A complete example with an overloaded assignment operator is given in the next programming example in Software

Creator DataMatrix in Software A complete example with an overloaded assignment operator is given in the next programming example
A complete example with an overloaded assignment operator is given in the next programming example
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The class PFArrayD in Displays 1010 and 1011 is a class for a partially filled array of doubles5 As shown in the demonstration program in Display 1012, an object of the class PFArrayD can be accessed using the square brackets just like an ordinary array, but the object also automatically keeps track of how much of the array is in use Thus, it functions like a partially filled array The
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member function getNumberUsed returns the number of array positions used and can thus be used in a for loop as in the following sample code:
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PFArrayD stuff(cap);//cap is an int variable <some code to fill object stuff with elements> for (int index = 0; index < stuffgetNumberUsed( ); index++) cout << stuff[index] << " ";
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An object of the class PFArrayD has a dynamic array as a member variable This member variable array stores the elements The dynamic array member variable is actually a pointer variable In each constructor, this member variable is set to point at a dynamic array There are also two member variables of type int: The member variable capacity records the size of the dynamic array, and the member variable used records the number of array positions that have been filled so far As is customary with partially filled arrays, the elements must be filled in order, going first into position 0, then 1, then 2, and so forth An object of the class PFArrayD can be used as a partially filled array of doubles It has some advantages over an ordinary array of doubles or a dynamic array of doubles Unlike the standard arrays, this array gives an error message if an illegal array index is used Also, an object of the class PFArrayD does not require an extra int variable to keep track of how much of the array is used (You may protest that There is such an int variable It s a member variable However, that member variable is a private member variable in the implementation, and a programmer who uses the class PFArrayD need never be aware of that member variable) An object of the class PFArrayD only works for storing values of type double When we discuss templates in 16, you will see that it would be easy to convert the definition to a template class that would work for any type, but for now we will settle for storing elements of type double Most of the details in the definition of the class PFArrayD use only items covered before now, but there are three new items: a copy constructor, a destructor, and an overloading of the assignment operator We explain the overloaded assignment operator next and discuss the copy constructor and destructor in the next two subsections To see why you want to overload the assignment operator, suppose that the overloading of the assignment operator were omitted from Displays 1010 and 1011 Suppose list1 and list2 are then declared as follows:
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PFArrayD list1(10), list2(20);
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If you have already read the section of 7 on vectors, you will notice that the class defined here is a weak version of a vector Even though you can use a vector anyplace that you would use this class, this is still an instructive example using many of the techniques we discussed in this chapter Moreover, this example will give you some insight into how a vector class might be implemented
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Display 1010 Definition of a Class with a Dynamic Array Member
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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 //Objects of this class are partially filled arrays of doubles class PFArrayD { public: PFArrayD( ); //Initializes with a capacity of 50 PFArrayD(int capacityValue);
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