// Copyright 2015-2018 Hans Dembinski
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt
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// or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_HISTOGRAM_DETAIL_COMMON_TYPE_HPP
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#define BOOST_HISTOGRAM_DETAIL_COMMON_TYPE_HPP
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#include <boost/histogram/detail/detect.hpp>
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#include <boost/histogram/fwd.hpp>
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#include <boost/mp11/list.hpp>
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#include <boost/mp11/utility.hpp>
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#include <tuple>
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#include <type_traits>
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namespace boost {
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namespace histogram {
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namespace detail {
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// clang-format off
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template <class T, class U>
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using common_axes = mp11::mp_cond<
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is_tuple<T>, T,
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is_tuple<U>, U,
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is_sequence_of_axis<T>, T,
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is_sequence_of_axis<U>, U,
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std::true_type, T
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>;
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// clang-format on
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// Non-PODs rank highest, then floats, than integers; types with more capacity are higher
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template <class Storage>
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constexpr std::size_t type_rank() {
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using T = typename Storage::value_type;
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return !std::is_arithmetic<T>::value * 10000 + std::is_floating_point<T>::value * 100 +
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10 * sizeof(T) + 2 * is_array_like<Storage>::value +
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is_vector_like<Storage>::value;
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;
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}
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template <class T, class U>
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using common_storage = mp11::mp_if_c<(type_rank<T>() >= type_rank<U>()), T, U>;
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} // namespace detail
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} // namespace histogram
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} // namespace boost
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#endif
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