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/drop_front_exactly.hpp>
7 #include <boost/hana/equal.hpp>
8 #include <boost/hana/tuple.hpp>
9 namespace hana = boost::hana;
10 
11 
12 struct x0;
13 struct x1;
14 struct x2;
15 
main()16 int main() {
17     // tuple_t
18     BOOST_HANA_CONSTANT_CHECK(hana::equal(
19         hana::drop_front_exactly(hana::tuple_t<x0>),
20         hana::tuple_t<>
21     ));
22     BOOST_HANA_CONSTANT_CHECK(hana::equal(
23         hana::drop_front_exactly(hana::tuple_t<x0, x1>),
24         hana::tuple_t<x1>
25     ));
26     BOOST_HANA_CONSTANT_CHECK(hana::equal(
27         hana::drop_front_exactly(hana::tuple_t<x0, x1, x2>),
28         hana::tuple_t<x1, x2>
29     ));
30 
31     // tuple_c
32     BOOST_HANA_CONSTANT_CHECK(hana::equal(
33         hana::drop_front_exactly(hana::tuple_c<int, 0>),
34         hana::tuple_c<int>
35     ));
36 
37     BOOST_HANA_CONSTANT_CHECK(hana::equal(
38         hana::drop_front_exactly(hana::tuple_c<int, 0, 1>),
39         hana::tuple_c<int, 1>
40     ));
41 
42     BOOST_HANA_CONSTANT_CHECK(hana::equal(
43         hana::drop_front_exactly(hana::tuple_c<int, 0, 1, 2>),
44         hana::tuple_c<int, 1, 2>
45     ));
46 }
47