1 // Copyright Louis Dionne 2013-2017
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/experimental/view.hpp>
7 #include <boost/hana/is_empty.hpp>
8 #include <boost/hana/not.hpp>
9 #include <boost/hana/tuple.hpp>
10
11 #include <support/seq.hpp>
12 namespace hana = boost::hana;
13
14
15 template <int> struct undefined { };
16
main()17 int main() {
18 auto container = ::seq;
19
20 {
21 auto storage = container();
22 auto sliced = hana::experimental::sliced(storage, hana::tuple_c<int>);
23 BOOST_HANA_CONSTANT_CHECK(hana::is_empty(sliced));
24 }{
25 auto storage = container(undefined<0>{});
26 auto sliced = hana::experimental::sliced(storage, hana::tuple_c<int>);
27 BOOST_HANA_CONSTANT_CHECK(hana::is_empty(sliced));
28 }{
29 auto storage = container(undefined<0>{}, undefined<1>{});
30 auto sliced = hana::experimental::sliced(storage, hana::tuple_c<int>);
31 BOOST_HANA_CONSTANT_CHECK(hana::is_empty(sliced));
32 }
33
34 {
35 auto storage = container(undefined<0>{});
36 auto sliced = hana::experimental::sliced(storage, hana::tuple_c<int, 0>);
37 BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(sliced)));
38 }{
39 auto storage = container(undefined<0>{});
40 auto sliced = hana::experimental::sliced(storage, hana::tuple_c<int, 0, 0>);
41 BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(sliced)));
42 }
43
44 {
45 auto storage = container(undefined<0>{}, undefined<1>{});
46 auto sliced = hana::experimental::sliced(storage, hana::tuple_c<int, 0, 1>);
47 BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(sliced)));
48 }
49 }
50