+class AutoTuner;
+class SearchTuner;
+class TunableSetting;
+
+class TunableDesc;
+
+class OrderResolver;
+class DecomposeOrderResolver;
+
+struct IncrementalSolver;
+typedef struct IncrementalSolver IncrementalSolver;
+struct TableEntry;
+typedef struct TableEntry TableEntry;
+typedef int TunableParam;