| 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/concat.hpp> |
| 7 | #include <boost/hana/empty.hpp> |
| 8 | #include <boost/hana/equal.hpp> |
| 9 | #include <boost/hana/optional.hpp> |
| 10 | namespace hana = boost::hana; |
| 11 | |
| 12 | |
| 13 | static_assert(hana::concat(hana::nothing, hana::just('x')) == hana::just('x'), ""); |
| 14 | BOOST_HANA_CONSTANT_CHECK(hana::concat(hana::nothing, hana::nothing) == hana::nothing); |
| 15 | static_assert(hana::concat(hana::just('x'), hana::just('y')) == hana::just('x'), ""); |
| 16 | BOOST_HANA_CONSTANT_CHECK(hana::empty<hana::optional_tag>() == hana::nothing); |
| 17 | |
| 18 | int main() { } |
| 19 |