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/equal.hpp>
7 #include <boost/hana/integral_constant.hpp>
8 #include <boost/hana/less.hpp>
9 #include <boost/hana/pair.hpp>
10 #include <boost/hana/span.hpp>
11 #include <boost/hana/tuple.hpp>
12 namespace hana = boost::hana;
13
14
15 constexpr auto xs = hana::make_tuple(hana::int_c<1>, hana::int_c<2>, hana::int_c<3>, hana::int_c<4>);
16
17 BOOST_HANA_CONSTANT_CHECK(
18 hana::span(xs, hana::less.than(hana::int_c<3>))
19 ==
20 hana::make_pair(hana::make_tuple(hana::int_c<1>, hana::int_c<2>),
21 hana::make_tuple(hana::int_c<3>, hana::int_c<4>))
22 );
23
24 BOOST_HANA_CONSTANT_CHECK(
25 hana::span(xs, hana::less.than(hana::int_c<0>))
26 ==
27 hana::make_pair(hana::make_tuple(), xs)
28 );
29
30 BOOST_HANA_CONSTANT_CHECK(
31 hana::span(xs, hana::less.than(hana::int_c<5>))
32 ==
33 hana::make_pair(xs, hana::make_tuple())
34 );
35
36 // span.by is syntactic sugar
37 BOOST_HANA_CONSTANT_CHECK(
38 hana::span.by(hana::less.than(hana::int_c<3>), xs)
39 ==
40 hana::make_pair(hana::make_tuple(hana::int_c<1>, hana::int_c<2>),
41 hana::make_tuple(hana::int_c<3>, hana::int_c<4>))
42 );
43
main()44 int main() { }
45