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            Query the current value of the blocking property.
          
constexpr execution::blocking_t query(
    execution::blocking_t ) const;
            Do not call this function directly. It is intended for use with the
            query
            customisation point.
          
For example:
auto ex = my_io_context.get_executor();
if (boost::asio::query(ex, boost::asio::execution::blocking)
      == boost::asio::execution::blocking.always)
  ...