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#ifndef QPID_HA_HASH_H
#define QPID_HA_HASH_H
/*
*
* 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.
*
*/
#include "qpid/types/Uuid.h"
#include <boost/shared_ptr.hpp>
#include <utility>
namespace qpid {
namespace ha {
// TODO aconway 2013-08-06: would like to use boost::hash or std::hash here
// but not available/working on some older compilers.
// Add overloads as needed.
inline std::size_t hashValue(bool v) { return static_cast<std::size_t>(v); }
inline std::size_t hashValue(char v) { return static_cast<std::size_t>(v); }
inline std::size_t hashValue(unsigned char v) { return static_cast<std::size_t>(v); }
inline std::size_t hashValue(signed char v) { return static_cast<std::size_t>(v); }
inline std::size_t hashValue(short v) { return static_cast<std::size_t>(v); }
inline std::size_t hashValue(unsigned short v) { return static_cast<std::size_t>(v); }
inline std::size_t hashValue(int v) { return static_cast<std::size_t>(v); }
inline std::size_t hashValue(unsigned int v) { return static_cast<std::size_t>(v); }
inline std::size_t hashValue(long v) { return static_cast<std::size_t>(v); }
inline std::size_t hashValue(unsigned long v) { return static_cast<std::size_t>(v); }
inline std::size_t hashValue(const types::Uuid& v) { return v.hash(); }
template <class T> inline std::size_t hashValue(T* v) {
std::size_t x = static_cast<std::size_t>(reinterpret_cast<std::ptrdiff_t>(v));
return x + (x >> 3);
}
template <class T> inline std::size_t hashValue(boost::shared_ptr<T> v) {
return hashValue(v.get());
}
template <class T> inline void hashCombine(std::size_t& seed, const T& v) {
seed ^= hashValue(v) + 0x9e3779b9 + (seed<<6) + (seed>>2);
}
template <class T, class U> inline size_t hashValue(const std::pair<T,U>& v) {
std::size_t seed = 0;
hashCombine(seed, v.first);
hashCombine(seed, v.second);
return seed;
}
template<class T> struct Hasher {
size_t operator()(const T& v) const { return hashValue(v); }
};
}} // namespace qpid::ha
#endif /*!QPID_HA_HASH_H*/
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