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/erase_key.hpp>
8#include <boost/hana/map.hpp>
9
10#include <laws/base.hpp>
11#include <support/minimal_product.hpp>
12namespace hana = boost::hana;
13
14
15template <int i>
16auto key() { return hana::test::ct_eq<i>{}; }
17
18template <int i>
19auto val() { return hana::test::ct_eq<-i>{}; }
20
21template <int i, int j>
22auto p() { return ::minimal_product(key<i>(), val<j>()); }
23
24struct undefined { };
25
26int main() {
27 BOOST_HANA_CONSTANT_CHECK(hana::equal(
28 hana::erase_key(hana::make_map(), undefined{}),
29 hana::make_map()
30 ));
31
32 BOOST_HANA_CONSTANT_CHECK(hana::equal(
33 hana::erase_key(hana::make_map(p<1, 1>()), key<1>()),
34 hana::make_map()
35 ));
36 BOOST_HANA_CONSTANT_CHECK(hana::equal(
37 hana::erase_key(hana::make_map(p<1, 1>()), key<99>()),
38 hana::make_map(p<1, 1>())
39 ));
40
41 BOOST_HANA_CONSTANT_CHECK(hana::equal(
42 hana::erase_key(hana::make_map(p<1, 1>(), p<2, 2>()), key<99>()),
43 hana::make_map(p<1, 1>(), p<2, 2>())
44 ));
45 BOOST_HANA_CONSTANT_CHECK(hana::equal(
46 hana::erase_key(hana::make_map(p<1, 1>(), p<2, 2>()), key<1>()),
47 hana::make_map(p<2, 2>())
48 ));
49 BOOST_HANA_CONSTANT_CHECK(hana::equal(
50 hana::erase_key(hana::make_map(p<1, 1>(), p<2, 2>()), key<2>()),
51 hana::make_map(p<1, 1>())
52 ));
53
54 BOOST_HANA_CONSTANT_CHECK(hana::equal(
55 hana::erase_key(hana::make_map(p<1, 1>(), p<2, 2>(), p<3, 3>()), key<99>()),
56 hana::make_map(p<1, 1>(), p<2, 2>(), p<3, 3>())
57 ));
58 BOOST_HANA_CONSTANT_CHECK(hana::equal(
59 hana::erase_key(hana::make_map(p<1, 1>(), p<2, 2>(), p<3, 3>()), key<1>()),
60 hana::make_map(p<2, 2>(), p<3, 3>())
61 ));
62 BOOST_HANA_CONSTANT_CHECK(hana::equal(
63 hana::erase_key(hana::make_map(p<1, 1>(), p<2, 2>(), p<3, 3>()), key<2>()),
64 hana::make_map(p<1, 1>(), p<3, 3>())
65 ));
66 BOOST_HANA_CONSTANT_CHECK(hana::equal(
67 hana::erase_key(hana::make_map(p<1, 1>(), p<2, 2>(), p<3, 3>()), key<3>()),
68 hana::make_map(p<1, 1>(), p<2, 2>())
69 ));
70}
71

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