anchor.diff:  %% limitations under the License.
   %%--------------------------------------------------------------------
   
  -%% @doc MQTT Topic Functions
   -module(emqttd_topic).
   
   -import(lists, [reverse/1]).
  
positive.code: -spec is_queue(topic()) -> boolean().
  is_queue(<<"$Q/", _Queue/binary>>) ->
      true;
  is_queue(_) ->
      false.
  
  
negative.code: -export([match/2, validate/1, triples/1, words/1, wildcard/1]).
  
  -export([join/1, feed_var/3, is_queue/1, systop/1]).
  
  -ifdef(TEST).
  -compile(export_all).
  -endif.
  
  -type topic() :: binary().
  
  