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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/integral_constant.hpp> | |
8 | #include <boost/hana/transform.hpp> | |
9 | #include <boost/hana/tuple.hpp> | |
10 | ||
11 | #include <string> | |
12 | namespace hana = boost::hana; | |
13 | using namespace hana::literals; | |
14 | ||
15 | ||
16 | struct Fish { std::string name; }; | |
17 | struct Cat { std::string name; }; | |
18 | struct Dog { std::string name; }; | |
19 | ||
20 | int main() { | |
21 | hana::tuple<Fish, Cat, Dog> animals{{"Nemo"}, {"Garfield"}, {"Snoopy"}}; | |
22 | animals[0_c].name = "Moby Dick"; // can modify elements in place, like std::tuple | |
23 | ||
24 | auto names = hana::transform(animals, [](auto a) { | |
25 | return a.name; | |
26 | }); | |
27 | ||
28 | BOOST_HANA_RUNTIME_CHECK(names == hana::make_tuple("Moby Dick", "Garfield", "Snoopy")); | |
29 | } |