Imported Upstream version 1.64.0
[platform/upstream/boost.git] / libs / hana / example / permutations.cpp
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/all_of.hpp>
6 #include <boost/hana/assert.hpp>
7 #include <boost/hana/config.hpp>
8 #include <boost/hana/contains.hpp>
9 #include <boost/hana/functional/curry.hpp>
10 #include <boost/hana/permutations.hpp>
11 #include <boost/hana/tuple.hpp>
12 namespace hana = boost::hana;
13
14
15 BOOST_HANA_CONSTEXPR_LAMBDA auto is_permutation_of = hana::curry<2>([](auto xs, auto perm) {
16     return hana::contains(hana::permutations(xs), perm);
17 });
18
19 int main() {
20     BOOST_HANA_CONSTEXPR_CHECK(
21         hana::all_of(
22             hana::make_tuple(
23                 hana::make_tuple('1', 2, 3.0),
24                 hana::make_tuple('1', 3.0, 2),
25                 hana::make_tuple(2, '1', 3.0),
26                 hana::make_tuple(2, 3.0, '1'),
27                 hana::make_tuple(3.0, '1', 2),
28                 hana::make_tuple(3.0, 2, '1')
29             ),
30             is_permutation_of(hana::make_tuple('1', 2, 3.0))
31         )
32     );
33 }