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/difference.hpp>
7 #include <boost/hana/equal.hpp>
8 #include <boost/hana/map.hpp>
9 #include <boost/hana/string.hpp>
10
11 #include <string>
12 namespace hana = boost::hana;
13
14
15 static auto m1 = hana::make_map(
16 hana::make_pair(BOOST_HANA_STRING("key1"), hana::type_c<std::string>),
17 hana::make_pair(BOOST_HANA_STRING("key2"), hana::type_c<std::string>)
18 );
19
20 static auto m2 = hana::make_map(
21 hana::make_pair(BOOST_HANA_STRING("key3"), hana::type_c<std::string>),
22 hana::make_pair(BOOST_HANA_STRING("key4"), hana::type_c<std::string>),
23 hana::make_pair(BOOST_HANA_STRING("key5"), hana::type_c<std::string>)
24 );
25
26 static auto m3 = hana::make_map(
27 hana::make_pair(BOOST_HANA_STRING("key1"), hana::type_c<std::string>),
28 hana::make_pair(BOOST_HANA_STRING("key4"), hana::type_c<int>),
29 hana::make_pair(BOOST_HANA_STRING("key2"), hana::type_c<long long>)
30 );
31
main()32 int main() {
33 BOOST_HANA_CONSTANT_CHECK(hana::difference(m1, m2) == m1);
34
35 BOOST_HANA_CONSTANT_CHECK(hana::difference(m1, m3) == hana::make_map());
36
37 BOOST_HANA_CONSTANT_CHECK(hana::difference(m3, m1) == hana::make_map(
38 hana::make_pair(BOOST_HANA_STRING("key4"), hana::type_c<int>)
39 ));
40
41 BOOST_HANA_CONSTANT_CHECK(hana::difference(m2, m3) == hana::make_map(
42 hana::make_pair(BOOST_HANA_STRING("key3"), hana::type_c<std::string>),
43 hana::make_pair(BOOST_HANA_STRING("key5"), hana::type_c<std::string>)
44 ));
45 }
46