| /** |
| * 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 _HDFS_LIBHDFS3_COMMON_HASH_H_ |
| #define _HDFS_LIBHDFS3_COMMON_HASH_H_ |
| |
| #include "platform.h" |
| |
| #include <string> |
| #include <vector> |
| |
| #ifdef NEED_BOOST |
| |
| #include <boost/functional/hash.hpp> |
| |
| namespace hdfs { |
| namespace internal { |
| |
| /** |
| * A hash function object used to hash a boolean value. |
| */ |
| extern boost::hash<bool> BoolHasher; |
| |
| /** |
| * A hash function object used to hash an int value. |
| */ |
| extern boost::hash<int> Int32Hasher; |
| |
| /** |
| * A hash function object used to hash an 64 bit int value. |
| */ |
| extern boost::hash<int64_t> Int64Hasher; |
| |
| /** |
| * A hash function object used to hash a size_t value. |
| */ |
| extern boost::hash<size_t> SizeHasher; |
| |
| /** |
| * A hash function object used to hash a std::string object. |
| */ |
| extern boost::hash<std::string> StringHasher; |
| |
| } |
| } |
| |
| #define HDFS_HASH_DEFINE(TYPE) \ |
| namespace boost{ \ |
| template<> \ |
| struct hash<TYPE> { \ |
| std::size_t operator()(const TYPE & key) const { \ |
| return key.hash_value(); \ |
| } \ |
| }; \ |
| } |
| |
| #else |
| |
| #include <functional> |
| |
| namespace hdfs { |
| namespace internal { |
| |
| /** |
| * A hash function object used to hash a boolean value. |
| */ |
| extern std::hash<bool> BoolHasher; |
| |
| /** |
| * A hash function object used to hash an int value. |
| */ |
| extern std::hash<int> Int32Hasher; |
| |
| /** |
| * A hash function object used to hash an 64 bit int value. |
| */ |
| extern std::hash<int64_t> Int64Hasher; |
| |
| /** |
| * A hash function object used to hash a size_t value. |
| */ |
| extern std::hash<size_t> SizeHasher; |
| |
| /** |
| * A hash function object used to hash a std::string object. |
| */ |
| extern std::hash<std::string> StringHasher; |
| |
| } |
| } |
| |
| #define HDFS_HASH_DEFINE(TYPE) \ |
| namespace std{ \ |
| template<> \ |
| struct hash<TYPE> { \ |
| std::size_t operator()(const TYPE & key) const { \ |
| return key.hash_value(); \ |
| } \ |
| }; \ |
| } |
| |
| #endif |
| |
| namespace hdfs { |
| namespace internal { |
| |
| /** |
| * A hash function used to hash a vector of size_t values. |
| * @param vec The vector's reference which items are to be hashed. |
| * @param size The size of vec. |
| * @return The hash value. |
| * @throw nothrow |
| */ |
| static inline size_t CombineHasher(const size_t *vec, size_t size) { |
| size_t value = 0; |
| |
| for (size_t i = 0; i < size; ++i) { |
| value ^= SizeHasher(vec[i]) << 1; |
| } |
| |
| return value; |
| } |
| |
| } |
| } |
| |
| #endif /* _HDFS_LIBHDFS3_COMMON_HASH_H_ */ |