| 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/adjust_if.hpp> |
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| 6 | #include <boost/hana/assert.hpp> |
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| 7 | #include <boost/hana/config.hpp> |
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| 8 | #include <boost/hana/equal.hpp> |
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| 9 | #include <boost/hana/tuple.hpp> |
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| 10 | namespace hana = boost::hana; |
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| 11 | |
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| 12 | |
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| 13 | BOOST_HANA_CONSTEXPR_LAMBDA auto negative = [](auto x) { |
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| 14 | return x < 0; |
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| 15 | }; |
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| 16 | |
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| 17 | BOOST_HANA_CONSTEXPR_LAMBDA auto negate = [](auto x) { |
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| 18 | return -x; |
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| 19 | }; |
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| 20 | |
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| 21 | int main() { |
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| 22 | BOOST_HANA_CONSTEXPR_CHECK( |
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| 23 | hana::adjust_if(hana::make_tuple(-3, -2, -1, 0, 1, 2, 3), negative, negate) |
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| 24 | == |
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| 25 | hana::make_tuple(3, 2, 1, 0, 1, 2, 3) |
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| 26 | ); |
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| 27 | } |
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| 28 | |
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