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+/* $Id: CoinShallowPackedVector.hpp 1498 2011-11-02 15:25:35Z mjs $ */
+// 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 CoinShallowPackedVector_H
+#define CoinShallowPackedVector_H
+
+#if defined(_MSC_VER)
+// Turn off compiler warning about long names
+#  pragma warning(disable:4786)
+#endif
+
+#include "CoinError.hpp"
+#include "CoinPackedVectorBase.hpp"
+
+/** Shallow Sparse Vector
+ 
+This class is for sparse vectors where the indices and 
+elements are stored elsewhere.  This class only maintains
+pointers to the indices and elements.  Since this class
+does not own the index and element data it provides
+read only access to to the data.  An CoinSparsePackedVector
+must be used when the sparse vector's data will be altered.
+
+This class stores pointers to the vectors.
+It does not actually contain the vectors.
+
+Here is a sample usage:
+@verbatim
+   const int ne = 4; 
+   int inx[ne] =   {  1,   4,  0,   2 }; 
+   double el[ne] = { 10., 40., 1., 50. }; 
+ 
+   // Create vector and set its value 
+   CoinShallowPackedVector r(ne,inx,el); 
+ 
+   // access each index and element 
+   assert( r.indices ()[0]== 1  ); 
+   assert( r.elements()[0]==10. ); 
+   assert( r.indices ()[1]== 4  ); 
+   assert( r.elements()[1]==40. ); 
+   assert( r.indices ()[2]== 0  ); 
+   assert( r.elements()[2]== 1. ); 
+   assert( r.indices ()[3]== 2  ); 
+   assert( r.elements()[3]==50. ); 
+ 
+   // access as a full storage vector 
+   assert( r[ 0]==1. ); 
+   assert( r[ 1]==10.); 
+   assert( r[ 2]==50.); 
+   assert( r[ 3]==0. ); 
+   assert( r[ 4]==40.); 
+ 
+   // Tests for equality and equivalence
+   CoinShallowPackedVector r1; 
+   r1=r; 
+   assert( r==r1 ); 
+   r.sort(CoinIncrElementOrdered()); 
+   assert( r!=r1 ); 
+ 
+   // Add packed vectors. 
+   // Similarly for subtraction, multiplication, 
+   // and division. 
+   CoinPackedVector add = r + r1; 
+   assert( add[0] ==  1.+ 1. ); 
+   assert( add[1] == 10.+10. ); 
+   assert( add[2] == 50.+50. ); 
+   assert( add[3] ==  0.+ 0. ); 
+   assert( add[4] == 40.+40. ); 
+   assert( r.sum() == 10.+40.+1.+50. ); 
+@endverbatim
+*/
+class CoinShallowPackedVector : public CoinPackedVectorBase {
+   friend void CoinShallowPackedVectorUnitTest();
+
+public:
+  
+   /**@name Get methods */
+   //@{
+   /// Get length of indices and elements vectors
+   virtual int getNumElements() const { return nElements_; }
+   /// Get indices of elements
+   virtual const int * getIndices() const { return indices_; }
+   /// Get element values
+   virtual const double * getElements() const { return elements_; }
+   //@}
+
+   /**@name Set methods */
+   //@{
+   /// Reset the vector (as if were just created an empty vector)
+   void clear();
+   /** Assignment operator. */
+   CoinShallowPackedVector& operator=(const CoinShallowPackedVector & x);
+   /** Assignment operator from a CoinPackedVectorBase. */
+   CoinShallowPackedVector& operator=(const CoinPackedVectorBase & x);
+   /** just like the explicit constructor */
+   void setVector(int size, const int * indices, const double * elements,
+		  bool testForDuplicateIndex = true);
+   //@}
+
+   /**@name Methods to create, set and destroy */
+   //@{
+   /** Default constructor. */
+   CoinShallowPackedVector(bool testForDuplicateIndex = true);
+   /** Explicit Constructor.
+       Set vector size, indices, and elements. Size is the length of both the
+       indices and elements vectors. The indices and elements vectors are not
+       copied into this class instance. The ShallowPackedVector only maintains
+       the pointers to the indices and elements vectors. <br>
+       The last argument specifies whether the creator of the object knows in
+       advance that there are no duplicate indices.
+   */
+   CoinShallowPackedVector(int size,
+			  const int * indices, const double * elements,
+			  bool testForDuplicateIndex = true);
+   /** Copy constructor from the base class. */
+   CoinShallowPackedVector(const CoinPackedVectorBase &);
+   /** Copy constructor. */
+   CoinShallowPackedVector(const CoinShallowPackedVector &);
+   /** Destructor. */
+   virtual ~CoinShallowPackedVector() {}
+   /// Print vector information.
+   void print();
+   //@}
+
+private:
+   /**@name Private member data */
+   //@{
+   /// Vector indices
+   const int * indices_;
+   ///Vector elements
+   const double * elements_;
+   /// Size of indices and elements vectors
+   int nElements_;
+   //@}
+};
+
+//#############################################################################
+/** A function that tests the methods in the CoinShallowPackedVector class. The
+    only reason for it not to be a member method is that this way it doesn't
+    have to be compiled into the library. And that's a gain, because the
+    library should be compiled with optimization on, but this method should be
+    compiled with debugging. */
+void
+CoinShallowPackedVectorUnitTest();
+
+#endif