From 3d02c668da0765e91c351950338c7d5f91b985f5 Mon Sep 17 00:00:00 2001
From: Arjo Chakravarty <arjoc@google.com>
Date: Wed, 19 Jun 2024 10:13:43 +0800
Subject: [PATCH] Make cpplint happy

Signed-off-by: Arjo Chakravarty <arjoc@google.com>
---
 src/SystemContainer.hh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/SystemContainer.hh b/src/SystemContainer.hh
index 45ed26d231..8c66739415 100644
--- a/src/SystemContainer.hh
+++ b/src/SystemContainer.hh
@@ -20,6 +20,7 @@
 #include <iterator>
 #include <vector>
 #include <cstddef>
+#include <cstdint>
 #include <functional>
 
 #include "gz/sim/config.hh"
@@ -112,7 +113,7 @@ namespace gz
       public:
         using iterator_category = std::input_iterator_tag;
         using value_type = T;
-        using difference_type = long;
+        using difference_type = int64_t;
         using pointer = T*;
         using reference = T&;
         explicit Iterator(SystemContainer<T>* _parent, std::size_t _num = 0) :