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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/config.hpp> | |
7 | #include <boost/hana/core/to.hpp> | |
8 | #include <boost/hana/equal.hpp> | |
9 | #include <boost/hana/tuple.hpp> | |
10 | namespace hana = boost::hana; | |
11 | ||
12 | ||
13 | template <typename X, typename Y, typename Z> | |
14 | struct Triple { | |
15 | X first; | |
16 | Y second; | |
17 | Z third; | |
18 | }; | |
19 | ||
20 | BOOST_HANA_CONSTEXPR_LAMBDA auto triple = [](auto x, auto y, auto z) { | |
21 | return Triple<decltype(x), decltype(y), decltype(z)>{x, y, z}; | |
22 | }; | |
23 | ||
24 | namespace boost { namespace hana { | |
25 | template <typename X, typename Y, typename Z> | |
26 | struct to_impl<tuple_tag, Triple<X, Y, Z>> { | |
27 | static constexpr auto apply(Triple<X, Y, Z> xs) { | |
28 | return make_tuple(xs.first, xs.second, xs.third); | |
29 | } | |
30 | }; | |
31 | }} | |
32 | ||
33 | int main() { | |
34 | BOOST_HANA_CONSTEXPR_CHECK( | |
35 | hana::to<hana::tuple_tag>(triple(1, '2', 3.3)) == hana::make_tuple(1, '2', 3.3) | |
36 | ); | |
37 | } |