From 6f5c0edd5a68c8a0783f260f9800415f7ebc8df3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Loriot?= <sebastien.loriot@cgal.org>
Date: Tue, 19 Oct 2021 15:05:22 +0200
Subject: [PATCH] remove c++17 deprecation warning

---
 .../sibson_interpolation_vertex_with_info_2.cpp            | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Interpolation/examples/Interpolation/sibson_interpolation_vertex_with_info_2.cpp b/Interpolation/examples/Interpolation/sibson_interpolation_vertex_with_info_2.cpp
index 8e74eab6aa1..ade979afc8e 100644
--- a/Interpolation/examples/Interpolation/sibson_interpolation_vertex_with_info_2.cpp
+++ b/Interpolation/examples/Interpolation/sibson_interpolation_vertex_with_info_2.cpp
@@ -50,8 +50,13 @@ struct Value_function
 
 template <typename V, typename G>
 struct Gradient_function
-  : public std::iterator<std::output_iterator_tag, void, void, void, void>
 {
+  typedef void value_type;
+  typedef void Distance;
+  typedef void Pointer;
+  typedef void Reference;
+  typedef std::output_iterator_tag category;
+
   typedef V                                                argument_type;
   typedef std::pair<G, bool>                               result_type;