when to use operator overloading in c++ code example

Example 1: c++ operator overloading

// money.h -- define the prototype
class Money
{
   public:
      Money & operator += (const Money &rhs);
}

// money.cpp -- define the implementation
Money& Money :: operator += (const Money &rhs)
{
   // Yadda Yadda
  
   return *this;
}

Example 2: Operator overloading in C++ Programming

#include <iostream>
using namespace std;

class Test
{
   private:
      int count;

   public:
       Test(): count(5){}

       void operator ++() 
       { 
          count = count+1; 
       }
       void Display() { cout<<"Count: "<<count; }
};

int main()
{
    Test t;
    // this calls "function void operator ++()" function
    ++t;    
    t.Display();
    return 0;
}

Example 3: operator ++ overloading c++

class Point
{
public:
	Point& operator++() { ... }		// prefix
	Point operator++(int) { ... }	// postfix
  	friend Point& operator++(Point &p);			// friend prefix
  	friend Point operator++(Point &p, int);		// friend postfix
  	// in Microsoft Docs written "friend Point& operator++(Point &p, int);"
};