/*     FILE: array7.cpp     */
/* An array with bounds checking.
    Assignment creates duplicate and deletes old
    array of values. (Memory leak.)
*/
#include <iostream>
#include <cstdlib>

using namespace std;
class safe_array {
    float * ptr;
    int size;
public:
    safe_array(int length);
    safe_array(const safe_array & param);
    ~safe_array() { delete[] ptr; }
    float &operator[ ](int index);
    safe_array &operator=(const safe_array & operand2);

    int getSize() const;
};

safe_array::safe_array(int length)
{
    ptr = new float[size = length];
}

safe_array::safe_array(const safe_array & param)
{
    ptr = new float[size = param.size];
    for (int i = 0; i < size; i++)
        ptr[i] = param.ptr[i];
}

safe_array & safe_array::operator=(const safe_array & operand2)
{
    if (this != &operand2)
    {
        delete[] ptr;
        ptr = new int[size = operand2.size];
        for (int i = 0; i < size; i++)
            ptr[i] = operand2.ptr[i];
    }

    return *this;
}

float& safe_array::operator[ ](int index)
{
    if (index < 0 || size - 1 < index)
        abort();
    return ptr[index];
}

int safe_array::getSize() const
{
    return size;
}

int main()
{
    int i;
    safe_array ar(5);
    safe_array ar2(7);

    for (i = 0; i < ar.getSize(); i++)
        ar[i] = i;

    for (i = 0; i < ar2.getSize(); i++)
        ar2[i] = i * 10;

    for (i = 0; i < ar.getSize(); i++)   // display array ar
        cout << "ar[" << i << "] = " << ar[i] << endl;
    cout << endl;

    for (i = 0; i < ar2.getSize(); i++)   // display array ar2
        cout << "ar2[" << i << "] = " << ar2[i] << endl;   cout << endl;

    ar2 = ar;

    for (i = 0; i < ar2.getSize(); i++)   // display array ar2
        cout << "ar2[" << i << "] = " << ar2[i] << endl;   cout << endl;

    for (i = 0; i < ar.getSize(); i++)   // alter array ar
        ar[i] = i * 11;

    for (i = 0; i < ar.getSize(); i++)   // display array ar
        cout << "ar[" << i << "] = " << ar[i] << endl;
    cout << endl;

    for (i = 0; i < ar2.getSize(); i++)   // display array ar2
        cout << "ar2[" << i << "] = " << ar2[i] << endl;

    return 0;
}