From d00971d2c9b43c0dc060551463353e9f2c849f73 Mon Sep 17 00:00:00 2001
From: Frank Dellaert <dellaert@gmail.com>
Date: Wed, 25 Jan 2023 22:59:22 -0800
Subject: [PATCH] Use boost::shared ptr

---
 gtsam/nonlinear/Values.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gtsam/nonlinear/Values.h b/gtsam/nonlinear/Values.h
index 48c9bd1ad9..74f22a27df 100644
--- a/gtsam/nonlinear/Values.h
+++ b/gtsam/nonlinear/Values.h
@@ -192,8 +192,8 @@ namespace gtsam {
       const_iterator_type it_;
       deref_iterator(const_iterator_type it) : it_(it) {}
       ConstKeyValuePair operator*() const { return {it_->first, *(it_->second)}; }
-      std::unique_ptr<ConstKeyValuePair> operator->() {
-        return std::make_unique<ConstKeyValuePair>(it_->first, *(it_->second));
+      boost::shared_ptr<ConstKeyValuePair> operator->() {
+        return boost::make_shared<ConstKeyValuePair>(it_->first, *(it_->second));
       }
       bool operator==(const deref_iterator& other) const {
         return it_ == other.it_;