#ifndef ABSTRACT_H
#define ABSTRACT_H
///////////////////////////////////////////////////////////////////
//  abstract.h  -  abstract interface for product classes        //
//                                                               //
//  Demonstrates use of abstract interface and a static factory  //
//  method to isolate product classes from client code.          //
//                                                               //
//  Jim Fawcett, CSE687 - Object Oriented Design, Spring 2001    //
///////////////////////////////////////////////////////////////////

#include <iostream>
#include <string>

struct productAbstraction {

  virtual ~productAbstraction();
  virtual void hello() = 0;
  virtual std::string reply() = 0;
  virtual void request(const std::string &req) = 0;

  static  productAbstraction* createProduct();

private:
  static productAbstraction *pPA;
};

//----< destructor >---------------------------------------------------
//
//  needed so facade's destructor will be called,
//  since compiler generated destructor is not virtual
//
inline productAbstraction::~productAbstraction() {

  std::cout << "\n  interface destructor called";
}

#endif