From 3238c59a39b423f8b2365a729b2495497e02a821 Mon Sep 17 00:00:00 2001
From: dellaert <dellaert@cc.gatech.edu>
Date: Fri, 12 Dec 2014 13:56:50 +0100
Subject: [PATCH] Fixed printing

---
 gtsam/nonlinear/Expression-inl.h | 6 ++++--
 gtsam/nonlinear/Expression.h     | 2 +-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/gtsam/nonlinear/Expression-inl.h b/gtsam/nonlinear/Expression-inl.h
index c5a4aaeaa..6c8561650 100644
--- a/gtsam/nonlinear/Expression-inl.h
+++ b/gtsam/nonlinear/Expression-inl.h
@@ -251,8 +251,10 @@ public:
   /// Streaming
   GTSAM_EXPORT friend std::ostream &operator<<(std::ostream &os,
       const ExpressionNode& node) {
-    os << "Expression of type " << typeid(int).name() << std::endl;
-    if (node.traceSize_>0) os << node.traceSize_ << std::endl;
+    os << "Expression of type " << typeid(T).name();
+    if (node.traceSize_>0) os << ", trace size = " << node.traceSize_;
+    os << "\n";
+    return os;
   }
 
   /// Return keys that play in this expression as a set
diff --git a/gtsam/nonlinear/Expression.h b/gtsam/nonlinear/Expression.h
index 0bd07b97d..6b68c7de2 100644
--- a/gtsam/nonlinear/Expression.h
+++ b/gtsam/nonlinear/Expression.h
@@ -54,7 +54,7 @@ public:
 
   /// Print
   void print(const std::string& s) const {
-    std::cout << s << root_ << std::endl;
+    std::cout << s << *root_ << std::endl;
   }
 
   // Construct a constant expression