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IndexedReal.hpp

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/*==========================================================================
 * Copyright (c) 2001 Carnegie Mellon University.  All Rights Reserved.
 *
 * Use of the Lemur Toolkit for Language Modeling and Information Retrieval
 * is subject to the terms of the software license set forth in the LICENSE
 * file included with this software, and also available at
 * http://www.cs.cmu.edu/~lemur/license.html
 *
 *==========================================================================
*/


#ifndef _INDEXEDREAL_HPP
#define _INDEXEDREAL_HPP


// CLASSES: IndexedReal, IndexedRealVector (C. Zhai, 12/1/2000)

#include "common_headers.hpp"
#include <algorithm>

struct IndexedReal {
  int ind;
  double val;
};


class IndexedRealVector : public vector<IndexedReal> {
public:
  
  IndexedRealVector() : vector<IndexedReal>() {}
  IndexedRealVector(int size) : vector<IndexedReal>(size) {}
  virtual ~IndexedRealVector() {}
  virtual iterator FindByIndex(int index);

  // return true iff the entry already exists.
  virtual bool IncreaseValueFor(int index, double value);

  virtual void PushValue(int index, double value);

  virtual void Sort(bool descending = true);
private:


  class IndexedRealAscending {
  public:
    bool operator()(const IndexedReal & a, const IndexedReal & b) {
      return a.val < b.val;  // based on the real value
    }
  };

  class IndexedRealDescending { 
  public: 
    bool operator()(const IndexedReal & a, const IndexedReal & b) {
      return a.val > b.val;  // based on the real value
    }
  };

  static IndexedRealAscending ascendOrder;
  static IndexedRealDescending descendOrder;

};



#endif //_INDEXEDREAL_HPP


  

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