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#include <iostream>
using namespace std;
 
//#include "B.h"
 
class B;
 
class A
{
  B b;
  // or
  void do_something(B b) { this.b = b; }
  // or
  B getB() const { return this.b; }
};
 
 
int main() {
	// your code goes here
	return 0;
}

prog.cpp:10:5: error: field ‘b’ has incomplete type ‘B’
   B b;
     ^
prog.cpp:6:7: note: forward declaration of ‘class B’
 class B;
       ^
prog.cpp: In member function ‘void A::do_something(B)’:
prog.cpp:12:23: error: ‘b’ has incomplete type
   void do_something(B b) { this.b = b; }
                       ^
prog.cpp:6:7: note: forward declaration of ‘class B’
 class B;
       ^
prog.cpp:12:33: error: request for member ‘b’ in ‘(A*)this’, which is of pointer type ‘A*’ (maybe you meant to use ‘->’ ?)
   void do_something(B b) { this.b = b; }
                                 ^
prog.cpp: In member function ‘B A::getB() const’:
prog.cpp:14:18: error: return type ‘class B’ is incomplete
   B getB() const { return this.b; }
                  ^
prog.cpp:14:32: error: request for member ‘b’ in ‘(const A*)this’, which is of pointer type ‘const A*’ (maybe you meant to use ‘->’ ?)
   B getB() const { return this.b; }
                                ^

Standard output is empty