A snippet detailing how a class may have a reference member

reference_member.cc

#include <iostream>

using namespace std;

class B {
  public:
  B() {x = 0;}
  ~B() {;}
  
  int x;
  void incr() {x++;}
    
};

class A {
  public:
  A () : refB(*new B()) {;}
  A(B& b) : refB(b) {;}
  
    
    const B& refB;
};
int main()
{
  B bb;
  A aa(bb);
  // aa.refB.incr(); //error
  
  A aaa;
   
   return 0;
}