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+/* $Id: CoinPackedVectorBase.hpp 1416 2011-04-17 09:57:29Z stefan $ */
+// Copyright (C) 2000, International Business Machines
+// Corporation and others.  All Rights Reserved.
+// This code is licensed under the terms of the Eclipse Public License (EPL).
+
+#ifndef CoinPackedVectorBase_H
+#define CoinPackedVectorBase_H
+
+#include <set>
+#include <map>
+#include "CoinPragma.hpp"
+#include "CoinError.hpp"
+
+class CoinPackedVector;
+
+/** Abstract base class for various sparse vectors.
+
+    Since this class is abstract, no object of this type can be created. The
+    sole purpose of this class is to provide access to a <em>constant</em>
+    packed vector. All members of this class are const methods, they can't
+    change the object. */
+
+class CoinPackedVectorBase  {
+  
+public:
+   /**@name Virtual methods that the derived classes must provide */
+   //@{
+   /// Get length of indices and elements vectors
+   virtual int getNumElements() const = 0;
+   /// Get indices of elements
+   virtual const int * getIndices() const = 0;
+   /// Get element values
+   virtual const double * getElements() const = 0;
+   //@}
+
+   /**@name Methods related to whether duplicate-index checking is performed.
+
+       If the checking for duplicate indices is turned off, then
+       some CoinPackedVector methods may not work correctly if there
+       are duplicate indices.
+       Turning off the checking for duplicate indices may result in
+       better run time performance.
+      */
+   //@{
+   /** \brief Set to the argument value whether to test for duplicate indices
+	      in the vector whenever they can occur.
+       
+       Calling this method with \p test set to true will trigger an immediate
+       check for duplicate indices.
+   */
+   void setTestForDuplicateIndex(bool test) const;
+   /** \brief Set to the argument value whether to test for duplicate indices
+	      in the vector whenever they can occur BUT we know that right
+	      now the vector has no duplicate indices.
+
+       Calling this method with \p test set to true will <em>not</em> trigger
+       an immediate check for duplicate indices; instead, it's assumed that
+       the result of the test will be true.
+   */
+   void setTestForDuplicateIndexWhenTrue(bool test) const;
+   /** Returns true if the vector should be tested for duplicate indices when
+       they can occur. */
+   bool testForDuplicateIndex() const { return testForDuplicateIndex_; }
+   /// Just sets test stuff false without a try etc
+   inline void setTestsOff() const
+   { testForDuplicateIndex_=false; testedDuplicateIndex_=false;}
+   //@}
+
+   /**@name Methods for getting info on the packed vector as a full vector */
+   //@{
+   /** Get the vector as a dense vector. The argument specifies how long this
+       dense vector is. <br>
+       <strong>NOTE</strong>: The user needs to <code>delete[]</code> this
+       pointer after it's not needed anymore.
+   */
+   double * denseVector(int denseSize) const;
+   /** Access the i'th element of the full storage vector.
+       If the i'th is not stored, then zero is returned. The initial use of
+       this method has some computational and storage overhead associated with
+       it.<br>
+       <strong>NOTE</strong>: This is <em>very</em> expensive. It is probably
+       much better to use <code>denseVector()</code>.
+   */
+   double operator[](int i) const; 
+   //@}
+
+   /**@name Index methods */
+   //@{
+   /// Get value of maximum index
+   int getMaxIndex() const;
+   /// Get value of minimum index
+   int getMinIndex() const;
+
+   /// Throw an exception if there are duplicate indices
+   void duplicateIndex(const char* methodName = NULL,
+		       const char * className = NULL) const;
+
+   /** Return true if the i'th element of the full storage vector exists in
+       the packed storage vector.*/
+   bool isExistingIndex(int i) const;
+   
+   /** Return the position of the i'th element of the full storage vector.
+       If index does not exist then -1 is returned  */
+   int findIndex(int i) const;
+ 
+   //@}
+  
+   /**@name Comparison operators on two packed vectors */
+   //@{
+   /** Equal. Returns true if vectors have same length and corresponding
+       element of each vector is equal. */
+   bool operator==(const CoinPackedVectorBase & rhs) const;
+   /// Not equal
+   bool operator!=(const CoinPackedVectorBase & rhs) const;
+
+#if 0
+   // LL: This should be implemented eventually. It is useful to have.
+   /** Lexicographic comparisons of two packed vectors. Returns
+       negative/0/positive depending on whether \c this is
+       smaller/equal.greater than \c rhs */
+   int lexCompare(const CoinPackedVectorBase& rhs);
+#endif
+  
+   /** This method establishes an ordering on packed vectors. It is complete
+       ordering, but not the same as lexicographic ordering. However, it is
+       quick and dirty to compute and thus it is useful to keep packed vectors
+       in a heap when all we care is to quickly check whether a particular
+       vector is already in the heap or not. Returns negative/0/positive
+       depending on whether \c this is smaller/equal.greater than \c rhs. */
+   int compare(const CoinPackedVectorBase& rhs) const;
+
+   /** equivalent - If shallow packed vector A & B are equivalent, then they
+       are still equivalent no matter how they are sorted.
+       In this method the FloatEqual function operator can be specified. The
+       default equivalence test is that the entries are relatively equal.<br> 
+       <strong>NOTE</strong>: This is a relatively expensive method as it
+       sorts the two shallow packed vectors.
+   */
+   template <class FloatEqual> bool
+   isEquivalent(const CoinPackedVectorBase& rhs, const FloatEqual& eq) const
+   {
+      if (getNumElements() != rhs.getNumElements())
+	 return false;
+
+      duplicateIndex("equivalent", "CoinPackedVector");
+      rhs.duplicateIndex("equivalent", "CoinPackedVector");
+
+      std::map<int,double> mv;
+      const int * inds = getIndices();
+      const double * elems = getElements();
+      int i;
+      for ( i = getNumElements() - 1; i >= 0; --i) {
+	 mv.insert(std::make_pair(inds[i], elems[i]));
+      }
+
+      std::map<int,double> mvRhs;
+      inds = rhs.getIndices();
+      elems = rhs.getElements();
+      for ( i = getNumElements() - 1; i >= 0; --i) {
+	 mvRhs.insert(std::make_pair(inds[i], elems[i]));
+      }
+
+      std::map<int,double>::const_iterator mvI = mv.begin();
+      std::map<int,double>::const_iterator mvIlast = mv.end();
+      std::map<int,double>::const_iterator mvIrhs = mvRhs.begin();
+      while (mvI != mvIlast) {
+	 if (mvI->first != mvIrhs->first || ! eq(mvI->second, mvIrhs->second))
+	    return false;
+	 ++mvI;
+	 ++mvIrhs;
+      }
+      return true;
+   }
+
+   bool isEquivalent(const CoinPackedVectorBase& rhs) const;
+   //@}
+
+
+   /**@name Arithmetic operators. */
+   //@{
+   /// Create the dot product with a full vector
+   double dotProduct(const double* dense) const;
+
+   /// Return the 1-norm of the vector
+   double oneNorm() const;
+
+   /// Return the square of the 2-norm of the vector
+   double normSquare() const;
+
+   /// Return the 2-norm of the vector
+   double twoNorm() const;
+
+   /// Return the infinity-norm of the vector
+   double infNorm() const;
+
+   /// Sum elements of vector.
+   double sum() const;
+   //@}
+
+protected:
+
+   /**@name Constructors, destructor
+      <strong>NOTE</strong>: All constructors are protected. There's no need
+      to expose them, after all, this is an abstract class. */
+   //@{
+   /** Default constructor. */
+   CoinPackedVectorBase();
+
+public:
+   /** Destructor */
+   virtual ~CoinPackedVectorBase();
+   //@}
+
+private:
+   /**@name Disabled methods */
+   //@{
+   /** The copy constructor. <br>
+       This must be at least protected, but we make it private. The reason is
+       that when, say, a shallow packed vector is created, first the
+       underlying class, it this one is constructed. However, at that point we
+       don't know how much of the data members of this class we need to copy
+       over. Therefore the copy constructor is not used. */
+   CoinPackedVectorBase(const CoinPackedVectorBase&);
+   /** This class provides <em>const</em> access to packed vectors, so there's
+       no need to provide an assignment operator. */
+   CoinPackedVectorBase& operator=(const CoinPackedVectorBase&);
+   //@}
+   
+protected:
+    
+   /**@name Protected methods */
+   //@{      
+   /// Find Maximum and Minimum Indices
+   void findMaxMinIndices() const;
+
+   /// Return indexSetPtr_ (create it if necessary).
+   std::set<int> * indexSet(const char* methodName = NULL,
+			    const char * className = NULL) const;
+
+   /// Delete the indexSet
+   void clearIndexSet() const;
+   void clearBase() const;
+   void copyMaxMinIndex(const CoinPackedVectorBase & x) const {
+      maxIndex_ = x.maxIndex_;
+      minIndex_ = x.minIndex_;
+   }
+   //@}
+    
+private:
+   /**@name Protected member data */
+   //@{
+   /// Contains max index value or -infinity
+   mutable int maxIndex_;
+   /// Contains minimum index value or infinity
+   mutable int minIndex_;
+   /** Store the indices in a set. This set is only created if it is needed.
+       Its primary use is testing for duplicate indices.
+    */
+   mutable std::set<int> * indexSetPtr_;
+   /** True if the vector should be tested for duplicate indices when they can
+       occur. */
+   mutable bool testForDuplicateIndex_;
+   /** True if the vector has already been tested for duplicate indices. Most
+       of the operations in CoinPackedVector preserves this flag. */
+   mutable bool testedDuplicateIndex_;
+   //@}
+};
+
+#endif