From 873dec04035b80b7123858cd03bfa8de56e04f19 Mon Sep 17 00:00:00 2001
From: Fan Jiang <prof.fan@foxmail.com>
Date: Wed, 4 Dec 2019 15:53:57 -0500
Subject: [PATCH] Workaround for upstream boost issue #119

---
 gtsam/inference/BayesTreeCliqueBase.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gtsam/inference/BayesTreeCliqueBase.h b/gtsam/inference/BayesTreeCliqueBase.h
index 317ba1c442..cd8157a262 100644
--- a/gtsam/inference/BayesTreeCliqueBase.h
+++ b/gtsam/inference/BayesTreeCliqueBase.h
@@ -166,7 +166,9 @@ namespace gtsam {
     template<class ARCHIVE>
     void serialize(ARCHIVE & ar, const unsigned int /*version*/) {
       ar & BOOST_SERIALIZATION_NVP(conditional_);
-      ar & BOOST_SERIALIZATION_NVP(parent_);
+      if (parent_) { // TODO(fan): Workaround for boost/serialization #119
+        ar & BOOST_SERIALIZATION_NVP(parent_);
+      }
       ar & BOOST_SERIALIZATION_NVP(children);
     }