#include <iostream>
using namespace std ;

inline int x1 ;

class A
{
	public:
	  A() : id{count++}
	  {

	  }
	  ~A() { }
	  int id  ;
	  static inline int count{0} ;
	  // declare and initialize count to 0 within the class
	  //Pre C++ 17
	  static  int count1 ;
};

int A::count1 = 0 ;

int main()
{
   A obj1 ;
   cout << "obj1.id:" <<  obj1.id << endl ;
   A obj2 ;
   cout << "obj2.id:" <<  obj2.id << endl ;

}