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// Now let's overload the == and != operators



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[book] [en] Pro C# 2008 and the NET 3.5 Platform Fourth Edition

// Now let's overload the == and != operators.

public static bool operator ==(Point p1, Point p2)

{

return p1.Equals(p2); }



public static bool operator !=(Point p1, Point p2)

{

return !p1.Equals(p2); }



}

Notice how the implementation of operator == and operator != simply makes a call to the over-

ridden Equals() method to get the bulk of the work done. Given this, you can now exercise your

Point class as follows:



// Make use of the overloaded equality operators.

static void Main(string[] args)

{

...


Console.WriteLine("ptOne == ptTwo : {0}", ptOne == ptTwo);

Console.WriteLine("ptOne != ptTwo : {0}", ptOne != ptTwo);

Console.ReadLine();

}

As you can see, it is quite intuitive to compare two objects using the well-known == and !=



operators rather than making a call to Object.Equals(). If you do overload the equality operators

for a given class, keep in mind that C# demands that if you override the == operator, you must also

override the != operator (if you forget, the compiler will let you know).

C H A P T E R   1 2  



I N D E X E R S, O P E R ATO R S, A N D   P O I N T E R S



393

8849CH12.qxd  9/26/07  11:31 AM  Page 393





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