diff --git a/include/boost/unordered/concurrent_flat_map.hpp b/include/boost/unordered/concurrent_flat_map.hpp
index 2bea917e..40c2fcae 100644
--- a/include/boost/unordered/concurrent_flat_map.hpp
+++ b/include/boost/unordered/concurrent_flat_map.hpp
@@ -362,18 +362,20 @@ namespace boost {
         return table_.emplace(std::forward<Args>(args)...);
       }
 
-      template <class F, class... Args>
-      bool emplace_or_visit(F f, Args&&... args)
+      template <class Arg, class... Args>
+      bool emplace_or_visit(Arg&& arg, Args&&... args)
       {
-        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
-        return table_.emplace_or_visit(f, std::forward<Args>(args)...);
+        //BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
+        return table_.emplace_or_visit(
+          std::forward<Arg>(arg), std::forward<Args>(args)...);
       }
 
-      template <class F, class... Args>
-      bool emplace_or_cvisit(F f, Args&&... args)
+      template <class Arg, class... Args>
+      bool emplace_or_cvisit(Arg&& arg, Args&&... args)
       {
-        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
-        return table_.emplace_or_cvisit(f, std::forward<Args>(args)...);
+        //BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.emplace_or_cvisit(
+          std::forward<Arg>(arg), std::forward<Args>(args)...);
       }
 
       template <class... Args>
@@ -396,50 +398,52 @@ namespace boost {
           std::forward<K>(k), std::forward<Args>(args)...);
       }
 
-      template <class F, class... Args>
-      bool try_emplace_or_visit(key_type const& k, F f, Args&&... args)
+      template <class Arg, class... Args>
+      bool try_emplace_or_visit(key_type const& k, Arg&& arg, Args&&... args)
       {
-        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
-        return table_.try_emplace_or_visit(k, f, std::forward<Args>(args)...);
-      }
-
-      template <class F, class... Args>
-      bool try_emplace_or_cvisit(key_type const& k, F f, Args&&... args)
-      {
-        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
-        return table_.try_emplace_or_cvisit(k, f, std::forward<Args>(args)...);
-      }
-
-      template <class F, class... Args>
-      bool try_emplace_or_visit(key_type&& k, F f, Args&&... args)
-      {
-        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
+        //BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
         return table_.try_emplace_or_visit(
-          std::move(k), f, std::forward<Args>(args)...);
+          k, std::forward<Arg>(arg), std::forward<Args>(args)...);
       }
 
-      template <class F, class... Args>
-      bool try_emplace_or_cvisit(key_type&& k, F f, Args&&... args)
+      template <class Arg, class... Args>
+      bool try_emplace_or_cvisit(key_type const& k, Arg&& arg, Args&&... args)
       {
-        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        //BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
         return table_.try_emplace_or_cvisit(
-          std::move(k), f, std::forward<Args>(args)...);
+          k, std::forward<Arg>(arg), std::forward<Args>(args)...);
       }
 
-      template <class K, class F, class... Args>
-      bool try_emplace_or_visit(K&& k, F f, Args&&... args)
+      template <class Arg, class... Args>
+      bool try_emplace_or_visit(key_type&& k, Arg&& arg, Args&&... args)
       {
-        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
+        //BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
         return table_.try_emplace_or_visit(
-          std::forward<K>(k), f, std::forward<Args>(args)...);
+          std::move(k), std::forward<Arg>(arg), std::forward<Args>(args)...);
       }
 
-      template <class K, class F, class... Args>
-      bool try_emplace_or_cvisit(K&& k, F f, Args&&... args)
+      template <class Arg, class... Args>
+      bool try_emplace_or_cvisit(key_type&& k, Arg&& arg, Args&&... args)
       {
-        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        //BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
         return table_.try_emplace_or_cvisit(
-          std::forward<K>(k), f, std::forward<Args>(args)...);
+          std::move(k), std::forward<Arg>(arg), std::forward<Args>(args)...);
+      }
+
+      template <class K, class Arg, class... Args>
+      bool try_emplace_or_visit(K&& k, Arg&& arg, Args&&... args)
+      {
+        //BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
+        return table_.try_emplace_or_visit(
+          std::forward<K>(k), std::forward<Arg>(arg), std::forward<Args>(args)...);
+      }
+
+      template <class K, class Arg, class... Args>
+      bool try_emplace_or_cvisit(K&& k, Arg&& arg, Args&&... args)
+      {
+        //BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.try_emplace_or_cvisit(
+          std::forward<K>(k), std::forward<Arg>(arg), std::forward<Args>(args)...);
       }
 
       size_type erase(key_type const& k) { return table_.erase(k); }
diff --git a/include/boost/unordered/detail/foa/concurrent_table.hpp b/include/boost/unordered/detail/foa/concurrent_table.hpp
index 2461bbad..4517ae5c 100644
--- a/include/boost/unordered/detail/foa/concurrent_table.hpp
+++ b/include/boost/unordered/detail/foa/concurrent_table.hpp
@@ -17,13 +17,16 @@
 #include <boost/config.hpp>
 #include <boost/core/no_exceptions_support.hpp>
 #include <boost/cstdint.hpp>
+#include <boost/mp11/tuple.hpp>
 #include <boost/unordered/detail/foa/core.hpp>
 #include <boost/unordered/detail/foa/rw_spinlock.hpp>
+#include <boost/unordered/detail/foa/tuple_rotate_right.hpp>
 #include <cstddef>
 #include <functional>
 #include <memory>
 #include <new>
 #include <type_traits>
+#include <tuple>
 #include <utility>
 
 #if !defined(BOOST_UNORDERED_DISABLE_PARALLEL_ALGORITHMS)
@@ -445,34 +448,34 @@ public:
       try_emplace_args_t{},std::forward<Key>(x),std::forward<Args>(args)...);
   }
 
-  template<typename Key,typename F,typename... Args>
-  BOOST_FORCEINLINE bool try_emplace_or_visit(Key&& x,F&& f,Args&&... args)
+  template<typename Key,typename... Args>
+  BOOST_FORCEINLINE bool try_emplace_or_visit(Key&& x,Args&&... args)
   {
-    return emplace_or_visit_impl(
-      group_exclusive{},std::forward<F>(f),
+    return emplace_or_visit_flast(
+      group_exclusive{},
       try_emplace_args_t{},std::forward<Key>(x),std::forward<Args>(args)...);
   }
 
-  template<typename Key,typename F,typename... Args>
-  BOOST_FORCEINLINE bool try_emplace_or_cvisit(Key&& x,F&& f,Args&&... args)
+  template<typename Key,typename... Args>
+  BOOST_FORCEINLINE bool try_emplace_or_cvisit(Key&& x,Args&&... args)
   {
-    return emplace_or_visit_impl(
-      group_shared{},std::forward<F>(f),
+    return emplace_or_visit_flast(
+      group_shared{},
       try_emplace_args_t{},std::forward<Key>(x),std::forward<Args>(args)...);
   }
 
-  template<typename F,typename... Args>
-  BOOST_FORCEINLINE bool emplace_or_visit(F&& f,Args&&... args)
+  template<typename... Args>
+  BOOST_FORCEINLINE bool emplace_or_visit(Args&&... args)
   {
-    return construct_and_emplace_or_visit(
-      group_exclusive{},std::forward<F>(f),std::forward<Args>(args)...);
+    return construct_and_emplace_or_visit_flast(
+      group_exclusive{},std::forward<Args>(args)...);
   }
 
-  template<typename F,typename... Args>
-  BOOST_FORCEINLINE bool emplace_or_cvisit(F&& f,Args&&... args)
+  template<typename... Args>
+  BOOST_FORCEINLINE bool emplace_or_cvisit(Args&&... args)
   {
-    return construct_and_emplace_or_visit(
-      group_shared{},std::forward<F>(f),std::forward<Args>(args)...);
+    return construct_and_emplace_or_visit_flast(
+      group_shared{},std::forward<Args>(args)...);
   }
 
   template<typename F>
@@ -880,6 +883,30 @@ private:
       group_shared{},[](const value_type&){},std::forward<Args>(args)...);
   }
 
+  struct call_construct_and_emplace_or_visit
+  {
+    template<typename... Args>
+    BOOST_FORCEINLINE bool operator()(
+      concurrent_table* this_,Args&&... args)const
+    {
+      return this_->construct_and_emplace_or_visit(
+        std::forward<Args>(args)...);
+    }
+  };
+
+  template<typename GroupAccessMode,typename... Args>
+  BOOST_FORCEINLINE bool construct_and_emplace_or_visit_flast(
+    GroupAccessMode access_mode,Args&&... args)
+  {
+    return mp11::tuple_apply(
+      call_construct_and_emplace_or_visit{},
+      std::tuple_cat(
+        std::make_tuple(this,access_mode),
+        tuple_rotate_right(std::forward_as_tuple(std::forward<Args>(args)...))
+      )
+    );
+  }
+
   template<typename GroupAccessMode,typename F,typename... Args>
   BOOST_FORCEINLINE bool construct_and_emplace_or_visit(
     GroupAccessMode access_mode,F&& f,Args&&... args)
@@ -914,6 +941,29 @@ private:
       access_mode,std::forward<F>(f),std::forward<Args>(args)...);
   }
 
+  struct call_emplace_or_visit_impl
+  {
+    template<typename... Args>
+    BOOST_FORCEINLINE bool operator()(
+      concurrent_table* this_,Args&&... args)const
+    {
+      return this_->emplace_or_visit_impl(std::forward<Args>(args)...);
+    }
+  };
+
+  template<typename GroupAccessMode,typename... Args>
+  BOOST_FORCEINLINE bool emplace_or_visit_flast(
+    GroupAccessMode access_mode,Args&&... args)
+  {
+    return mp11::tuple_apply(
+      call_emplace_or_visit_impl{},
+      std::tuple_cat(
+        std::make_tuple(this,access_mode),
+        tuple_rotate_right(std::forward_as_tuple(std::forward<Args>(args)...))
+      )
+    );
+  }
+
   template<typename GroupAccessMode,typename F,typename... Args>
   BOOST_FORCEINLINE bool emplace_or_visit_impl(
     GroupAccessMode access_mode,F&& f,Args&&... args)
diff --git a/include/boost/unordered/detail/foa/tuple_rotate_right.hpp b/include/boost/unordered/detail/foa/tuple_rotate_right.hpp
new file mode 100644
index 00000000..c63a7fb5
--- /dev/null
+++ b/include/boost/unordered/detail/foa/tuple_rotate_right.hpp
@@ -0,0 +1,47 @@
+/* Copyright 2023 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 https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_DETAIL_FOA_TUPLE_ROTATE_RIGHT_HPP
+#define BOOST_UNORDERED_DETAIL_FOA_TUPLE_ROTATE_RIGHT_HPP
+
+#include <boost/mp11/integer_sequence.hpp>
+#include <tuple>
+#include <utility>
+
+namespace boost{
+namespace unordered{
+namespace detail{
+namespace foa{
+
+template<std::size_t... Is,typename Tuple>
+auto tuple_rotate_right_aux(mp11::index_sequence<Is...>,Tuple&& x)
+  ->std::tuple<decltype(
+    std::get<(Is+sizeof...(Is)-1)%sizeof...(Is)>(std::forward<Tuple>(x)))...
+  >
+{
+  return {
+    std::get<(Is+sizeof...(Is)-1)%sizeof...(Is)>(std::forward<Tuple>(x))...};
+}
+
+template<typename Tuple>
+auto tuple_rotate_right(Tuple&& x)
+  ->decltype(tuple_rotate_right_aux(
+      mp11::make_index_sequence<std::tuple_size<Tuple>::value>{},
+      std::forward<Tuple>(x)))
+{
+  return tuple_rotate_right_aux(
+    mp11::make_index_sequence<std::tuple_size<Tuple>::value>{},
+    std::forward<Tuple>(x));
+}
+
+} /* namespace foa */
+} /* namespace detail */
+} /* namespace unordered */
+} /* namespace boost */
+
+#endif