Async: Move callOriginalCb out of AsyncCont base, into NonPostedAC

The reasoning here is to prevent silent invocations of
callOriginalCb from a base class pointer/ref.

include/asynchronousContinuation.h

@@ -33,23 +33,6 @@ public:
 		std::shared_ptr<AsynchronousContinuation<OriginalCbFnT>>
 			lifetimePreservingConveyance);
 
-	/**
-	 * @brief Call the original callback with perfect forwarding
-	 *
-	 * IMPORTANT: This method cannot be virtual because templates cannot be
-	 * virtual in C++. Therefore, this method MUST be called from the
-	 * most-derived class reference/pointer context. Never call this method
-	 * through a polymorphic base class reference/pointer, as it will not
-	 * dispatch to the correct derived class implementation.
-	 *
-	 * @param args Arguments to forward to the original callback
-	 */
-	template<typename... Args>
-	void callOriginalCb(Args&&... args)
-	{
-		if (originalCbFn) { originalCbFn(std::forward<Args>(args)...); }
-	}
-
 public:
 	OriginalCbFnT originalCbFn;
 };
@@ -73,8 +56,24 @@ public:
 	:	AsynchronousContinuation<OriginalCbFnT>(originalCbFn)
 	{}
 
-public:
-	using AsynchronousContinuation<OriginalCbFnT>::callOriginalCb;
+	/**
+	 * @brief Call the original callback with perfect forwarding
+	 * (immediate execution)
+	 *
+	 * This implementation calls the original callback immediately without
+	 * posting to any thread or queue. Used for non-posted continuations.
+	 *
+	 * @param args Arguments to forward to the original callback
+	 */
+	template<typename... Args>
+	void callOriginalCb(Args&&... args)
+	{
+		if (AsynchronousContinuation<OriginalCbFnT>::originalCbFn)
+		{
+			AsynchronousContinuation<OriginalCbFnT>::originalCbFn(
+				std::forward<Args>(args)...);
+		}
+	}
 };
 
 template <class OriginalCbFnT>
@@ -92,7 +91,8 @@ public:
 	template<typename... Args>
 	void callOriginalCb(Args&&... args)
 	{
-		if (AsynchronousContinuation<OriginalCbFnT>::originalCbFn) {
+		if (AsynchronousContinuation<OriginalCbFnT>::originalCbFn)
+		{
 			caller->getIoService().post(
 				std::bind(
 					AsynchronousContinuation<OriginalCbFnT>::originalCbFn,
@@ -102,7 +102,6 @@ public:
 
 public:
 	std::shared_ptr<ComponentThread> caller;
-	using AsynchronousContinuation<OriginalCbFnT>::callOriginalCb;
 };
 
 template <class OriginalCbFnT>
@@ -125,9 +124,6 @@ public:
 		PostedAsynchronousContinuation<OriginalCbFnT>::callOriginalCb(
 			std::forward<Args>(args)...);
 	}
-
-public:
-	using AsynchronousContinuation<OriginalCbFnT>::callOriginalCb;
 };
 
 } // namespace smo