Reclaiming the memory (memory restoration routine) - c++

Question

I have here some line of code. What I am trying to do here is that I would like to allocate 10 objects using overloaded operator new and on the 11th "run out of memory" and throw an exception. I added a static member function that reclaims the memory allocated for the 10th object so that I can use the address back and allocate it to a new object.
I'm still on the learning process for c++ so your critics are highly appreciated.
Help me evaluate my program. I don't know how I can reclaim the memory and then use the address to allocate the next new object.
Thank you.
P.S. how can I use 'this' in overload operator new?
#include <iostream>
#include <cstdlib>
using namespace std;
int count=0;
class RunOutOfMemory : public exception{
public:
const char * Message(){
return "Run out of memory!";
}
};
class ObjectAllocation{
public:
ObjectAllocation(){
cout << count << "Object Allocated at " << &this[count] << endl;
}
//Operator new overloaded
void * operator new(){
count++;
if(count>=11){
throw RunOutOfMemory();
}
}
//Reclaim memory allocated for 10th instance
//so that a new object can be instantiate on its memory address
static void reclaim(){
//delete?
}
};
int main(int argc, char * argv[]){
ObjectAllocation * objAlloc;
int counter=0;
cout << &objAlloc << endl;
while(counter<=20){
counter++;
try{
objAlloc = new ObjectAllocation();
cout << &objAlloc[counter] << endl;
}catch(RunOutOfMemory room){
cout << room.Message() << endl;
objAlloc.reclaim();
}
}
}