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- // Copyright Louis Dionne 2013-2017
- // Distributed under the Boost Software License, Version 1.0.
- // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
- #include <boost/hana/assert.hpp>
- #include <boost/hana/contains.hpp>
- #include <boost/hana/permutations.hpp>
- #include <boost/hana/set.hpp>
- #include <boost/hana/transform.hpp>
- #include <boost/hana/tuple.hpp>
- #include <boost/hana/unpack.hpp>
- #include <laws/base.hpp>
- namespace hana = boost::hana;
- using hana::test::ct_eq;
- int main() {
- hana::test::_injection<0> f{};
- auto check = [=](auto ...xs) {
- auto arg_perms = hana::permutations(hana::make_tuple(xs...));
- auto possible_results = hana::transform(arg_perms, [=](auto args) {
- return hana::unpack(args, f);
- });
- BOOST_HANA_CONSTANT_CHECK(hana::contains(
- possible_results,
- hana::unpack(hana::make_set(xs...), f)
- ));
- };
- check();
- check(ct_eq<1>{});
- check(ct_eq<1>{}, ct_eq<2>{});
- check(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{});
- check(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}, ct_eq<4>{});
- }
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