1 files changed, 9 insertions, 0 deletions
diff --git a/decoder/hg_union.h b/decoder/hg_union.h
new file mode 100644
index 00000000..34624246
--- /dev/null
+++ b/decoder/hg_union.h
@@ -0,0 +1,9 @@
+#ifndef _HG_UNION_H_
+#define _HG_UNION_H_
+
+class Hypergraph;
+namespace HG {
+  void Union(const Hypergraph& in, Hypergraph* out);
+};
+
+#endif