Add clear() to the StateVector interface

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@8407 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/explicit/StateValues.java

@@ -1263,12 +1263,10 @@ public class StateValues implements StateVector
 
 	// ...
 
-	/**
-	 * Clear the vector, i.e. free any used memory.
-	 * (Well, actually, just set pointer to null and wait for later garbage collection.)
-	 */
+	@Override
 	public void clear()
 	{
+		// Actually, just set pointers to null and wait for later garbage collection.
 		valuesI = null;
 		valuesD = null;
 		valuesB = null;

prism/src/prism/StateValuesDV.java

@@ -215,8 +215,7 @@ public class StateValuesDV implements StateValues
 		values.maxMTBDD(vec2, vars, odd);
 	}
 
-	// clear (free memory)
-
+	@Override
 	public void clear()
 	{
 		values.clear();

prism/src/prism/StateValuesMTBDD.java

@@ -237,8 +237,7 @@ public class StateValuesMTBDD implements StateValues
 		values = JDD.Apply(JDD.MAX, values, vec2);
 	}
 	
-	// clear
-	
+	@Override
 	public void clear()
 	{
 		JDD.Deref(values);

prism/src/prism/StateValuesVoid.java

@@ -117,6 +117,7 @@ public class StateValuesVoid implements StateValues
 		throw new UnsupportedOperationException();
 	}
 	
+	@Override
 	public void clear()
 	{
 		// Do nothing

prism/src/prism/StateVector.java

@@ -40,4 +40,9 @@ public interface StateVector
 	 * Get the value of the ith element of the vector, as an Object.
 	 */
 	public Object getValue(int i);
+	
+	/**
+	 * Clear the vector, i.e. free any used memory.
+	 */
+	public void clear();
 }