From af32cdb2849e33d2a2b4874b1cc760dfa9c8d618 Mon Sep 17 00:00:00 2001
From: dellaert <dellaert@cc.gatech.edu>
Date: Tue, 20 Jan 2015 16:10:29 +0100
Subject: [PATCH] Added clone

---
 gtsam/nonlinear/ExpressionFactor.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/gtsam/nonlinear/ExpressionFactor.h b/gtsam/nonlinear/ExpressionFactor.h
index 4769e5048..9f843129a 100644
--- a/gtsam/nonlinear/ExpressionFactor.h
+++ b/gtsam/nonlinear/ExpressionFactor.h
@@ -106,6 +106,12 @@ public:
 
     return factor;
   }
+
+  /// @return a deep copy of this factor
+  virtual gtsam::NonlinearFactor::shared_ptr clone() const {
+    return boost::static_pointer_cast<gtsam::NonlinearFactor>(
+        gtsam::NonlinearFactor::shared_ptr(new ExpressionFactor(*this))); }
+
 };
 // ExpressionFactor