1 files changed, 52 insertions, 0 deletions
diff --git a/src/expr/attribute_unique_id.h b/src/expr/attribute_unique_id.h
new file mode 100644
index 000000000..79c6bfd8f
--- /dev/null
+++ b/src/expr/attribute_unique_id.h
@@ -0,0 +1,52 @@
+
+#pragma once
+
+#include "cvc4_private.h"
+#include <stdint.h>
+
+// ATTRIBUTE IDs ============================================================
+
+namespace CVC4 {
+namespace expr {
+namespace attr {
+
+/** A unique id for each attribute table. */
+enum AttrTableId {
+  AttrTableBool,
+  AttrTableUInt64,
+  AttrTableTNode,
+  AttrTableNode,
+  AttrTableTypeNode,
+  AttrTableString,
+  AttrTablePointer,
+  AttrTableCDBool,
+  AttrTableCDUInt64,
+  AttrTableCDTNode,
+  AttrTableCDNode,
+  AttrTableCDString,
+  AttrTableCDPointer,
+  LastAttrTable
+};
+
+/**
+ * This uniquely indentifies attributes across tables.
+ */
+class AttributeUniqueId {
+  AttrTableId d_tableId;
+  uint64_t d_withinTypeId;
+
+public:
+  AttributeUniqueId() : d_tableId(LastAttrTable), d_withinTypeId(0){}
+
+  AttributeUniqueId(AttrTableId tableId, uint64_t within)
+    : d_tableId(tableId), d_withinTypeId(within)
+  {}
+
+  AttrTableId getTableId() const{ return d_tableId; }
+  uint64_t getWithinTypeId() const{ return d_withinTypeId; }
+
+};/* CVC4::expr::attr::AttributeUniqueId */
+
+}/* CVC4::expr::attr namespace */
+}/* CVC4::expr namespace */
+}/* CVC4 namespace */