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/comparing.hpp>
7 #include <boost/hana/equal.hpp>
8 #include <boost/hana/tuple.hpp>
9 #include <boost/hana/type.hpp>
10 #include <boost/hana/unique.hpp>
11
12 #include <string>
13 namespace hana = boost::hana;
14 using namespace std::literals;
15
16
17 // unique without a predicate
18 constexpr auto types = hana::tuple_t<int, float, float, char, int, int, int, double>;
19 BOOST_HANA_CONSTANT_CHECK(
20 hana::unique(types) == hana::tuple_t<int, float, char, int, double>
21 );
22
main()23 int main() {
24 // unique with a predicate
25 auto objects = hana::make_tuple(1, 2, "abc"s, 'd', "efg"s, "hij"s, 3.4f);
26 BOOST_HANA_RUNTIME_CHECK(
27 hana::unique(objects, [](auto const& t, auto const& u) {
28 return hana::typeid_(t) == hana::typeid_(u);
29 })
30 == hana::make_tuple(1, "abc"s, 'd', "efg"s, 3.4f)
31 );
32
33 // unique.by is syntactic sugar
34 BOOST_HANA_RUNTIME_CHECK(
35 hana::unique.by(hana::comparing(hana::typeid_), objects) ==
36 hana::make_tuple(1, "abc"s, 'd', "efg"s, 3.4f)
37 );
38 }
39