#### strand::query

Forward a query to the underlying executor.

    template<
        typename Property>
    enable_if< can_query< const Executor &, Property >::value, typename query_result< const Executor &, Property >::type >::type query(
        const Property & p) const;

Do not call this function directly. It is intended for use with the `execution::execute` customisation point.

For example:

    asio::strand<my_executor_type> ex = ...;
    if (asio::query(ex, asio::execution::blocking)
          == asio::execution::blocking.never)
      ...