select_all.rs.html -- source

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adler32

aho_corasick

packed

teddy

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alga

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shared

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idna

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itoa

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linked_hash_map

log

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matches

matrixmultiply

x86

macros.rs mod.rs

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maybe_uninit

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memchr

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fallback.rs iter.rs lib.rs naive.rs

memoffset

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mime

mime_guess

multipart

server

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nalgebra

base

geometry

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linalg

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ndarray

ndarray_linalg

net2

sys

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impls.rs mod.rs

ext.rs lib.rs socket.rs tcp.rs udp.rs unix.rs utils.rs

netlib_src

nix

num_complex

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num_cpus

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num_integer

lib.rs roots.rs

num_rational

num_traits

ops

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

opaque_debug

percent_encoding

phf

lib.rs map.rs ordered_map.rs ordered_set.rs set.rs

phf_shared

ppv_lite86

x86_64

lib.rs soft.rs types.rs

proc_macro2

detection.rs fallback.rs lib.rs strnom.rs wrapper.rs

quick_error

quote

ext.rs format.rs ident_fragment.rs lib.rs runtime.rs spanned.rs to_tokens.rs

rand

rand_chacha

chacha.rs guts.rs lib.rs

rand_core

block.rs error.rs impls.rs le.rs lib.rs os.rs

rand_distr

binomial.rs cauchy.rs dirichlet.rs exponential.rs gamma.rs lib.rs normal.rs pareto.rs pert.rs poisson.rs triangular.rs unit_ball.rs unit_circle.rs unit_disc.rs unit_sphere.rs utils.rs weibull.rs ziggurat_tables.rs

rawpointer

regex

regex_syntax

remove_dir_all

rosrust

rosrust_codegen

error.rs genmsg.rs helpers.rs lib.rs message_path.rs msg.rs output_layout.rs rosmsg_include.rs

rosrust_msg

rouille

rustc_demangle

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rustros_tf

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ryu

buffer

pretty

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safemem

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private

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ser

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serde_bytes

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bound.rs de.rs dummy.rs fragment.rs lib.rs pretend.rs ser.rs try.rs

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serde_xml_rs

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sha1

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lib.rs sip.rs sip128.rs

smallvec

syn

tempdir

term

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mod.rs parm.rs searcher.rs

thread_local

cached.rs lib.rs thread_id.rs unreachable.rs

threadpool

time

display.rs duration.rs lib.rs parse.rs sys.rs

tiny_http

util

custom_stream.rs equal_reader.rs messages_queue.rs mod.rs refined_tcp_stream.rs sequential.rs task_pool.rs

client.rs common.rs lib.rs request.rs response.rs

traitobject

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twoway

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typeable

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ucd_util

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hangul.rs ideograph.rs lib.rs name.rs property.rs

unicase

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unicode_normalization

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unicode_xid

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url

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utf8_ranges

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void

xml

xml_rpc

xmlfmt

de.rs error.rs mod.rs parse.rs ser.rs value.rs

client.rs error.rs lib.rs server.rs

yaml_rust

emitter.rs lib.rs parser.rs scanner.rs yaml.rs

//! Definition of the `SelectAll`, finding the first future in a list that
//! finishes.

use std::mem;
use std::prelude::v1::*;

use {Future, IntoFuture, Poll, Async};

/// Future for the `select_all` combinator, waiting for one of any of a list of
/// futures to complete.
///
/// This is created by the `select_all` function.
#[derive(Debug)]
#[must_use = "futures do nothing unless polled"]
pub struct SelectAll<A> where A: Future {
    inner: Vec<A>,
}

#[doc(hidden)]
pub type SelectAllNext<A> = A;

/// Creates a new future which will select over a list of futures.
///
/// The returned future will wait for any future within `iter` to be ready. Upon
/// completion or failure the item resolved will be returned, along with the
/// index of the future that was ready and the list of all the remaining
/// futures.
///
/// # Panics
///
/// This function will panic if the iterator specified contains no items.
pub fn select_all<I>(iter: I) -> SelectAll<<I::Item as IntoFuture>::Future>
    where I: IntoIterator,
          I::Item: IntoFuture,
{
    let ret = SelectAll {
        inner: iter.into_iter()
                   .map(|a| a.into_future())
                   .collect(),
    };
    assert!(ret.inner.len() > 0);
    ret
}

impl<A> Future for SelectAll<A>
    where A: Future,
{
    type Item = (A::Item, usize, Vec<A>);
    type Error = (A::Error, usize, Vec<A>);

    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
        let item = self.inner.iter_mut().enumerate().filter_map(|(i, f)| {
            match f.poll() {
                Ok(Async::NotReady) => None,
                Ok(Async::Ready(e)) => Some((i, Ok(e))),
                Err(e) => Some((i, Err(e))),
            }
        }).next();
        match item {
            Some((idx, res)) => {
                self.inner.remove(idx);
                let rest = mem::replace(&mut self.inner, Vec::new());
                match res {
                    Ok(e) => Ok(Async::Ready((e, idx, rest))),
                    Err(e) => Err((e, idx, rest)),
                }
            }
            None => Ok(Async::NotReady),
        }
    }
}

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