+#ifndef __GRAPHSORTING__
+#define __GRAPHSORTING__
+
+
+#include <set>
+#include "loop.hh"
+
+
+
+typedef set<Loop*> lset;
+typedef vector<Loop*> lvec;
+typedef vector<lset> lgraph;
+
+/**
+ * Topological sort of an acyclic graph of loops starting
+ * from its root. The loops are collect in an lgraph : a
+ * vector of sets of loops
+ */
+void sortGraph(Loop* root,lgraph& V);
+
+#endif