CLARRAY example shown here is a complete program that shows one way to create your own array class: // clarray.cpp // creates array class #include using namespace std; //////////////////////////////////////////////////////////////// class Array //models a normal C++ array { private: int* ptr; //pointer to Array contents int size; //size of Array public: Array(int s) //one-argument constructor { size = s; //argument is size of Array ptr = new int[s]; //make space for Array } ~Array() //destructor { delete[] ptr; } int& operator [] (int j) //overloaded subscript operator { return *(ptr+j); } }; //////////////////////////////////////////////////////////////// int main() { const int ASIZE = 10; //size of array Array arr(ASIZE); //make an array for(int j=0; j
It’s possible to make a class that acts like an array. The CLARRAY example shown here is a complete program that shows one way to create your own array class:
// clarray.cpp
// creates array class
#include <iostream>
using namespace std;
////////////////////////////////////////////////////////////////
class Array //models a normal C++ array
{
private:
int* ptr; //pointer to Array contents
int size; //size of Array
public:
Array(int s) //one-argument constructor
{
size = s; //argument is size of Array
ptr = new int[s]; //make space for Array
}
~Array() //destructor
{
delete[] ptr;
}
int& operator [] (int j) //overloaded subscript operator
{
return *(ptr+j);
}
};
////////////////////////////////////////////////////////////////
int main()
{
const int ASIZE = 10; //size of array
Array arr(ASIZE); //make an array
for(int j=0; j<ASIZE; j++) //fill it with squares
{
arr[j] = j*j;
}
for(int j=0; j<ASIZE; j++) //display its contents
{
cout << arr[j] <<" ";
cout << endl;
}
return 0;
}
The output of this program is
0 1 4 9 16 25 36 49 64 81
Starting with CLARRAY, add an overloaded assignment operator and an overloaded copy constructor to the Array class. Then add statements such as
Array arr2 (arr1);
and
arr3 = arr1;
to the main() program to test whether these overloaded operators work. The copy constructor should create an entirely new Array object with its own memory for storing array elements. Both the copy constructor and the assignment operator should copy the contents of the old Array object to the new one. What happens if you assign an Array of one size to an Array of a different size?
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