SparseVectorMap.hh

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/*
    Copyright (c) 2002-2012 Tampere University.
 
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/**
 * @file SparseVectorMap.hh
 *
 * @author Heikki Kultala (heikki.kultala-no.spam-tut.fi) 2012
 *
 * std::map-based container that can act as sparse vector.
 *
 * size() overriden to give index of last element+1 instead
 * number of elements.
 *
 */
 
#ifndef TTA_SPARSE_VECTOR_MAP_HH
#define TTA_SPARSE_VECTOR_MAP_HH
 
#include <map>
#include <utility>
 
template<class ValueType>
class SparseVector: public std::map<unsigned int, ValueType> {
public:
    size_t size() const {
        typename std::map<unsigned int, ValueType>::const_reverse_iterator i = 
            std::map<unsigned int, ValueType>::rbegin();
        if (i != std::map<unsigned int, ValueType>::rend()) {
            return (i->first)+1;
        } else {
            return 0;
        }
    }
    size_t number_of_elements() const {
        return std::map<unsigned int, ValueType>::size();
    }
};
 
#endif