+template <typename T>
+bool GetChangePolicy(const char ** attr, T & value, const std::string & attrName)
+{
+if (!CheckValue(attr, attrName))
+ return false;
+std::string type(attr[1]);
+if (type == "allow")
+ value = TARIFF::ALLOW;
+else if (type == "to_cheap")
+ value = TARIFF::TO_CHEAP;
+else if (type == "to_expensive")
+ value = TARIFF::TO_EXPENSIVE;
+else if (type == "deny")
+ value = TARIFF::DENY;
+else
+ return false;
+return true;
+}
+