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
__anon56c12a2f0102(auto x, auto y, auto z) 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>> {
applyboost::hana::to_impl27 static constexpr auto apply(Triple<X, Y, Z> xs) {
28 return make_tuple(xs.first, xs.second, xs.third);
29 }
30 };
31 }}
32
main()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 }
38