JDD.Constant detects +/- infinity.

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@1659 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/jdd/JDD.java

@@ -271,7 +271,10 @@ public class JDD
 
 	public static JDDNode Constant(double value)
 	{
-		return new JDDNode(DD_Constant(value));
+		if (Double.isInfinite(value))
+			return value > 0 ? JDD.PlusInfinity() : JDD.MinusInfinity();
+		else
+			return new JDDNode(DD_Constant(value));
 	}
 		
 	// create new constant (plus infinity)