Maha

Maha

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NP95 shallow copy/deep copy

Apr 18 2008 6:21 AM

Hi Guys

 

NP95 shallow copy/deep copy

 

If

p3:  X: 100 Y: 100

p4:  X: 100 Y: 100

I mean this is shallow copy

 

If

p3:  X: 100 Y: 100

p4:  X: 0 Y: 100

I mean this is deep copy

 

That means if p3 is independent of p4 it is a deep copy

 

In this program MemberwiseClone() is producing deep copy.

 

I wish to know whether my understanding is correct.

 

Please explain.

 

Thank you

 

using System;

 

// The Point class supports deep copy semantics a la ICloneable.

public class Point : ICloneable

{

   public int x, y;

 

   public Point(int x, int y)

   {

      this.x = x;

      this.y = y;

   }

 

   // Return a copy of the current object.

  

   public object Clone()

   {

      // Copy each field of the Point member by member.

      return this.MemberwiseClone();

   }

  

 

   public override string ToString()

   {

      return "X: " + x + " Y: " + y;

   }

}

 

public class CloneDemo

{

   public static void Main()

   {

      // Notice Clone() returns a generic object type.

      // You must perform an explicit cast to obtain the derived type.

      Point p3 = new Point(100, 100);

 

      Point p4 = (Point)p3.Clone();

 

      // Change p4.x (which will not change p3.x).

      p4.x = 0;

 

      // Print each object.

      Console.WriteLine("p3:  {0}", p3);

      Console.WriteLine("p4:  {0}", p4);

   }

}

/*

p3:  X: 100 Y: 100

p4:  X: 0 Y: 100

*/

 


Answers (6)