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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;
- struct undefined { };
- int main() {
- auto container = ::seq;
- {
- auto xs = container();
- auto tr = hana::experimental::transformed(xs, undefined{});
- BOOST_HANA_CONSTANT_CHECK(hana::is_empty(tr));
- }
- {
- auto xs = container(undefined{});
- auto tr = hana::experimental::transformed(xs, undefined{});
- BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(tr)));
- }
- {
- auto xs = container(undefined{}, undefined{});
- auto tr = hana::experimental::transformed(xs, undefined{});
- BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(tr)));
- }
- }
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