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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/experimental/view.hpp>
- #include <boost/hana/is_empty.hpp>
- #include <boost/hana/not.hpp>
- #include <support/seq.hpp>
- namespace hana = boost::hana;
- template <int> struct undefined { };
- int main() {
- auto container = ::seq;
- {
- auto storage1 = container();
- auto storage2 = container();
- auto joined = hana::experimental::joined(storage1, storage2);
- BOOST_HANA_CONSTANT_CHECK(hana::is_empty(joined));
- }
- {
- auto storage1 = container(undefined<0>{});
- auto storage2 = container();
- auto joined = hana::experimental::joined(storage1, storage2);
- BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(joined)));
- }
- {
- auto storage1 = container(undefined<0>{});
- auto storage2 = container(undefined<1>{});
- auto joined = hana::experimental::joined(storage1, storage2);
- BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(joined)));
- }
- {
- auto storage1 = container();
- auto storage2 = container(undefined<0>{});
- auto joined = hana::experimental::joined(storage1, storage2);
- BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(joined)));
- }
- }
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