1234567891011121314151617181920212223242526272829303132333435363738394041424344454647 |
- // Copyright 2015-2018 Hans Dembinski
- //
- // Distributed under the Boost Software License, Version 1.0.
- // (See accompanying file LICENSE_1_0.txt
- // or copy at http://www.boost.org/LICENSE_1_0.txt)
- #ifndef BOOST_HISTOGRAM_DETAIL_COMMON_TYPE_HPP
- #define BOOST_HISTOGRAM_DETAIL_COMMON_TYPE_HPP
- #include <boost/histogram/detail/detect.hpp>
- #include <boost/histogram/fwd.hpp>
- #include <boost/mp11/list.hpp>
- #include <boost/mp11/utility.hpp>
- #include <tuple>
- #include <type_traits>
- namespace boost {
- namespace histogram {
- namespace detail {
- // clang-format off
- template <class T, class U>
- using common_axes = mp11::mp_cond<
- is_tuple<T>, T,
- is_tuple<U>, U,
- is_sequence_of_axis<T>, T,
- is_sequence_of_axis<U>, U,
- std::true_type, T
- >;
- // clang-format on
- // Non-PODs rank highest, then floats, than integers; types with more capacity are higher
- template <class Storage>
- static constexpr std::size_t type_rank() {
- using T = typename Storage::value_type;
- return !std::is_pod<T>::value * 10000 + std::is_floating_point<T>::value * 100 +
- 10 * sizeof(T) + 2 * is_array_like<Storage>::value +
- is_vector_like<Storage>::value;
- ;
- }
- template <class T, class U>
- using common_storage = mp11::mp_if_c<(type_rank<T>() >= type_rank<U>()), T, U>;
- } // namespace detail
- } // namespace histogram
- } // namespace boost
- #endif
|