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