Added Loopback::matches_response.

include/tins/loopback.h

@@ -86,6 +86,15 @@ public:
      */
     PDUType pdu_type() const { return pdu_flag; }
     
+    /** 
+     * \brief Check wether ptr points to a valid response for this PDU.
+     *
+     * \sa PDU::matches_response
+     * \param ptr The pointer to the buffer.
+     * \param total_sz The size of the buffer.
+     */
+    bool matches_response(const uint8_t *ptr, uint32_t total_sz) const;
+    
     /**
      * \sa PDU::clone
      */