diff --git a/asio/include/asio/bind_allocator.hpp b/asio/include/asio/bind_allocator.hpp
index 0c520f0ad1..a9d913aa25 100644
--- a/asio/include/asio/bind_allocator.hpp
+++ b/asio/include/asio/bind_allocator.hpp
@@ -345,14 +345,21 @@ class allocator_binder
 
   /// Forwarding function call operator.
   template <typename... Args>
-  result_of_t<T(Args...)> operator()(Args&&... args)
+  result_of_t<T(Args...)> operator()(Args&&... args) &
   {
     return target_(static_cast<Args&&>(args)...);
   }
 
   /// Forwarding function call operator.
   template <typename... Args>
-  result_of_t<T(Args...)> operator()(Args&&... args) const
+  result_of_t<T(Args...)> operator()(Args&&... args) &&
+  {
+    return static_cast<T&&>(target_)(static_cast<Args&&>(args)...);
+  }
+
+  /// Forwarding function call operator.
+  template <typename... Args>
+  result_of_t<T(Args...)> operator()(Args&&... args) const&
   {
     return target_(static_cast<Args&&>(args)...);
   }
diff --git a/asio/include/asio/bind_cancellation_slot.hpp b/asio/include/asio/bind_cancellation_slot.hpp
index 321237968c..33fe8fcf86 100644
--- a/asio/include/asio/bind_cancellation_slot.hpp
+++ b/asio/include/asio/bind_cancellation_slot.hpp
@@ -351,14 +351,21 @@ class cancellation_slot_binder
 
   /// Forwarding function call operator.
   template <typename... Args>
-  result_of_t<T(Args...)> operator()(Args&&... args)
+  result_of_t<T(Args...)> operator()(Args&&... args) &
   {
     return target_(static_cast<Args&&>(args)...);
   }
 
   /// Forwarding function call operator.
   template <typename... Args>
-  result_of_t<T(Args...)> operator()(Args&&... args) const
+  result_of_t<T(Args...)> operator()(Args&&... args) &&
+  {
+    return static_cast<T&&>(target_)(static_cast<Args&&>(args)...);
+  }
+
+  /// Forwarding function call operator.
+  template <typename... Args>
+  result_of_t<T(Args...)> operator()(Args&&... args) const&
   {
     return target_(static_cast<Args&&>(args)...);
   }
diff --git a/asio/include/asio/bind_executor.hpp b/asio/include/asio/bind_executor.hpp
index fcfafe218b..488e45b23d 100644
--- a/asio/include/asio/bind_executor.hpp
+++ b/asio/include/asio/bind_executor.hpp
@@ -378,14 +378,21 @@ class executor_binder
 
   /// Forwarding function call operator.
   template <typename... Args>
-  result_of_t<T(Args...)> operator()(Args&&... args)
+  result_of_t<T(Args...)> operator()(Args&&... args) &
   {
     return this->target_(static_cast<Args&&>(args)...);
   }
 
   /// Forwarding function call operator.
   template <typename... Args>
-  result_of_t<T(Args...)> operator()(Args&&... args) const
+  result_of_t<T(Args...)> operator()(Args&&... args) &&
+  {
+    return static_cast<T&&>(this->target_)(static_cast<Args&&>(args)...);
+  }
+
+  /// Forwarding function call operator.
+  template <typename... Args>
+  result_of_t<T(Args...)> operator()(Args&&... args) const&
   {
     return this->target_(static_cast<Args&&>(args)...);
   }
diff --git a/asio/include/asio/bind_immediate_executor.hpp b/asio/include/asio/bind_immediate_executor.hpp
index b419c1594b..7be2264d48 100644
--- a/asio/include/asio/bind_immediate_executor.hpp
+++ b/asio/include/asio/bind_immediate_executor.hpp
@@ -350,14 +350,21 @@ class immediate_executor_binder
 
   /// Forwarding function call operator.
   template <typename... Args>
-  result_of_t<T(Args...)> operator()(Args&&... args)
+  result_of_t<T(Args...)> operator()(Args&&... args) &
   {
     return target_(static_cast<Args&&>(args)...);
   }
 
   /// Forwarding function call operator.
   template <typename... Args>
-  result_of_t<T(Args...)> operator()(Args&&... args) const
+  result_of_t<T(Args...)> operator()(Args&&... args) &&
+  {
+    return static_cast<T&&>(target_)(static_cast<Args&&>(args)...);
+  }
+
+  /// Forwarding function call operator.
+  template <typename... Args>
+  result_of_t<T(Args...)> operator()(Args&&... args) const&
   {
     return target_(static_cast<Args&&>(args)...);
   }