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/contains.hpp>
7#include <boost/hana/core/to.hpp>
8#include <boost/hana/equal.hpp>
9#include <boost/hana/map.hpp>
10#include <boost/hana/permutations.hpp>
11
12#include <laws/base.hpp>
13#include <support/minimal_product.hpp>
14#include <support/seq.hpp>
15namespace hana = boost::hana;
16
17
18template <int i>
19auto key() { return hana::test::ct_eq<i>{}; }
20
21template <int i>
22auto val() { return hana::test::ct_eq<-i>{}; }
23
24template <int i, int j>
25auto p() { return ::minimal_product(key<i>(), val<j>()); }
26
27int main() {
28 constexpr auto foldable = ::seq;
29 auto sequence = ::seq;
30
31 // Foldable -> Map
32 {
33 BOOST_HANA_CONSTANT_CHECK(hana::equal(
34 hana::to_map(foldable()),
35 hana::make_map()
36 ));
37 BOOST_HANA_CONSTANT_CHECK(hana::equal(
38 hana::to_map(foldable(p<1, 1>())),
39 hana::make_map(p<1, 1>())
40 ));
41 BOOST_HANA_CONSTANT_CHECK(hana::equal(
42 hana::to_map(foldable(p<1, 1>(), p<2, 2>())),
43 hana::make_map(p<1, 1>(), p<2, 2>())
44 ));
45 BOOST_HANA_CONSTANT_CHECK(hana::equal(
46 hana::to_map(foldable(p<1, 1>(), p<2, 2>(), p<3, 3>())),
47 hana::make_map(p<1, 1>(), p<2, 2>(), p<3, 3>())
48 ));
49
50 // with duplicates
51 BOOST_HANA_CONSTANT_CHECK(hana::equal(
52 hana::to_map(foldable(p<1, 1>(), p<1, 99>())),
53 hana::make_map(p<1, 1>())
54 ));
55 BOOST_HANA_CONSTANT_CHECK(hana::equal(
56 hana::to_map(foldable(p<1, 1>(), p<2, 2>(), p<1, 99>())),
57 hana::make_map(p<1, 1>(), p<2, 2>())
58 ));
59 BOOST_HANA_CONSTANT_CHECK(hana::equal(
60 hana::to_map(foldable(p<1, 1>(), p<2, 2>(), p<1, 99>(), p<2, 99>())),
61 hana::make_map(p<1, 1>(), p<2, 2>())
62 ));
63 BOOST_HANA_CONSTANT_CHECK(hana::equal(
64 hana::to_map(foldable(p<1, 1>(), p<2, 2>(), p<1, 99>(), p<2, 99>(), p<3, 3>())),
65 hana::make_map(p<1, 1>(), p<2, 2>(), p<3, 3>())
66 ));
67 }
68
69 // Map -> Sequence
70 {
71 auto check = [=](auto ...xs) {
72 BOOST_HANA_CONSTANT_CHECK(hana::contains(
73 hana::permutations(sequence(xs...)),
74 hana::to<::Seq>(hana::make_map(xs...))
75 ));
76 };
77
78 check();
79 check(p<1, 1>());
80 check(p<1, 1>(), p<2, 2>());
81 check(p<1, 1>(), p<2, 2>(), p<3, 3>());
82 check(p<1, 1>(), p<2, 2>(), p<3, 3>(), p<4, 4>());
83 }
84
85 // to_map == to<map_tag>
86 {
87 BOOST_HANA_CONSTANT_CHECK(hana::equal(
88 hana::to_map(foldable(p<1, 1>(), p<2, 2>(), p<1, 99>(), p<2, 99>(), p<3, 3>())),
89 hana::to<hana::map_tag>(foldable(p<1, 1>(), p<2, 2>(), p<1, 99>(), p<2, 99>(), p<3, 3>()))
90 ));
91 }
92}
93

source code of boost/libs/hana/test/map/to.cpp