| 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/equal.hpp> |
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| 6 | #include <boost/hana/ext/std/tuple.hpp> |
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| 7 | #include <boost/hana/mult.hpp> |
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| 8 | #include <boost/hana/transform.hpp> |
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| 9 | #include <boost/hana/tuple.hpp> |
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| 10 | #include <boost/hana/type.hpp> |
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| 11 | #include <boost/hana/unpack.hpp> |
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| 12 | #include <boost/hana/zip_with.hpp> |
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| 13 | |
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| 14 | #include <tuple> |
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| 15 | #include <type_traits> |
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| 16 | #include <utility> |
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| 17 | namespace hana = boost::hana; |
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| 18 | |
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| 19 | |
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| 20 | // Basic usage: |
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| 21 | static_assert( |
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| 22 | hana::zip_with(hana::mult, hana::make_tuple(1, 2, 3, 4), hana::make_tuple(5, 6, 7, 8)) |
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| 23 | == |
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| 24 | hana::make_tuple(5, 12, 21, 32) |
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| 25 | , "" ); |
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| 26 | |
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| 27 | |
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| 28 | |
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| 29 | // Example of computing a tuple of all the common types of several tuples: |
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| 30 | template<typename... Ts> |
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| 31 | using common_tuple_t = typename decltype( |
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| 32 | hana::unpack( |
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| 33 | hana::zip_with( |
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| 34 | hana::metafunction<std::common_type>, |
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| 35 | hana::transform(std::declval<Ts>(), hana::decltype_)... |
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| 36 | ), |
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| 37 | hana::template_<std::tuple> |
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| 38 | ) |
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| 39 | )::type; |
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| 40 | |
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| 41 | |
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| 42 | static_assert(std::is_same< |
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| 43 | common_tuple_t< |
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| 44 | std::tuple<bool, int, unsigned>, |
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| 45 | std::tuple<char, long, long>, |
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| 46 | std::tuple<int, long long, double> |
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| 47 | >, |
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| 48 | std::tuple<int, long long, double> |
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| 49 | >::value, "" ); |
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| 50 | |
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| 51 | int main() { } |
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| 52 | |
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