60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#pragma once
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#include <limits>
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#include <variant>
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namespace doris::vectorized {
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template <typename LoopType, LoopType start, LoopType end, template <LoopType> typename Reducer>
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struct constexpr_loop_match {
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template <typename... TArgs>
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static void run(LoopType target, TArgs&&... args) {
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if constexpr (start <= end) {
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if (start == target) {
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Reducer<start>::run(std::forward<TArgs>(args)...);
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} else {
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constexpr_loop_match<LoopType, start + 1, end, Reducer>::run(
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target, std::forward<TArgs>(args)...);
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}
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}
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}
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};
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template <int start, int end, template <int> typename Reducer>
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using constexpr_int_match = constexpr_loop_match<int, start, end, Reducer>;
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std::variant<std::false_type, std::true_type> inline make_bool_variant(bool condition) {
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if (condition) {
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return std::true_type {};
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} else {
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return std::false_type {};
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}
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}
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template <typename... Callables>
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struct Overload : Callables... {
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using Callables::operator()...;
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};
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template <typename... Callables>
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Overload(Callables&&... callables) -> Overload<Callables...>;
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} // namespace doris::vectorized
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