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 #ifndef BOOST_HANA_TEST_AUTO_AT_HPP
6 #define BOOST_HANA_TEST_AUTO_AT_HPP
7
8 #include <boost/hana/assert.hpp>
9 #include <boost/hana/at.hpp>
10 #include <boost/hana/equal.hpp>
11 #include <boost/hana/integral_constant.hpp>
12
13 #include "test_case.hpp"
14 #include <laws/base.hpp>
15 #include <support/tracked.hpp>
16
17
18 namespace _test_at_detail { template <int> struct invalid { }; }
19
20
__anonc2908f110102null21 TestCase test_at{[]{
22 namespace hana = boost::hana;
23 using hana::test::ct_eq;
24 using _test_at_detail::invalid;
25
26 BOOST_HANA_CONSTANT_CHECK(hana::equal(
27 hana::at(MAKE_TUPLE(ct_eq<0>{}), hana::size_c<0>),
28 ct_eq<0>{}
29 ));
30 BOOST_HANA_CONSTANT_CHECK(hana::equal(
31 hana::at(MAKE_TUPLE(ct_eq<0>{}, invalid<1>{}), hana::size_c<0>),
32 ct_eq<0>{}
33 ));
34
35 BOOST_HANA_CONSTANT_CHECK(hana::equal(
36 hana::at(MAKE_TUPLE(invalid<0>{}, ct_eq<1>{}), hana::size_c<1>),
37 ct_eq<1>{}
38 ));
39 BOOST_HANA_CONSTANT_CHECK(hana::equal(
40 hana::at(MAKE_TUPLE(invalid<0>{}, ct_eq<1>{}, invalid<2>{}), hana::size_c<1>),
41 ct_eq<1>{}
42 ));
43
44 BOOST_HANA_CONSTANT_CHECK(hana::equal(
45 hana::at(MAKE_TUPLE(invalid<0>{}, invalid<1>{}, ct_eq<2>{}), hana::size_c<2>),
46 ct_eq<2>{}
47 ));
48 BOOST_HANA_CONSTANT_CHECK(hana::equal(
49 hana::at(MAKE_TUPLE(invalid<0>{}, invalid<1>{}, ct_eq<2>{}, invalid<3>{}), hana::size_c<2>),
50 ct_eq<2>{}
51 ));
52
53 #ifndef MAKE_TUPLE_NO_CONSTEXPR
54 static_assert(hana::equal(
55 hana::at(MAKE_TUPLE(1), hana::size_c<0>),
56 1
57 ), "");
58 static_assert(hana::equal(
59 hana::at(MAKE_TUPLE(1, '2'), hana::size_c<0>),
60 1
61 ), "");
62 static_assert(hana::equal(
63 hana::at(MAKE_TUPLE(1, '2', 3.3), hana::size_c<0>),
64 1
65 ), "");
66
67 static_assert(hana::equal(
68 hana::at(MAKE_TUPLE(1, '2'), hana::size_c<1>),
69 '2'
70 ), "");
71 static_assert(hana::equal(
72 hana::at(MAKE_TUPLE(1, '2', 3.3), hana::size_c<1>),
73 '2'
74 ), "");
75
76 static_assert(hana::equal(
77 hana::at(MAKE_TUPLE(1, '2', 3.3), hana::size_c<2>),
78 3.3
79 ), "");
80 #endif
81
82 // make sure we can use non-pods on both sides
83 {
84 // store the result to make sure `at` is executed.
85 auto result = hana::at(MAKE_TUPLE(Tracked{0}, ct_eq<1>{}, Tracked{1}), hana::size_c<1>);;
86 BOOST_HANA_CONSTANT_CHECK(hana::equal(result, ct_eq<1>{}));
87 }
88
89 }};
90
91 #endif // !BOOST_HANA_TEST_AUTO_AT_HPP
92