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b32b8144 | 1 | // Copyright Louis Dionne 2013-2017 |
7c673cae FG |
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/chain.hpp> | |
7 | #include <boost/hana/equal.hpp> | |
8 | #include <boost/hana/optional.hpp> | |
9 | ||
10 | #include <laws/base.hpp> | |
11 | #include <support/tracked.hpp> | |
12 | namespace hana = boost::hana; | |
13 | using hana::test::ct_eq; | |
14 | ||
15 | ||
16 | struct undefined { }; | |
17 | ||
18 | int main() { | |
19 | hana::test::_injection<0> f{}; | |
20 | ||
21 | BOOST_HANA_CONSTANT_CHECK(hana::equal( | |
22 | hana::sfinae(f)(), | |
23 | hana::just(f()) | |
24 | )); | |
25 | ||
26 | BOOST_HANA_CONSTANT_CHECK(hana::equal( | |
27 | hana::sfinae(f)(ct_eq<0>{}), | |
28 | hana::just(f(ct_eq<0>{})) | |
29 | )); | |
30 | ||
31 | BOOST_HANA_CONSTANT_CHECK(hana::equal( | |
32 | hana::sfinae(f)(ct_eq<0>{}, ct_eq<1>{}), | |
33 | hana::just(f(ct_eq<0>{}, ct_eq<1>{})) | |
34 | )); | |
35 | ||
36 | BOOST_HANA_CONSTANT_CHECK(hana::equal( | |
37 | hana::sfinae(undefined{})(), | |
38 | hana::nothing | |
39 | )); | |
40 | ||
41 | BOOST_HANA_CONSTANT_CHECK(hana::equal( | |
42 | hana::sfinae(undefined{})(ct_eq<0>{}), | |
43 | hana::nothing | |
44 | )); | |
45 | ||
46 | BOOST_HANA_CONSTANT_CHECK(hana::equal( | |
47 | hana::sfinae(undefined{})(ct_eq<0>{}, ct_eq<1>{}), | |
48 | hana::nothing | |
49 | )); | |
50 | ||
51 | auto incr = hana::sfinae([](auto x) -> decltype(x + 1) { | |
52 | return x + 1; | |
53 | }); | |
54 | ||
55 | BOOST_HANA_RUNTIME_CHECK(hana::equal( | |
56 | incr(1), | |
57 | hana::just(2) | |
58 | )); | |
59 | BOOST_HANA_CONSTANT_CHECK(hana::equal( | |
60 | incr(undefined{}), | |
61 | hana::nothing | |
62 | )); | |
63 | BOOST_HANA_RUNTIME_CHECK(hana::equal( | |
64 | hana::chain(hana::just(1), incr), | |
65 | hana::just(2) | |
66 | )); | |
67 | ||
68 | // using `sfinae` with a non-pod argument used to fail | |
69 | hana::sfinae(undefined{})(Tracked{1}); | |
70 | hana::sfinae([t = Tracked{1}](auto) { return 1; })(Tracked{1}); | |
71 | } |