You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: io.rs
    path of file: ./repos/ntex/ntex-io/src
    
    the code of the file until where you have to start completion: use std::cell::Cell;
use std::future::{poll_fn, Future};
use std::task::{Context, Poll};
use std::{fmt, hash, io, marker, mem, ops, pin::Pin, ptr, rc::Rc};

use ntex_bytes::{PoolId, PoolRef};
use ntex_codec::{Decoder, Encoder};
use ntex_util::{future::Either, task::LocalWaker, time::Seconds};

use crate::buf::Stack;
use crate::filter::{Base, Filter, Layer, NullFilter};
use crate::seal::Sealed;
use crate::tasks::{ReadContext, WriteContext};
use crate::timer::TimerHandle;
use crate::{Decoded, FilterLayer, Handle, IoStatusUpdate, IoStream, RecvError};

bitflags::bitflags! {
    #[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd, Hash)]
    pub struct Flags: u16 {
        /// io is closed
        const IO_STOPPED          = 0b0000_0000_0000_0001;
        /// shutdown io tasks
        const IO_STOPPING         = 0b0000_0000_0000_0010;
        /// shuting down filters
        const IO_ST
    
    pub fn with_memory_pool<I: IoStream>(io: I, pool: PoolRef) -> Self {
        let inner = Rc::new(IoState {
            pool: Cell::new(pool),
            flags: Cell::new(Flags::empty()),
            error: Cell::new(None),
            disconnect_timeout: Cell::new(Seconds(1)),
            dispatch_task: LocalWaker::new(),
            read_task: LocalWaker::new(),
            write_task: LocalWaker::new(),
            buffer: Stack::new(),
            filter: Cell::new(NullFilter::get()),
            handle: Cell::new(None),
            timeout: Cell::new(TimerHandle::default()),
            on_disconnect: Cell::new(None),
            tag: Cell::new(DEFAULT_TAG),
        });

        let filter = Box::new(Base::new(IoRef(inner.clone())));
        let filter_ref: &'static dyn Filter = unsafe {
            let filter: &dyn Filter = filter.as_ref();
            std::mem::transmute(filter)
        };
        inner.filter.replace(filter_ref);

        let io_ref = IoRef(inner);

        // start io tasks
        let hnd = io.start(ReadContext::new(&io_ref), WriteContext::new(&io_ref));
        io_ref.0.handle.set(hnd);

        Io(io_ref, FilterItem::with_filter(filter))
    }