literals;


struct Fish { std::string name; };
struct Cat  { std::string name; };
struct Dog  { std::string name; };

int main() {
    hana::tuple<Fish, Cat, Dog> animals{{"Nemo"}, {"Garfield"}, {"Snoopy"}};
    animals[0_c].name = "Moby Dick"; // can modify elements in place, like std::tuple

    auto names = hana::transform(animals, [](auto a) {
      return a.name;
    });

    BOOST_HANA_RUNTIME_CHECK(names == hana::make_tuple("Moby Dick", "Garfield", "Snoopy"));
}