Forward Declaration of Class, Function

Question

When forward declarations of functions work in a source file (.cpp), why would the same doesn\'t work for classes ?

Thanks.

// main.cpp

void forwar         


        

Answer 1

Place your member declaration of your class before the member implementations.

class One {

 public:
  void anyAccess() ;
  static int statVar ;

 private:
  int  classVar ;

} ;

int One:: statVar = 10 ;

void
One :: anyAccess() {

 std::cout << "\n statVar:\t " << statVar ;
 std::cout << "\n classVar:\t" << classVar ;
}