From 84a44eeca14c3a1a4d2d79516845ced603dd77ac Mon Sep 17 00:00:00 2001
From: ShuangLiu1992 <ShuangLiu1992@users.noreply.github.com>
Date: Sat, 29 Apr 2023 22:12:13 +0100
Subject: [PATCH] Update HessianFactor.cpp

Fix JacobianFactor and HessianFactor on platforms where Eigen::Index is not the same size as gtsam::Key

Eigen::Index is defined as std::ptrdiff_t (size_t), which is not always the same size as gtsam::Key (uint64)
---
 gtsam/linear/HessianFactor.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gtsam/linear/HessianFactor.cpp b/gtsam/linear/HessianFactor.cpp
index 376509069..8980b5030 100644
--- a/gtsam/linear/HessianFactor.cpp
+++ b/gtsam/linear/HessianFactor.cpp
@@ -38,7 +38,7 @@ using namespace std;
 namespace gtsam {
 
 // Typedefs used in constructors below.
-using Dims = std::vector<Eigen::Index>;
+using Dims = std::vector<Key>;
 
 /* ************************************************************************* */
 void HessianFactor::Allocate(const Scatter& scatter) {