From cc2df45fc05f7db65fb7e3ca1ace1d654d7247b4 Mon Sep 17 00:00:00 2001
From: "Martin D. Weinberg" <weinberg@astro.umass.edu>
Date: Fri, 29 Sep 2023 14:57:20 -0400
Subject: [PATCH] Implementation of std::advance with endpoint checking

---
 coefs/expMSSA.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/coefs/expMSSA.cc b/coefs/expMSSA.cc
index 60294c141..77d80985c 100644
--- a/coefs/expMSSA.cc
+++ b/coefs/expMSSA.cc
@@ -415,7 +415,7 @@ namespace MSSA {
 	size_t map_size  = mean.size();
 
 	auto u = mean.begin();
-	std::advance(u, thread_num);
+	for (int i=0; i<thread_num and u!=mean.end(); i++) u++;
 
 	for (int q=thread_num; q<map_size; q+=thread_count) {