| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| **/ |
| |
| #ifndef QUICKSTEP_UTILITY_COMPOSITE_HASH_HPP_ |
| #define QUICKSTEP_UTILITY_COMPOSITE_HASH_HPP_ |
| |
| #include <cstddef> |
| #include <vector> |
| |
| #include "types/TypedValue.hpp" |
| #include "utility/HashPair.hpp" |
| |
| #include "glog/logging.h" |
| |
| namespace quickstep { |
| |
| /** |
| * @brief Compute the hash value of a composite key. |
| * |
| * @param key A vector of TypedValues which together form the composite key. |
| * @return The hash value. |
| **/ |
| static std::size_t HashCompositeKey(const std::vector<TypedValue> &key) { |
| DCHECK(!key.empty()); |
| std::size_t hash = key.front().getHash(); |
| for (std::vector<TypedValue>::const_iterator key_it = key.begin() + 1; |
| key_it != key.end(); |
| ++key_it) { |
| hash = CombineHashes(hash, key_it->getHash()); |
| } |
| return hash; |
| } |
| |
| } // namespace quickstep |
| |
| #endif // QUICKSTEP_UTILITY_COMPOSITE_HASH_HPP_ |