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ENH: dtype dispatcher for Dataframe Intercahnge Protocol in Python (#…
…2696) * ENH: dtype dispatcher for Dataframe Intercahnge Protocol in Python --------- Co-authored-by: Nikita Kulikov <nikita.kulikov@intel.com>
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| /******************************************************************************* | ||
| * Copyright contributors to the oneDAL project | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| *******************************************************************************/ | ||
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| #pragma once | ||
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| #include <cstdint> | ||
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| #include "oneapi/dal/common.hpp" | ||
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| namespace oneapi::dal::detail { | ||
| namespace v1 { | ||
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| template <typename Op, typename OnUnknown> | ||
| inline constexpr auto dispatch_by_data_type(data_type dtype, Op&& op, OnUnknown&& on_unknown) { | ||
| switch (dtype) { | ||
| case data_type::int8: return op(std::int8_t{}); | ||
| case data_type::uint8: return op(std::uint8_t{}); | ||
| case data_type::int16: return op(std::int16_t{}); | ||
| case data_type::uint16: return op(std::uint16_t{}); | ||
| case data_type::int32: return op(std::int32_t{}); | ||
| case data_type::uint32: return op(std::uint32_t{}); | ||
| case data_type::int64: return op(std::int64_t{}); | ||
| case data_type::uint64: return op(std::uint64_t{}); | ||
| case data_type::float32: return op(float{}); | ||
| case data_type::float64: return op(double{}); | ||
| default: return on_unknown(dtype); | ||
| } | ||
| } | ||
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| template <typename Op, typename ResultType = std::invoke_result_t<Op, float>> | ||
| inline constexpr ResultType dispatch_by_data_type(data_type dtype, Op&& op) { | ||
| // Necessary to make the return type conformant with | ||
| // other dispatch branches | ||
| const auto on_unknown = [](data_type) -> ResultType { | ||
| using msg = dal::detail::error_messages; | ||
| throw unimplemented{ msg::unsupported_conversion_types() }; | ||
| }; | ||
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| return dispatch_by_data_type(dtype, std::forward<Op>(op), on_unknown); | ||
| } | ||
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| namespace impl { | ||
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| template <typename Result, typename... Types> | ||
| struct type_holder { | ||
| using result_t = Result; | ||
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| template <typename Tail> | ||
| using add_tail = type_holder<Result, Types..., Tail>; | ||
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| template <typename Op> | ||
| constexpr static inline Result evaluate(Op&& op) { | ||
| return op(Types{}...); | ||
| } | ||
| }; | ||
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| template <typename TypeHolder, typename Op> | ||
| inline constexpr auto multi_dispatch_by_data_type(Op&& op) { | ||
| return TypeHolder::evaluate(std::forward<Op>(op)); | ||
| } | ||
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| template <typename TypeHolder, typename Op, typename Head, typename... Tail> | ||
| inline constexpr auto multi_dispatch_by_data_type(Op&& op, Head&& head, Tail&&... tail) { | ||
| using result_t = typename TypeHolder::result_t; | ||
| const auto functor = [&](auto arg) -> result_t { | ||
| using type_t = std::decay_t<decltype(arg)>; | ||
| using holder_t = typename TypeHolder::template add_tail<type_t>; | ||
| return multi_dispatch_by_data_type<holder_t>( // | ||
| std::forward<Op>(op), | ||
| std::forward<Tail>(tail)...); | ||
| }; | ||
| return dispatch_by_data_type(head, functor); | ||
| } | ||
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| template <std::size_t n, typename DefaultType, typename Op, typename... Types> | ||
| struct invoke_result_multiple_impl { | ||
| using next_t = invoke_result_multiple_impl<n - 1, DefaultType, Op, DefaultType, Types...>; | ||
| using type = typename next_t::type; | ||
| }; | ||
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| template <typename DefaultType, typename Op, typename... Types> | ||
| struct invoke_result_multiple_impl<0ul, DefaultType, Op, Types...> { | ||
| using type = std::invoke_result_t<Op, Types...>; | ||
| }; | ||
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| template <typename Op, std::size_t n, typename DefaultType = float> | ||
| using invoke_result_multiple_t = typename invoke_result_multiple_impl<n, DefaultType, Op>::type; | ||
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| } // namespace impl | ||
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| // Signature of this function is slightly different from | ||
| // a simple `dispatch_by_data_type` due to inconsistency | ||
| // with a `std::visit` which it heavily resembles | ||
| template <typename ResultType, typename Op, typename... Types> | ||
| inline constexpr ResultType multi_dispatch_by_data_type(Op&& op, Types&&... types) { | ||
| using holder_t = impl::type_holder<ResultType>; | ||
| return impl::multi_dispatch_by_data_type<holder_t, Op>( // | ||
| std::forward<Op>(op), | ||
| std::forward<Types>(types)...); | ||
| } | ||
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| template <typename Op, typename... Types> | ||
| inline constexpr auto multi_dispatch_by_data_type(Op&& op, Types&&... types) { | ||
| using result_t = impl::invoke_result_multiple_t<Op, sizeof...(Types), float>; | ||
| return multi_dispatch_by_data_type<result_t, Op>( // | ||
| std::forward<Op>(op), | ||
| std::forward<Types>(types)...); | ||
| } | ||
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| } // namespace v1 | ||
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| using v1::dispatch_by_data_type; | ||
| using v1::multi_dispatch_by_data_type; | ||
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| } // namespace oneapi::dal::detail |