C / C++ / MFC

// MyArray.h

#include <stdexcept>

#define CORE_ARRAY_DEFAULT_LENGTH 20

template <class T>
class Array
{
private:
T** _array;
int _size;
int _length;

public:
Array(void)
{
_array = new T*[CORE_ARRAY_DEFAULT_LENGTH]();
_size = CORE_ARRAY_DEFAULT_LENGTH;
_length = 0;
}
~Array(void) { Clear(); }

int Size(void) const { return _size; }
int Length(void) const { return _length; }

T operator [] (int index) const
{
if ((index < 0) || (index >= _length))
   throw std::out_of_range("index");
else
   return * _array[index];
}

void Add(T value)
{
if (_length == _size)
   Resize();

_array[_length] = new T(value);
++_length;
}

/* Other functions follow CopyArray(), CloneArray(), Resize(), Clear(), InsertAt(), etc... */
}

#include "MyArray.h"
#include <cstdlib>
#include <cstdio>

void main(void)
{
// This behaves as expected
Array<int> iArrayA;

for (int i = 0; i < 10; ++i)
   iArrayA.Add(i);
for (int i = 0; i < 10; ++i)
   printf("%d\n", iArrayA[i]);

// But this was returning odd results
Array<int> * iArrayB = new Array<int>();

for (int i = 0; i < 10; ++i)
   iArrayB->Add(i);  // confirmed that the values were stored correctly
for (int i = 0; i < 10; ++i)
   printf("%d\n", iArrayB[i];  // outputs were not what I expected

delete iArrayB;

system("pause");
}

printf("%d\n", iArrayB[0][i]);