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)
  ...