From 3bd448d1a88a21ccbcc99ef5a9499338a712bad6 Mon Sep 17 00:00:00 2001
From: Andreas Fabri <andreas.fabri@geometryfactory.com>
Date: Wed, 28 Feb 2024 14:28:00 +0000
Subject: [PATCH] Polygon: Avoid stackoverflow when summing exact numbers

---
 Polygon/include/CGAL/Polygon_2_algorithms.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Polygon/include/CGAL/Polygon_2_algorithms.h b/Polygon/include/CGAL/Polygon_2_algorithms.h
index 5c836466c11..dc8f9c8708f 100644
--- a/Polygon/include/CGAL/Polygon_2_algorithms.h
+++ b/Polygon/include/CGAL/Polygon_2_algorithms.h
@@ -24,6 +24,7 @@
 #include <CGAL/config.h>
 #include <CGAL/enum.h>
 #include <CGAL/Bbox_2.h>
+#include <CGAL/Lazy.h>
 #include <CGAL/Polygon_2/polygon_assertions.h>
 
 ///
@@ -153,6 +154,7 @@ area_2( ForwardIterator first, ForwardIterator last,
    ForwardIterator third = second;
    while (++third != last) {
         result = result + compute_area_2(*first, *second, *third);
+        exact(result);
         second = third;
    }
 }
@@ -190,6 +192,7 @@ polygon_area_2( ForwardIterator first, ForwardIterator last,
    ForwardIterator third = second;
    while (++third != last) {
         result = result + compute_area_2(*first, *second, *third);
+        exact(result);
         second = third;
    }
    return result;