include/Base_Provider.h

@@ -21,6 +21,7 @@ public:
 
 	virtual int open()=0;
 	virtual int close()=0;
+	virtual bool isOpen() = 0;
 	virtual void setDest(std::string dest) = 0;
 	virtual std::string getDest() = 0;
 	virtual ~BaseProvider() = default;