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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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