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copy_constructor.cpp
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copy_constructor.cpp
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#include <iostream>
using namespace std;
class MyArray
{
public:
MyArray() { cout << "In default constructor" << endl;
dat = NULL; len = 0; }
MyArray(int d[], int num); //normal
MyArray(const MyArray& other);
~MyArray();
int& operator[](int loc) { return dat[loc]; }
int const & operator[](int loc) const { return dat[loc]; }
int size() const { return len; }
private:
int len; int *dat;
};
// Normal constructor
MyArray::MyArray(int d[], int num)
{
dat = new int[num]; len = num;
for(int i=0; i < len; i++){
dat[i] = d[i];
}
}
// Copy Constructor
MyArray::MyArray(const MyArray& other)
{
cout << "In copy constructor" << endl;
len = other.len;
dat = new int[len];
for(int i=0; i < len; i++){
dat[i] = other.dat[i];
}
}
MyArray::~MyArray()
{
cout << "In destructor" << endl;
delete [] dat;
}
void printVals(const MyArray& arr)
{
for(int i=0; i < arr.size(); i++){
cout << arr[i] << " ";
}
cout << endl;
}
int main()
{
int vals[] = {9,3,7,5};
MyArray a1(vals,4);
MyArray a2(a1); // calls copy constructor
MyArray a3 = a1; // calls copy constructor
MyArray a4;
a4 = a1; // calls default assignment
// how are the contents of a2, a3, a4
// related to a1
printVals(a1);
a1[0] = 11;
printVals(a2);
printVals(a4);
return 0;
}