From 22fcec43690025693634a7b5b50132995ab13df2 Mon Sep 17 00:00:00 2001
From: Varun Agrawal <varagrawal@gmail.com>
Date: Wed, 7 Apr 2021 16:36:57 -0400
Subject: [PATCH 1/2] change KeyFormatter from boost::function to std::function

---
 gtsam/inference/Key.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gtsam/inference/Key.h b/gtsam/inference/Key.h
index 8b13f0b4ca..1eb57d7fcf 100644
--- a/gtsam/inference/Key.h
+++ b/gtsam/inference/Key.h
@@ -26,13 +26,14 @@
 #include <gtsam/dllexport.h>
 
 #include <boost/function.hpp>
+#include <functional>
 
 #include <iosfwd>
 
 namespace gtsam {
 
 /// Typedef for a function to format a key, i.e. to convert it to a string
-typedef boost::function<std::string(Key)> KeyFormatter;
+typedef std::function<std::string(Key)> KeyFormatter;
 
 // Helper function for DefaultKeyFormatter
 GTSAM_EXPORT std::string _defaultKeyFormatter(Key key);

From 1d0c61b072edd3ba543cb2daba669f817ea8e17b Mon Sep 17 00:00:00 2001
From: Gerry Chen <gerry.chen2015@gmail.com>
Date: Thu, 8 Apr 2021 01:42:09 -0400
Subject: [PATCH 2/2] remove boost::function from Key.h

---
 gtsam/inference/Key.h           | 1 -
 gtsam/inference/LabeledSymbol.h | 1 +
 gtsam/inference/Symbol.h        | 1 +
 3 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/gtsam/inference/Key.h b/gtsam/inference/Key.h
index 1eb57d7fcf..2cc19d07a5 100644
--- a/gtsam/inference/Key.h
+++ b/gtsam/inference/Key.h
@@ -25,7 +25,6 @@
 #include <gtsam/base/types.h>
 #include <gtsam/dllexport.h>
 
-#include <boost/function.hpp>
 #include <functional>
 
 #include <iosfwd>
diff --git a/gtsam/inference/LabeledSymbol.h b/gtsam/inference/LabeledSymbol.h
index d46425bb48..15a2a25014 100644
--- a/gtsam/inference/LabeledSymbol.h
+++ b/gtsam/inference/LabeledSymbol.h
@@ -20,6 +20,7 @@
 #pragma once
 
 #include <gtsam/inference/Symbol.h>
+#include <boost/function.hpp>
 
 namespace gtsam {
 
diff --git a/gtsam/inference/Symbol.h b/gtsam/inference/Symbol.h
index d5699e7fed..89fb0d161e 100644
--- a/gtsam/inference/Symbol.h
+++ b/gtsam/inference/Symbol.h
@@ -21,6 +21,7 @@
 #include <gtsam/inference/Key.h>
 #include <gtsam/base/Testable.h>
 #include <boost/serialization/nvp.hpp>
+#include <boost/function.hpp>
 #include <cstdint>
 
 namespace gtsam {