1// Copyright Louis Dionne 2013-2022
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/ext/std/array.hpp>
6
7#include <boost/hana/assert.hpp>
8#include <boost/hana/drop_front_exactly.hpp>
9#include <boost/hana/equal.hpp>
10#include <boost/hana/front.hpp>
11#include <boost/hana/integral_constant.hpp>
12#include <boost/hana/is_empty.hpp>
13#include <boost/hana/not.hpp>
14#include <boost/hana/tuple.hpp>
15
16#include <laws/base.hpp>
17#include <laws/iterable.hpp>
18
19#include <array>
20namespace hana = boost::hana;
21
22
23template <int ...i>
24constexpr auto array() { return std::array<int, sizeof...(i)>{{i...}}; }
25
26int main() {
27 // is_empty
28 {
29 BOOST_HANA_CONSTANT_CHECK(hana::is_empty(array<>()));
30 BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(array<0>())));
31 BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(array<0, 1>())));
32 }
33
34 // front
35 {
36 BOOST_HANA_CONSTEXPR_CHECK(hana::front(array<0>()) == 0);
37 BOOST_HANA_CONSTEXPR_CHECK(hana::front(array<0, 1>()) == 0);
38 BOOST_HANA_CONSTEXPR_CHECK(hana::front(array<0, 1, 2>()) == 0);
39 }
40
41 // drop_front_exactly
42 {
43 BOOST_HANA_CONSTANT_CHECK(hana::equal(
44 hana::drop_front_exactly(array<0>()),
45 array<>()
46 ));
47 BOOST_HANA_CONSTEXPR_CHECK(hana::equal(
48 hana::drop_front_exactly(array<0, 1>()),
49 array<1>()
50 ));
51 BOOST_HANA_CONSTEXPR_CHECK(hana::equal(
52 hana::drop_front_exactly(array<0, 1, 2>()),
53 array<1, 2>()
54 ));
55 BOOST_HANA_CONSTEXPR_CHECK(hana::equal(
56 hana::drop_front_exactly(array<0, 1, 2, 3>()),
57 array<1, 2, 3>()
58 ));
59
60
61 BOOST_HANA_CONSTEXPR_CHECK(hana::equal(
62 hana::drop_front_exactly(array<0, 1, 2, 3>(), hana::size_c<2>),
63 array<2, 3>()
64 ));
65
66 BOOST_HANA_CONSTEXPR_CHECK(hana::equal(
67 hana::drop_front_exactly(array<0, 1, 2, 3>(), hana::size_c<3>),
68 array<3>()
69 ));
70 }
71
72 // laws
73 auto int_arrays = hana::make_tuple(
74 array<>()
75 , array<0>()
76 , array<0, 1>()
77 , array<0, 1, 2>()
78 , array<0, 1, 2, 3>()
79 , array<0, 1, 2, 3, 4>()
80 );
81
82 hana::test::TestIterable<hana::ext::std::array_tag>{int_arrays};
83}
84

source code of boost/libs/hana/test/ext/std/array/iterable.cpp