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   1 # void pq\Cancel::__construct(pq\Connection $conn)
   2
   3 Create a new cancellation request for an [asynchronous](pq/Connection/: Asynchronous Usage) query.
   4
   5 ## Params:
   6
   7 * pq\Connection $conn
   8   The connection to request cancellation on.
   9
  10 ## Throws:
  11
  12 * pq\Exception\InvalidArgumentException
  13 * pq\Exception\BadMethodCallException
  14 * pq\Exception\RuntimeException