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1 // Copyright Louis Dionne 2013-2016
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)
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
;
15 constexpr auto xs
= hana::make_tuple(hana::int_c
<1>, hana::int_c
<2>, hana::int_c
<3>, hana::int_c
<4>);
17 BOOST_HANA_CONSTANT_CHECK(
18 hana::span(xs
, hana::less
.than(hana::int_c
<3>))
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>))
24 BOOST_HANA_CONSTANT_CHECK(
25 hana::span(xs
, hana::less
.than(hana::int_c
<0>))
27 hana::make_pair(hana::make_tuple(), xs
)
30 BOOST_HANA_CONSTANT_CHECK(
31 hana::span(xs
, hana::less
.than(hana::int_c
<5>))
33 hana::make_pair(xs
, hana::make_tuple())
36 // span.by is syntactic sugar
37 BOOST_HANA_CONSTANT_CHECK(
38 hana::span
.by(hana::less
.than(hana::int_c
<3>), xs
)
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>))