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A More Elaborate Cloning Example

Now assume the Point class contains a reference type member variable of type PointDescription.

This class maintains a point’s friendly name as well as an identification number expressed as a

System.Guid (if you don’t come from a COM background, know that a globally unique identifier

[GUID] is a statistically unique 128-bit number). Here is the implementation:

// This class describes a point.

public class PointDescription

{

// Exposed publicly for simplicity.

public string petName;

public Guid pointID;

public PointDescription()

{

this.petName = "No-name";

pointID = Guid.NewGuid();

}

}

The initial updates to the Point class itself included modifying ToString() to account for these

new bits of state data, as well as defining and creating the PointDescription reference type. To allow

the outside world to establish a pet name for the Point, you also update the arguments passed into

the overloaded constructor:

public class Point : ICloneable

{

public int x, y;

public PointDescription desc = new PointDescription();

public Point(){}

public Point(int x, int y)

{

this.x = x; this.y = y;

}

public Point(int x, int y, string petname)

{

this.x = x;

this.y = y;

desc.petName = petname;

}

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