| 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/ap.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/optional.hpp> |
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| 10 | #include <boost/hana/tuple.hpp> |
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| 11 | |
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| 12 | #include <functional> |
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| 13 | namespace hana = boost::hana; |
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| 14 | |
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| 15 | |
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| 16 | int main() { |
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| 17 | // with tuples |
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| 18 | static_assert( |
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| 19 | hana::ap(hana::make_tuple(std::plus<>{}), hana::make_tuple(1, 2), |
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| 20 | hana::make_tuple(3, 4, 5)) |
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| 21 | == |
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| 22 | hana::make_tuple( |
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| 23 | 1 + 3, 1 + 4, 1 + 5, |
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| 24 | 2 + 3, 2 + 4, 2 + 5 |
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| 25 | ) |
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| 26 | , "" ); |
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| 27 | |
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| 28 | // with optional values |
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| 29 | BOOST_HANA_CONSTEXPR_LAMBDA auto multiply = [](auto a, auto b, auto c) { |
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| 30 | return a * b * c; |
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| 31 | }; |
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| 32 | |
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| 33 | BOOST_HANA_CONSTEXPR_CHECK( |
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| 34 | hana::ap(hana::just(multiply), hana::just(1), |
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| 35 | hana::just(2), |
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| 36 | hana::just(3)) |
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| 37 | == |
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| 38 | hana::just(1 * 2 * 3) |
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| 39 | ); |
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| 40 | |
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| 41 | BOOST_HANA_CONSTANT_CHECK( |
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| 42 | hana::ap(hana::just(multiply), hana::just(1), |
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| 43 | hana::nothing, |
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| 44 | hana::just(3)) |
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| 45 | == |
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| 46 | hana::nothing |
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| 47 | ); |
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| 48 | } |
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| 49 | |
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