Thread: Accessing data declared private within header file

I have a header file that declares some fields as private, I then have a class that I need to compare two of the objects' information for equality but neither of them are the calling objects. I cannot alter the header file. How would I go about comparing private data fields? I will enter a brief bit of code for clarity.
Thank You.

Code:

// Header File
// stuff.h

class stuff
{
private: 
  int* arr[20];
  int size;
};
bool equal (const stuff& a, const stuff& b);



// Class File
// stuff.cpp

#include "stuff.h"
  
stuff::stuff() 
{
  size = 0;
}

bool equal  (const stuff& a, const stuff& b)
{
/* 
Where I cannot figure out how to compare the two objects for equality due to private fields in the header 
*/
}