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- // Copyright Louis Dionne 2013-2017
- // Distributed under the Boost Software License, Version 1.0.
- // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
- #include <boost/hana/equal.hpp>
- #include <boost/hana/ext/std/tuple.hpp>
- #include <boost/hana/mult.hpp>
- #include <boost/hana/transform.hpp>
- #include <boost/hana/tuple.hpp>
- #include <boost/hana/type.hpp>
- #include <boost/hana/unpack.hpp>
- #include <boost/hana/zip_with.hpp>
- #include <tuple>
- #include <type_traits>
- #include <utility>
- namespace hana = boost::hana;
- // Basic usage:
- static_assert(
- hana::zip_with(hana::mult, hana::make_tuple(1, 2, 3, 4), hana::make_tuple(5, 6, 7, 8))
- ==
- hana::make_tuple(5, 12, 21, 32)
- , "");
- // Example of computing a tuple of all the common types of several tuples:
- template<typename... Ts>
- using common_tuple_t = typename decltype(
- hana::unpack(
- hana::zip_with(
- hana::metafunction<std::common_type>,
- hana::transform(std::declval<Ts>(), hana::decltype_)...
- ),
- hana::template_<std::tuple>
- )
- )::type;
- static_assert(std::is_same<
- common_tuple_t<
- std::tuple<bool, int, unsigned>,
- std::tuple<char, long, long>,
- std::tuple<int, long long, double>
- >,
- std::tuple<int, long long, double>
- >::value, "");
- int main() { }
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