Unsafe code: copy : Pointer Unsafe « Language Basics « C# / C Sharp

1. C# / C Sharp
2. Language Basics
3. Pointer Unsafe

Unsafe code: copy

/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa

Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
namespace nsType
{
    using System;
    
    public class IntCopy
    {
        public static void Main ()
        {
            int [] arr1 = new int[] {1, 4, 2, 8, 5, 7};
            int [] arr2 = new int[arr1.Length];
            MemCpy (arr2, arr1, arr1.Length);
            arr1[0] = 142857;
            for (int x = 0; x < arr1.Length; ++x)
            {
                Console.Write ("arr1[{0}] = {1}\t", x, arr1[x]);
                Console.Write ("arr2[{0}] = {1}\n", x, arr2[x]);
            }
        }

        static unsafe public void MemCpy (int [] dst, int [] src, int size)
        {
            if ((size > dst.Length) || (size > src.Length))
            {
                ArgumentException e = new ArgumentException("The size argument is too large for one of the array arguments");
                throw (e);
            }
            fixed (int *Src = src, Dst = dst)
            {
                int* pSrc = Src;
                int* pDst = Dst;
                for (int n = 0; n < size; ++n)
                {
                    *pDst++ = *pSrc++;
                }
            }
        }
    }
}


           
       

Related examples in the same category

1.	References and Pointers
2.	Demonstrate pointers and unsafe
3.	Demonstrate fixed
4.	Demonstrate the effects of pointer arithmethic
5.	Demonstrate pointer comparison
6.	An array name with an index yields a pointer to the start of the array
7.	Index a pointer as if it were an array
8.	Use fixed to get a pointer to the start of a string
9.	Multiple Indirect
10.	Pointers and Declarative Pinning
11.	Unsafe Context