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// Print some stats.

Console.WriteLine("Value of myInt {0}", myInt);

Console.WriteLine("Address of myInt {0:X}", (int)&ptrToMyInt);

}

An Unsafe (and Safe) Swap Function

Of course, declaring pointers to local variables simply to assign their value (as shown in the previ-

ous example) is never required and not altogether useful. To illustrate a more practical example of

unsafe code, assume you wish to build a swap function using pointer arithmetic:

unsafe public static void UnsafeSwap(int* i, int* j)

{

int temp = *i;

*i = *j;

*j = temp;

}

Very C-like, don’t you think? However, given your work in Chapter 4 you should be aware that

you could write the following safe version of your swap algorithm using the C# ref keyword:

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

407

8849CH12.qxd  9/26/07  11:31 AM  Page 407

---

public static void SafeSwap(ref int i, ref int j)

{

int temp = i;

i = j;

j = temp;

}

The functionality of each method is identical, thus reinforcing the point that direct pointer

manipulation is not a mandatory task under C#. Here is the calling logic using a safe Main(), with

an unsafe context:

static void Main(string[] args)

{

Console.WriteLine("***** Calling method with unsafe code *****");