From efde6199972185fe011cb19483c13b6b714a699e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ion=20Gazta=C3=B1aga?= <igaztanaga@gmail.com>
Date: Mon, 12 Dec 2022 00:43:49 +0100
Subject: [PATCH] Use remove_const to correctly extract key_type from
 value_type, as the typical case is pair<const KeyType, MappedType>

---
 include/boost/container/detail/tree.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/boost/container/detail/tree.hpp b/include/boost/container/detail/tree.hpp
index 7f26e1f..af6adca 100644
--- a/include/boost/container/detail/tree.hpp
+++ b/include/boost/container/detail/tree.hpp
@@ -425,7 +425,8 @@ class tree
 
    public:
 
-   typedef typename key_of_value_t::type                    key_type;
+   typedef typename dtl::remove_const
+      <typename key_of_value_t::type>::type                 key_type;
    typedef T                                                value_type;
    typedef Compare                                          key_compare;
    typedef ValComp                                          value_compare;