Forward a query to the underlying executor.

template<
    typename Property>
query_result_t< const Executor &, Property > query(
    const Property & p,
    constraint_t< can_query< const Executor &, Property >::value >  = 0,
    constraint_t< !is_convertible< Property, execution::blocking_t >::value >  = 0,
    constraint_t< !is_convertible< Property, execution::inline_exception_handling_t >::value >  = 0) const;

Do not call this function directly. It is intended for use with the query customisation point.

For example:

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