// ==========================================================================
// $Id: uniqueptr.cpp,v 1.1 2013/11/24 22:50:25 jlang Exp $
// CSI2372 example Code for lecture 13
// ==========================================================================
// (C)opyright:
//
//   Jochen Lang
//   EECS, University of Ottawa
//   800 King Edward Ave.
//   Ottawa, On., K1N 6N5
//   Canada. 
//   http://www.site.uottawa.ca
// 
// Creator: jlang (Jochen Lang)
// Email:   jlang@site.uottawa.ca
// ==========================================================================
// $Log: uniqueptr.cpp,v $
// Revision 1.1  2013/11/24 22:50:25  jlang
// Added examples on weak and unique ptr.
//
// ==========================================================================
#include <iostream>
#include <memory> 

using std::endl;
using std::cout;
using std::auto_ptr;
using std::ostream;

class A {
  int d_a;
public:
  A( int _a = 0) : d_a(_a) {
    cout << "A(" << _a << ")" << endl;
  }
  A operator++ (int) {
    A res(*this); ++(*this); return res; 
  }
  A& operator++ () {
    ++d_a; return *this; 
  }
  int getValue() {
	  return d_a;
  }
  friend ostream& operator<<(ostream& os, const A& _obj ) {
    os << "A: " << _obj.d_a;
    return os;
  }
};


int main() {
	std::unique_ptr<A> aPtr(new A(3));
	// calling a function on A
	cout << "Value: " << aPtr->getValue() << endl;
	// derefencing to get A 
	++(*aPtr);
	cout << *aPtr << endl; 

	std::unique_ptr<A> aPtr2; // aPtr2 is a nullptr
	// Now transfer ownership
	aPtr2.reset(aPtr.release());
	cout << "aPtr: " << aPtr.get() << endl;
	cout << *aPtr2 << endl;
	aPtr2.release();
	cout << "aPtr2: " << aPtr2.get() << endl;
	return 0;
}