1// Copyright Louis Dionne 2013-2022
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/functional/demux.hpp>
8
9#include <laws/base.hpp>
10namespace hana = boost::hana;
11using hana::test::ct_eq;
12
13
14struct MoveOnly {
15 MoveOnly() = default;
16 MoveOnly(MoveOnly const&) = delete;
17 MoveOnly(MoveOnly&&) = default;
18};
19
20int main() {
21 hana::test::_injection<0> f{};
22 hana::test::_injection<1> g{};
23 hana::test::_injection<2> h{};
24
25 BOOST_HANA_CONSTANT_CHECK(hana::equal(
26 hana::demux(f)()(),
27 f()
28 ));
29
30 BOOST_HANA_CONSTANT_CHECK(hana::equal(
31 hana::demux(f)(g)(ct_eq<1>{}),
32 f(g(ct_eq<1>{}))
33 ));
34 BOOST_HANA_CONSTANT_CHECK(hana::equal(
35 hana::demux(f)(g)(ct_eq<1>{}, ct_eq<2>{}),
36 f(g(ct_eq<1>{}, ct_eq<2>{}))
37 ));
38 BOOST_HANA_CONSTANT_CHECK(hana::equal(
39 hana::demux(f)(g)(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}),
40 f(g(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}))
41 ));
42
43 BOOST_HANA_CONSTANT_CHECK(hana::equal(
44 hana::demux(f)(g, h)(ct_eq<1>{}),
45 f(g(ct_eq<1>{}), h(ct_eq<1>{}))
46 ));
47 BOOST_HANA_CONSTANT_CHECK(hana::equal(
48 hana::demux(f)(g, h)(ct_eq<1>{}, ct_eq<2>{}),
49 f(g(ct_eq<1>{}, ct_eq<2>{}), h(ct_eq<1>{}, ct_eq<2>{}))
50 ));
51 BOOST_HANA_CONSTANT_CHECK(hana::equal(
52 hana::demux(f)(g, h)(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}),
53 f(g(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}), h(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}))
54 ));
55
56 // Make sure we can pass move-only types when a single function
57 // is demux'ed. In other words, make sure the arguments are
58 // perfect-forwarded when a single function is demux'ed.
59 {
60 hana::demux(f)(g)(MoveOnly{});
61 hana::demux(f)(g)(MoveOnly{}, MoveOnly{});
62 hana::demux(f)(g)(MoveOnly{}, MoveOnly{}, MoveOnly{});
63 }
64}
65

source code of boost/libs/hana/test/functional/demux.cpp