From 6cd28f751ed670181c76660623e1e5d6185ce2e0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Loriot?= <sebastien.loriot@cgal.org>
Date: Thu, 23 Nov 2023 09:39:17 +0100
Subject: [PATCH] use std integral_constant

---
 STL_Extension/include/CGAL/tags.h | 15 +--------------
 1 file changed, 1 insertion(+), 14 deletions(-)

diff --git a/STL_Extension/include/CGAL/tags.h b/STL_Extension/include/CGAL/tags.h
index 6aa1988e1cc..eba9ffdc721 100644
--- a/STL_Extension/include/CGAL/tags.h
+++ b/STL_Extension/include/CGAL/tags.h
@@ -19,26 +19,13 @@
 #define CGAL_TAGS_H
 
 #include <CGAL/IO/io_tags.h>
-#include <boost/mpl/integral_c.hpp>
 
 namespace CGAL {
 
 struct Void {};
 
-// Boolean_tag<bool> is a model of the Boost Integral Constant concept.
-// https://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html
 template <bool b>
-struct Boolean_tag {
-  typedef boost::mpl::integral_c_tag tag;
-  typedef bool value_type;
-  static const bool value = b;
-  typedef Boolean_tag<b> type;
-  operator bool() const { return this->value; }
-};
-/* In C++11, try:
-template <bool b>
-using Boolean_tag = std::integral_constant<bool, b>;
-*/
+using Boolean_tag = std::bool_constant<b>;
 
 typedef Boolean_tag<true>   Tag_true;
 typedef Boolean_tag<false>  Tag_false;