|  | 
            Query the current value of the context
            property.
          
io_context & query( execution::context_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(); asio::io_context& ctx = asio::query( ex, asio::execution::context);