Overloading new operator using friend function - c++

Question

I have overloaded 'new' operator as a member function for my class Array. I need help overloading it as a friend function. See the program below:
#include<iostream>
using namespace std;
class Array {
private:
int *arr;
int size;
public:
void * operator new (size_t size)
{
void *ptr = ::new Array;
return ptr;
}
void operator delete(void *ptr)
{
::delete ptr;
}
Array(int n=5)
{
this->size = n;
this->arr = new int[n];
}
void input()
{
cout<<"Enter the values"<<endl;
for(int i=0; i<size; i++)
cin>>arr[i];
}
void show()
{
for(int i=0; i<size; i++)
cout<<arr[i]<<" ";
cout<<endl;
}
};
int main()
{
Array *A = new Array(4);
A->input();
A->show();
return 0;
}
What I tried to do in friend function:
void * operator new (size_t size) throw (std::bad_alloc)
{
void * ptr = ::new Array;
return ptr;
}
I got an infinite loop for this. Can anyone help me here?
Edit : Grammar

Answer 1

There can be only one ::operator new(size_t). Normally the standard library provides one. If you provide one, it replaces (doesn't overload) the one provided by the standard library.
Your version calls itself unconditionally (there's no other ::operator new(size_t)) so there's an unbounded recursion and a stack overflow in there.
You cannot provide ::operator new(size_t) and hope it will work together with the system-provided ::operator new(size_t) but only for your class.
The only way to make a global overloaded operator new is to give it a different signature, e.g.
enum foo {bar};
void* operator new (std::size_t size, foo) { ... }
...
Array* arr = new (bar) Array;
But you can use it to allocate any type, not just Array, regardless of which classes decide to befriend it.

Answer 2

So just adding on above answer you can overload your operator new and delete in following manner and this will work because one inside constructor will call operator new[] not operator new.Also no need to make this friend since you are not accessing any private data member in this function:
#include <iostream>
#include <string>
using namespace std;
class Array {
private:
int *arr;
int size;
public:
Array(int n=5)
{
this->size = n;
this->arr = new int[n];
}
void input()
{
cout<<"Enter the values"<<endl;
for(int i=0; i<size; i++)
cin>>arr[i];
}
void show()
{
for(int i=0; i<size; i++)
cout<<arr[i]<<" ";
cout<<endl;
}
};
void * operator new (size_t size)
{
void *ptr = std::malloc(size);
return ptr;
}
void operator delete(void *ptr)
{
std::free(ptr);
}
int main()
{
Array *A = new Array(4);
A->input();
A->show();
return 0;
}