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/intersection.hpp>
8#include <boost/hana/map.hpp>
9#include <boost/hana/string.hpp>
10
11#include <string>
12namespace hana = boost::hana;
13using namespace hana::literals;
14
15
16static auto m1 = hana::make_map(
17 hana::make_pair(BOOST_HANA_STRING("key1"), hana::type_c<std::string>),
18 hana::make_pair(BOOST_HANA_STRING("key2"), hana::type_c<std::string>)
19);
20
21static auto m2 = hana::make_map(
22 hana::make_pair(BOOST_HANA_STRING("key3"), hana::type_c<std::string>),
23 hana::make_pair(BOOST_HANA_STRING("key4"), hana::type_c<std::string>),
24 hana::make_pair(BOOST_HANA_STRING("key5"), hana::type_c<std::string>)
25);
26
27BOOST_HANA_CONSTANT_CHECK(hana::intersection(m1, m2) == hana::make_map());
28
29static auto m3 = hana::make_map(
30 hana::make_pair(hana::type_c<int>, hana::int_c<1>),
31 hana::make_pair(hana::type_c<bool>, hana::bool_c<true>),
32 hana::make_pair(hana::type_c<std::string>, BOOST_HANA_STRING("hana")),
33 hana::make_pair(hana::type_c<float>, hana::int_c<100>)
34);
35
36static auto m4 = hana::make_map(
37 hana::make_pair(hana::type_c<char>, hana::char_c<'c'>),
38 hana::make_pair(hana::type_c<bool>, hana::bool_c<false>),
39 hana::make_pair(hana::type_c<std::string>, BOOST_HANA_STRING("boost"))
40);
41
42BOOST_HANA_CONSTANT_CHECK(hana::intersection(m3, m4) == hana::make_map(
43 hana::make_pair(hana::type_c<bool>, hana::bool_c<true>),
44 hana::make_pair(hana::type_c<std::string>, BOOST_HANA_STRING("hana"))
45));
46
47int main() { }
48

source code of boost/libs/hana/example/map/intersection.cpp