--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/dwthelper/System.d	Tue Jan 08 01:23:25 2008 +0100
@@ -0,0 +1,118 @@
+module dwt.dwthelper.System;
+
+import tango.core.Exception;
+
+template SimpleType(T) {
+    debug{
+        static void validCheck(uint SrcLen, uint DestLen, uint copyLen){
+            if(SrcLen < copyLen || DestLen < copyLen|| SrcLen < 0 || DestLen < 0){
+                Util.trace("Error : SimpleType.arraycopy(), out of bounds.");
+                assert(0);
+            }
+        }
+    }
+
+    static void remove(inout T[] items, int index) {
+        if(items.length == 0)
+            return;
+
+        if(index < 0 || index >= items.length){
+            throw new ArrayBoundsException(__FILE__, __LINE__);
+        }
+
+        T element = items[index];
+
+        int length = items.length;
+        if(length == 1){
+            items.length = 0;
+            return;// element;
+        }
+
+        if(index == 0)
+            items = items[1 .. $];
+        else if(index == length - 1)
+            items = items[0 .. index];
+        else
+            items = items[0 .. index] ~ items[index + 1 .. $];
+    }
+
+    static void insert(inout T[] items, T item, int index = -1) {
+        if(index == -1)
+            index = items.length;
+
+        if(index < 0 || index > items.length ){
+            throw new ArrayBoundsException(__FILE__, __LINE__);
+        }
+
+        if(index == items.length){
+            items ~= item;
+        }else if(index == 0){
+            T[] newVect;
+            newVect ~= item;
+            items = newVect ~ items;
+        }else if(index < items.length ){
+            T[] arr1 = items[0 .. index];
+            T[] arr2 = items[index .. $];
+
+            // Important : if you write like the following commented,
+            // you get wrong data
+            // code:  T[] arr1 = items[0..index];
+            //        T[] arr2 = items[index..$];
+            //        items = arr1 ~ item;      // error, !!!
+            //        items ~= arr2;            // item replace the arrr2[0] here
+            items = arr1 ~ item ~ arr2;
+        }
+    }
+
+    static void arraycopy(T[] src, uint srcPos, T[] dest, uint destPos, uint len)
+    {
+        if(len == 0) return;
+
+        assert(src);
+        assert(dest);
+        debug{validCheck(src.length - srcPos, dest.length - destPos, len);}
+
+        if(src is dest){
+            for(int i=0; i<len; ++i){
+                dest[destPos+i] = src[srcPos+i];
+            }
+        }else{
+            dest[destPos..(len+destPos)] = src[srcPos..(len+srcPos)];
+        }
+    }
+}
+
+
+class System {
+
+    alias SimpleType!(int).arraycopy arraycopy;
+    alias SimpleType!(byte).arraycopy arraycopy;
+    alias SimpleType!(double).arraycopy arraycopy;
+    alias SimpleType!(float).arraycopy arraycopy;
+    alias SimpleType!(short).arraycopy arraycopy;
+    alias SimpleType!(long).arraycopy arraycopy;
+    alias SimpleType!(uint).arraycopy arraycopy;
+    alias SimpleType!(ushort).arraycopy arraycopy;
+    alias SimpleType!(ubyte).arraycopy arraycopy;
+    alias SimpleType!(ulong).arraycopy arraycopy;
+    alias SimpleType!(char).arraycopy arraycopy;
+    alias SimpleType!(wchar).arraycopy arraycopy;
+    alias SimpleType!(Object).arraycopy arraycopy;
+    alias SimpleType!(void*).arraycopy arraycopy;
+
+    alias SimpleType!(int[]).arraycopy arraycopy;
+    alias SimpleType!(byte[]).arraycopy arraycopy;
+    alias SimpleType!(double[]).arraycopy arraycopy;
+    alias SimpleType!(float[]).arraycopy arraycopy;
+    alias SimpleType!(short[]).arraycopy arraycopy;
+    alias SimpleType!(long[]).arraycopy arraycopy;
+    alias SimpleType!(uint[]).arraycopy arraycopy;
+    alias SimpleType!(ushort[]).arraycopy arraycopy;
+    alias SimpleType!(ubyte[]).arraycopy arraycopy;
+    alias SimpleType!(ulong[]).arraycopy arraycopy;
+    alias SimpleType!(char[]).arraycopy arraycopy;
+    alias SimpleType!(wchar[]).arraycopy arraycopy;
+    alias SimpleType!(Object[]).arraycopy arraycopy;
+    alias SimpleType!(void*[]).arraycopy arraycopy;
+}
+