/data/refman/pasoursint/CMSSW_5_3_1/src/RecoParticleFlow/PFClusterTools/interface/Operators.h

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#ifndef OPERATORS_H_
#define OPERATORS_H_
#include "TH1F.h"
#include <iostream>
#include <vector>
#include <map>

/*
 * Pair-wise addition of std::pairs
 */
template <class T> std::pair<T, T> operator+(const std::pair<T, T>& one, const std::pair<T, T>& two) {
        std::pair<T, T> r(one.first + two.first, one.second + two.second);
        return r;
}

/*
 * Pair-wise subtraction or std::pairs
 */
template <class T> std::pair<T, T> operator-(const std::pair<T, T>& one, const std::pair<T, T>& two) {
        std::pair<T, T> r(one.first - two.first, one.second - two.second);
        return r;
}

/*
 * Streams std::pair contents to stream
 */
template <class T> std::ostream& operator<<(std::ostream& s, const std::pair<T, T>& aT) {
        s << "(" << aT.first << ", " << aT.second << ")";
        return s;
}

/*
 * Extracts the value set from a std::map
 */
template <class K, class V> void valueVector(const std::map<K, V>& extract, std::vector<V>& output) {
        for(typename std::map<K, V>::const_iterator cit = extract.begin(); cit != extract.end(); ++cit) {
                output.push_back((*cit).second);
        }
}

/*
 * Extracts the key set from a std::map
 */
template <class K, class V> void keyVector(const std::map<K, V>& extract, std::vector<K>& output) {
        for(typename std::map<K, V>::const_iterator cit = extract.begin(); cit != extract.end(); ++cit) {
                output.push_back((*cit).first);
        }
}

#endif /*OPERATORS_H_*/