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authorharpreet2016-07-01 00:11:55 +0530
committerharpreet2016-07-01 00:11:55 +0530
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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