Add convenience method to determine if a MAC address is globally uniq…

…ue or locally assigned.

include/tins/hw_address.h

@@ -374,6 +374,20 @@ class HWAddress {
         return !is_broadcast() && !is_multicast();
     }
 
+    /**
+     * \brief Indicates whether this is a globally unique address.
+     */
+    bool is_globally_unique() const {
+        return !is_locally_assigned();
+    }
+
+    /**
+     * \brief Indicates whether this is a locally assigned address.
+     */
+    bool is_locally_assigned() const {
+        return (*begin() & 0x02);
+    }
+
     /**
      * \brief Convert this address to a hex-notation std::string address.
      *