| 1 | // Copyright Louis Dionne 2013-2022 |
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| 2 | // Distributed under the Boost Software License, Version 1.0. |
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| 3 | // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) |
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| 4 | |
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| 5 | #include <boost/hana/assert.hpp> |
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| 6 | #include <boost/hana/equal.hpp> |
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| 7 | #include <boost/hana/find_if.hpp> |
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| 8 | #include <boost/hana/optional.hpp> |
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| 9 | |
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| 10 | #include <laws/base.hpp> |
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| 11 | namespace hana = boost::hana; |
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| 12 | using hana::test::ct_eq; |
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| 13 | |
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| 14 | |
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| 15 | int main() { |
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| 16 | ct_eq<2> x{}; |
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| 17 | ct_eq<3> y{}; |
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| 18 | |
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| 19 | BOOST_HANA_CONSTANT_CHECK(hana::equal( |
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| 20 | hana::find_if(hana::just(x), hana::equal.to(x)), |
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| 21 | hana::just(x) |
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| 22 | )); |
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| 23 | BOOST_HANA_CONSTANT_CHECK(hana::equal( |
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| 24 | hana::find_if(hana::just(x), hana::equal.to(y)), |
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| 25 | hana::nothing |
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| 26 | )); |
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| 27 | BOOST_HANA_CONSTANT_CHECK(hana::equal( |
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| 28 | hana::find_if(hana::nothing, hana::equal.to(x)), |
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| 29 | hana::nothing |
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| 30 | )); |
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| 31 | |
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| 32 | // Previously, there was a bug that would make this fail. |
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| 33 | auto non_const_nothing = hana::nothing; |
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| 34 | BOOST_HANA_CONSTANT_CHECK(hana::equal( |
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| 35 | hana::find_if(non_const_nothing, hana::equal.to(x)), |
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| 36 | hana::nothing |
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| 37 | )); |
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| 38 | } |
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| 39 | |
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