| 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/chain.hpp> |
| 7 | #include <boost/hana/equal.hpp> |
| 8 | #include <boost/hana/optional.hpp> |
| 9 | |
| 10 | #include <laws/base.hpp> |
| 11 | namespace hana = boost::hana; |
| 12 | using hana::test::ct_eq; |
| 13 | |
| 14 | |
| 15 | int main() { |
| 16 | auto f = [](auto x) { |
| 17 | return hana::just(hana::test::_injection<0>{}(x)); |
| 18 | }; |
| 19 | |
| 20 | BOOST_HANA_CONSTANT_CHECK(hana::equal( |
| 21 | hana::chain(hana::just(ct_eq<3>{}), f), |
| 22 | f(ct_eq<3>{}) |
| 23 | )); |
| 24 | |
| 25 | BOOST_HANA_CONSTANT_CHECK(hana::equal( |
| 26 | hana::chain(hana::nothing, f), |
| 27 | hana::nothing |
| 28 | )); |
| 29 | |
| 30 | // test with operators |
| 31 | BOOST_HANA_CONSTANT_CHECK(hana::equal( |
| 32 | hana::just(ct_eq<3>{}) | f, |
| 33 | f(ct_eq<3>{}) |
| 34 | )); |
| 35 | |
| 36 | BOOST_HANA_CONSTANT_CHECK(hana::equal( |
| 37 | hana::nothing | f, |
| 38 | hana::nothing |
| 39 | )); |
| 40 | } |
| 41 |