From b42bbded9beb82800d79f4d5eda74223ecc8ec59 Mon Sep 17 00:00:00 2001
From: Giles Bathgate <giles.bathgate@gmail.com>
Date: Wed, 5 May 2021 06:46:57 +0100
Subject: [PATCH] Add null comparison operators to vector_iterator

---
 STL_Extension/include/CGAL/vector.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/STL_Extension/include/CGAL/vector.h b/STL_Extension/include/CGAL/vector.h
index e4c1a5bca28..c10a8fdd53a 100644
--- a/STL_Extension/include/CGAL/vector.h
+++ b/STL_Extension/include/CGAL/vector.h
@@ -109,6 +109,8 @@ public:
         tmp += n;
         return tmp.operator*();
     }
+    bool operator==( std::nullptr_t) const { return ptr == nullptr; }
+    bool operator!=( std::nullptr_t) const { return ptr != nullptr; }
     bool operator< ( const Self& i) const { return ( ptr < i.ptr); }
     bool operator> ( const Self& i) const { return i < *this;    }
     bool operator<=( const Self& i) const { return !(i < *this); }