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#ifndef QPID_CLUSTER_NUMBERING_H
#define QPID_CLUSTER_NUMBERING_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 <map>
#include <vector>
namespace qpid {
namespace cluster {
/**
* A set of numbered T, with two way mapping number->T T->number
* Used to construct numberings of objects by code sending and receiving updates.
*/
template <class T> class Numbering
{
public:
size_t size() const { return byNumber.size(); }
size_t add(const T& t) {
size_t n = (*this)[t]; // Already in the set?
if (n == size()) {
byObject[t] = n;
byNumber.push_back(t);
}
return n;
}
void clear() { byObject.clear(); byNumber.clear(); }
/**@return object at index n or T() if n > size() */
T operator[](size_t n) const { return(n < size()) ? byNumber[n] : T(); }
/**@return index of t or size() if t is not in the map */
size_t operator[](const T& t) const {
typename Map::const_iterator i = byObject.find(t);
return (i != byObject.end()) ? i->second : size();
}
private:
typedef std::map<T, size_t> Map;
Map byObject;
std::vector<T> byNumber;
};
}} // namespace qpid::cluster
#endif /*!QPID_CLUSTER_NUMBERING_H*/
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