///////////////////////////////////////////////////////////////
//  clone.cpp - defines cloning                              //
//  Exam1:Q3                                                 //
//  Jim Fawcett, CSE687 - Object Oriented Design, Spring 05  //
///////////////////////////////////////////////////////////////

#include <string>
#include <iostream>

template <typename T, typename U>
class clonable : public T
{
public:
  clonable() {}
  clonable(const T& t) : T(t) {}
  virtual ~clonable() {}
  virtual U* clone() = 0;
};

class cloningString;
typedef clonable<std::string,cloningString> strClonable;

class cloningString : public strClonable
{
public:
  cloningString(const std::string& s="") : strClonable(s) {}
  virtual cloningString* clone() { return new cloningString(*this); }
};

void main()
{
  cloningString s = "this is a cloning string";
  std::cout << "\n  " << s.c_str()
            << "\n  size of string is: " << s.size() << " bytes\n";

  strClonable* pClone = s.clone();
  std::cout << "\n  " << pClone->c_str()
            << "\n  size of clone is: " << pClone->size() << " bytes\n";
  delete pClone;

  std::cout << "\n\n";
}