Add some default implementations for i_matrix interface, which is useful for a dummy matrix.

include/ascs/base.h

@@ -71,9 +71,10 @@ public:
 	virtual service_pump& get_service_pump() = 0;
 	virtual const service_pump& get_service_pump() const = 0;
 
-	virtual bool socket_exist(uint_fast64_t id) = 0;
-	virtual std::shared_ptr<tracked_executor> find_socket(uint_fast64_t id) = 0;
-	virtual bool del_socket(uint_fast64_t id) = 0;
+	//following implementation is useful for a dummy matrix, for example, in a proxy server, each server_socket (dummy matrix) contains a client_socket
+	virtual bool socket_exist(uint_fast64_t id) {return false;}
+	virtual std::shared_ptr<tracked_executor> find_socket(uint_fast64_t id) {return std::shared_ptr<tracked_executor>();}
+	virtual bool del_socket(uint_fast64_t id) {return false;}
 };
 
 namespace tcp
@@ -81,7 +82,7 @@ namespace tcp
 	class i_server : public i_matrix
 	{
 	private:
-		virtual	bool del_socket(uint_fast64_t id) {return false;} //implement and hide i_matrix::del_socket
+		using i_matrix::del_socket; //hide i_matrix::del_socket
 
 	public:
 		virtual bool del_socket(const std::shared_ptr<tracked_executor>& socket_ptr) = 0;