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+/* Copyright 2003-2013 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See http://www.boost.org/libs/multi_index for library home page.
+ */
+
+#ifndef BOOST_MULTI_INDEX_DETAIL_MODIFY_KEY_ADAPTOR_HPP
+#define BOOST_MULTI_INDEX_DETAIL_MODIFY_KEY_ADAPTOR_HPP
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+namespace boost{
+
+namespace multi_index{
+
+namespace detail{
+
+/* Functional adaptor to resolve modify_key as a call to modify.
+ * Preferred over compose_f_gx and stuff cause it eliminates problems
+ * with references to references, dealing with function pointers, etc.
+ */
+
+template<typename Fun,typename Value,typename KeyFromValue>
+struct modify_key_adaptor
+{
+
+  modify_key_adaptor(Fun f_,KeyFromValue kfv_):f(f_),kfv(kfv_){}
+
+  void operator()(Value& x)
+  {
+    f(kfv(x));
+  }
+
+private:
+  Fun          f;
+  KeyFromValue kfv;
+};
+
+} /* namespace multi_index::detail */
+
+} /* namespace multi_index */
+
+} /* namespace boost */
+
+#endif