iter_ok.rs.html -- source

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arrayvec

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atty

backtrace

backtrace

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symbolize

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backtrace_sys

base64

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bincode

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ser

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bitflags

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bytes

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c2_chacha

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clap

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crossbeam_utils

atomic

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sync

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backoff.rs cache_padded.rs lib.rs thread.rs

ctrlc

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daemon

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failure

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error

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failure_derive

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stream

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getrandom

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glob

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lock_api

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log

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memchr

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net2

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bounds.rs cast.rs float.rs identities.rs int.rs lib.rs macros.rs pow.rs sign.rs

open

parking_lot

condvar.rs deadlock.rs elision.rs lib.rs mutex.rs once.rs raw_mutex.rs raw_rwlock.rs remutex.rs rwlock.rs util.rs

parking_lot_core

thread_parker

linux.rs mod.rs

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pem

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ppv_lite86

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proc_macro2

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quote

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rand_jitter

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rand_os

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rand_pcg

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rand_xorshift

rcgen

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private

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ser

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slab

smallvec

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stream_cancel

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strsim

syn

synstructure

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tempfile

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textwrap

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thread_local

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time

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tokio

codec

length_delimited.rs mod.rs

executor

current_thread

reactor

mod.rs poll_evented.rs

runtime

current_thread

builder.rs mod.rs runtime.rs

threadpool

builder.rs mod.rs shutdown.rs task_executor.rs

util

enumerate.rs future.rs mod.rs stream.rs

clock.rs fs.rs io.rs lib.rs net.rs prelude.rs sync.rs timer.rs

tokio_codec

bytes_codec.rs lib.rs lines_codec.rs

tokio_core

tokio_current_thread

lib.rs scheduler.rs

tokio_executor

enter.rs error.rs executor.rs global.rs lib.rs park.rs typed.rs

tokio_fs

tokio_io

tokio_reactor

background.rs lib.rs poll_evented.rs registration.rs sharded_rwlock.rs

tokio_rustls

common

mod.rs vecbuf.rs

client.rs lib.rs server.rs

tokio_sync

mpsc

block.rs bounded.rs chan.rs list.rs mod.rs unbounded.rs

task

atomic_task.rs mod.rs

lib.rs lock.rs loom.rs oneshot.rs semaphore.rs watch.rs

tokio_tcp

incoming.rs lib.rs listener.rs stream.rs

tokio_threadpool

tokio_timer

tokio_udp

frame.rs lib.rs recv_dgram.rs send_dgram.rs socket.rs

tokio_uds

datagram.rs frame.rs incoming.rs lib.rs listener.rs recv_dgram.rs send_dgram.rs stream.rs ucred.rs

unicode_width

lib.rs tables.rs

unicode_xid

lib.rs tables.rs

untrusted

vec_map

void

webpki

calendar.rs cert.rs der.rs error.rs name.rs signed_data.rs time.rs trust_anchor_util.rs verify_cert.rs webpki.rs

windows_service

x11

dpms.rs glx.rs internal.rs keysym.rs lib.rs link.rs xcursor.rs xf86vmode.rs xfixes.rs xft.rs xinerama.rs xinput.rs xinput2.rs xlib.rs xlib_xcb.rs xmd.rs xmu.rs xrandr.rs xrecord.rs xrender.rs xss.rs xt.rs xtest.rs

xcb

ffi

base.rs big_requests.rs xc_misc.rs xkb.rs xproto.rs

base.rs big_requests.rs lib.rs xc_misc.rs xkb.rs xproto.rs

xkbcommon

xkb

x11

compose.rs ffi.rs keysyms.rs mod.rs

yasna

deserializer

models

der.rs mod.rs oid.rs time.rs

reader

error.rs mod.rs

serializer

tags

writer

use core::marker;

use {Async, Poll};
use stream::Stream;

/// A stream which is just a shim over an underlying instance of `Iterator`.
///
/// This stream will never block and is always ready.
#[derive(Debug)]
#[must_use = "streams do nothing unless polled"]
pub struct IterOk<I, E> {
    iter: I,
    _marker: marker::PhantomData<fn() -> E>,
}

/// Converts an `Iterator` into a `Stream` which is always ready
/// to yield the next value.
///
/// Iterators in Rust don't express the ability to block, so this adapter
/// simply always calls `iter.next()` and returns that.
///
/// ```rust
/// use futures::*;
///
/// let mut stream = stream::iter_ok::<_, ()>(vec![17, 19]);
/// assert_eq!(Ok(Async::Ready(Some(17))), stream.poll());
/// assert_eq!(Ok(Async::Ready(Some(19))), stream.poll());
/// assert_eq!(Ok(Async::Ready(None)), stream.poll());
/// ```
pub fn iter_ok<I, E>(i: I) -> IterOk<I::IntoIter, E>
    where I: IntoIterator,
{
    IterOk {
        iter: i.into_iter(),
        _marker: marker::PhantomData,
    }
}

impl<I, E> Stream for IterOk<I, E>
    where I: Iterator,
{
    type Item = I::Item;
    type Error = E;

    fn poll(&mut self) -> Poll<Option<I::Item>, E> {
        Ok(Async::Ready(self.iter.next()))
    }
}