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Forward a query to the underlying executor.
template<
    typename Property>
constraint< can_query< const Executor &, Property >::value, typename conditional< is_convertible< Property, execution::blocking_t >::value, execution::blocking_t, typename query_result< const Executor &, Property >::type >::type >::type query(
    const Property & p) const;
          Do not call this function directly. It is intended for use with the query customisation
          point.
        
For example:
boost::asio::strand<my_executor_type> ex = ...;
if (boost::asio::query(ex, boost::asio::execution::blocking)
      == boost::asio::execution::blocking.never)
  ...