cherry-pick GeneralCompare

comments on GeneralCompare

src/sort/GeneralCompare.java

+package sort;
+
+public interface GeneralCompare<T> {
+	/**
+	 * Compare two Comparable elements based on an arbitrary ordering definition.
+	 * @param a1 The first value to be compared.
+	 * @param a2 The second value to be compared
+	 * @return Integer < 0 if a1 is less than a2, 0 if equal and > 0 if a1 is bigger than a2
+	 */
+	public int compare(Comparable<T> a1, Comparable<T> a2);
+}