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This example presents a derived class of the partially filled array class PFArrayD that we presented in 10 (Display 1010) For reference we repeat the header file for the base class PFArrayD in Display 148 We repeat as much as we will discuss of the implementation for the base class PFArrayD in Display 149 Note that we have made one important change to the definition presented in 10 We have changed the member variables from private to protected This will allow member functions in the derived class to access the member variables by name We will define a derived class called PFArrayDBak using PFArrayD as a base class An object of the derived class PFArrayDBak will have all the member functions of the base class PFArrayD and can be used just like an object of the class PFArrayD, but an object of the class PFArrayDBak will have the following added feature: There is a member function called backup that can make a backup copy of all the data in the partially filled array, and at any later time the programmer can use the member function restore to restore the partially filled array to the state it was in just before the last invocation of backup If the meaning of these added member functions is not clear, you should peek ahead to the sample demonstration program shown in Display 1412 The interface for the derived class PFArrayDBak is shown in Display 1410 The class PFArrayDBak adds two member variables to hold a backed-up copy of the partially filled array: a member variable b of type double* that will point to a dynamic array with the backup version of the (inherited) working array, and an int member variable named usedB to indicate how much of the backed-up array b is filled with data Since there is no way to change the capacity of a PFArrayD (or a PFArrayDBak), there is no need to back up the capacity value All the basic functions for handling a partially filled array are inherited unchanged from the base class PFArrayD These inherited functions manipulate the inherited array a and the inherited int variable used just as they did in the base class PFArrayD The implementation of the new member functions for the class PFArrayDBak is shown in Display 1411 The constructors of the derived class PFArrayDBak rely on the constructors of the base class to set up the regular partially filled array (inherited member variables a, used, and capacity) Each constructor also creates a new dynamic array of the same size as the array a This second array is the array b used for backing up the data in a
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Display 148 Interface for the Base Class PFArrayD
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 //This is the header file pfarraydh This is the interface for the class //PFArrayD Objects of this type are partially filled arrays of doubles #ifndef PFARRAYD_H #define PFARRAYD_H This class is the same as the one in Display
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1010, except that we have made the member
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class PFArrayD variables protected instead of private { public: PFArrayD( ); //Initializes with a capacity of 50 PFArrayD(int capacityValue); PFArrayD(const PFArrayD& pfaObject);
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It would be good to place this class in a namespace, but we have not done so in order to keep the example simple
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void addElement(double element); //Precondition: The array is not full //Postcondition: The element has been added bool full( ) const; //Returns true if the array is full, false otherwise int getCapacity( ) const; int getNumberUsed( ) const; void emptyArray( ); //Resets the number used to zero, effectively emptying the array double& operator[](int index); //Read and change access to elements 0 through numberUsed - 1 PFArrayD& operator =(const PFArrayD& rightSide); ~PFArrayD( ); protected: double *a; //for an array of doubles int capacity; //for the size of the array int used; //for the number of array positions currently in use }; #endif //PFARRAYD_H
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