From 4e481ea1e111cd08ff0222f86c2ad2447da0fbd7 Mon Sep 17 00:00:00 2001
From: Fan Jiang <prof.fan@foxmail.com>
Date: Tue, 10 May 2022 17:45:50 -0700
Subject: [PATCH] Fix the enable_if_t absence

---
 gtsam/hybrid/HybridBayesTree.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gtsam/hybrid/HybridBayesTree.h b/gtsam/hybrid/HybridBayesTree.h
index dd8b7f022..626f2b10c 100644
--- a/gtsam/hybrid/HybridBayesTree.h
+++ b/gtsam/hybrid/HybridBayesTree.h
@@ -74,7 +74,7 @@ class GTSAM_EXPORT HybridBayesTree : public BayesTree<HybridBayesTreeClique> {
 template <class CLIQUE>
 class BayesTreeOrphanWrapper<
     CLIQUE,
-    boost::enable_if_t<boost::is_same<CLIQUE, HybridBayesTreeClique>::value> >
+    typename std::enable_if<boost::is_same<CLIQUE, HybridBayesTreeClique>::value> >
     : public CLIQUE::ConditionalType {
  public:
   typedef CLIQUE CliqueType;