Creates array class, overloads assignment operator and copy constructor - C++ Class

C++ examples for Class:Operator Overload

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Description

Creates array class, overloads assignment operator and copy constructor

Demo Code

                                                                                                                                                                                                                             
#include <iostream>
using namespace std;
class Array/*www .  j a  va2  s .  co m*/
{
private:
  int* ptr;                 //pointer to "array" contents
  int size;                 //size of array
public:
  Array() : ptr(0), size(0) //no-argument constructor
  { }
  Array(int s) : size(s)    //one-argument constructor
  {
    ptr = new int[s];
  }
  Array(Array&);            //copy constructor
  ~Array()                  //destructor
  {
    delete[] ptr;
  }
  int& operator [] (int j)  //overloaded subscript op
  {
    return *(ptr + j);
  }
  Array& operator = (Array&);  //overloaded = operator
};
Array::Array(Array& a)          //copy constructor
{
  size = a.size;               //new one is same size
  ptr = new int[size];         //get space for contents
  for (int j = 0; j<size; j++)    //copy contents to new one
    *(ptr + j) = *(a.ptr + j);
}
Array& Array::operator = (Array& a)  //overloaded = operator
{
  delete[] ptr;                //delete old contents (if any)
  size = a.size;               //make this object same size
  ptr = new int[a.size];       //get space for new contents
  for (int j = 0; j<a.size; j++)  //copy contents to this object
    *(ptr + j) = *(a.ptr + j);
  return *this;                //return this object
}
int main()
{
  const int ASIZE = 10;        //size of array
  Array arr1(ASIZE);           //make an array
  for (int j = 0; j<ASIZE; j++)   //fill it with squares
    arr1[j] = j*j;
  Array arr2(arr1);            //use the copy constructor
  cout << "\narr2: ";
  for (int j = 0; j<ASIZE; j++)       //check that it worked
    cout << arr2[j] << "  ";
  Array arr3, arr4;            //make two empty Array objects
  arr4 = arr3 = arr1;          //use the assignment operator
  cout << "\narr3: ";
  for (int j = 0; j<ASIZE; j++)       //check that it worked on arr3
    cout << arr3[j] << "  ";
  cout << "\narr4: ";
  for (int j = 0; j<ASIZE; j++)       //check that it worked on arr4
    cout << arr4[j] << "  ";
  cout << endl;
  return 0;
}

Result


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