Merge pull request #391 from rkraneis/rk-valhalla-examples

Add simple Cursor variant of the DoesItVectorise example

Author: chriswhocodes

core/src/main/resources/examples/DoesItVectoriseValue.java

@@ -0,0 +1,57 @@
+public class DoesItVectoriseValue
+{
+    public DoesItVectoriseValue()
+    {
+        int[] array = new int[1024];
+
+        for (int i = 0; i < 1_000_000; i++)
+        {
+            incrementArray(array, 1);
+        }
+
+        for (int i = 0; i < array.length; i++)
+        {
+            System.out.println(array[i]);
+        }
+    }
+
+    public void incrementArray(int[] array, int constant)
+    {
+        int length = array.length;
+
+        for (Cursor c = Cursor.of(length); c.canAdvance(); c = c.advance())
+        {
+            array[c.position] += constant;
+        }
+    }
+
+    public value record Cursor(int position, int length)
+    {
+        public Cursor {
+            if (length < 0 || position > length)
+            {
+                throw new IllegalArgumentException();
+            }
+        }
+
+        public static Cursor of(int length)
+        {
+            return new Cursor(0, length);
+        }
+
+        public boolean canAdvance()
+        {
+            return position < length;
+        }
+
+        public Cursor advance()
+        {
+            return new Cursor(position + 1, length);
+        }
+    }
+
+    public static void main(String[] args)
+    {
+        new DoesItVectoriseValue();
+    }
+}