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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/detail/first_unsatisfied_index.hpp> | |
6 | ||
7 | #include <boost/hana/not_equal.hpp> | |
8 | #include <laws/base.hpp> | |
9 | ||
10 | #include <type_traits> | |
11 | namespace hana = boost::hana; | |
12 | using hana::test::ct_eq; | |
13 | ||
14 | ||
15 | struct poison { | |
16 | poison() = default; | |
17 | poison(poison const&) = delete; | |
18 | }; | |
19 | ||
20 | int main() { | |
21 | auto predicate = [](auto x) { | |
22 | static_assert(!std::is_same<poison, decltype(x)>::value, ""); | |
23 | return hana::not_equal(x, ct_eq<9>{}); | |
24 | }; | |
25 | ||
26 | using Find = hana::detail::first_unsatisfied_index<decltype(predicate)>; | |
27 | ||
28 | static_assert(decltype(Find{}())::value == 0, ""); | |
29 | ||
30 | static_assert(decltype(Find{}(ct_eq<9>{}))::value == 0, ""); | |
31 | static_assert(decltype(Find{}(ct_eq<0>{}))::value == 1, ""); | |
32 | ||
33 | static_assert(decltype(Find{}(ct_eq<9>{}, poison{}))::value == 0, ""); | |
34 | static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<9>{}))::value == 1, ""); | |
35 | static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<1>{}))::value == 2, ""); | |
36 | ||
37 | static_assert(decltype(Find{}(ct_eq<9>{}, poison{}, poison{}))::value == 0, ""); | |
38 | static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<9>{}, poison{}))::value == 1, ""); | |
39 | static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<1>{}, ct_eq<9>{}))::value == 2, ""); | |
40 | static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}))::value == 3, ""); | |
41 | ||
42 | static_assert(decltype(Find{}(ct_eq<9>{}, poison{}, poison{}, poison{}))::value == 0, ""); | |
43 | static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<9>{}, poison{}, poison{}))::value == 1, ""); | |
44 | static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<1>{}, ct_eq<9>{}, poison{}))::value == 2, ""); | |
45 | static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}, ct_eq<9>{}))::value == 3, ""); | |
46 | static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}))::value == 4, ""); | |
47 | } |