Overload [] to create a generic safe array type.
#include <iostream>
#include <cstdlib>
using namespace std;
template <class T, int len> class safe_array {
T ar[len];
int length;
public:
safe_array();
T &operator[](int i);
int getlen() { return length; }
};
template <class T, int len> safe_array<T, len>::safe_array() {
for(int i=0; i < len; ++i) ar[i] = T();
length = len;
}
template <class T, int len> T &safe_array<T, len>::operator[](int i)
{
if(i < 0 || i > len-1) {
cout << "\nIndex value of " << i << " is out-of-bounds.\n";
exit(1);
}
return ar[i];
}
class myclass {
public:
int x;
myclass(int i) { x = i; };
myclass() { x = -1; }
};
int main()
{
safe_array<int, 10> intArray;
safe_array<double, 5> doubleArray;
int i;
for(i=0; i < intArray.getlen(); ++i)
cout << intArray[i] << endl;
for(i=0; i < intArray.getlen(); ++i)
intArray[i] = i;
for(i=0; i < intArray.getlen(); ++i)
cout << intArray[i] << endl;
for(i=0; i < doubleArray.getlen(); ++i)
cout << doubleArray[i] << endl;
for(i=0; i < doubleArray.getlen(); ++i)
doubleArray[i] = (double) i/3;
for(i=0; i < doubleArray.getlen(); ++i)
cout << doubleArray[i] << endl;
safe_array<myclass, 3> classArray; // myclass array of size 3
cout << "Initial values in classArray: ";
for(i = 0; i < classArray.getlen(); ++i) cout << classArray[i].x << " ";
cout << endl;
classArray[0].x = 9;
classArray[1].x = 9;
classArray[2].x = -9;
cout << "New values for classArray: ";
for(i = 0; i < classArray.getlen(); ++i) cout << classArray[i].x << " ";
cout << endl;
intArray[12] = 100;
return 0;
}
Related examples in the same category
