select.rs.html -- source

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internals

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linked_hash_map

log

lib.rs macros.rs

matches

matrixmultiply

x86

macros.rs mod.rs

aligned_alloc.rs archparam.rs debugmacros.rs dgemm_kernel.rs gemm.rs kernel.rs lib.rs loopmacros.rs sgemm_kernel.rs util.rs

maybe_uninit

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memchr

x86

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

memoffset

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mime

mime_guess

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server

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nalgebra

base

geometry

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linalg

balancing.rs bidiagonal.rs cholesky.rs convolution.rs determinant.rs full_piv_lu.rs givens.rs hessenberg.rs householder.rs inverse.rs lu.rs mod.rs permutation_sequence.rs qr.rs schur.rs solve.rs svd.rs symmetric_eigen.rs symmetric_tridiagonal.rs

ndarray

ndarray_linalg

net2

sys

unix

impls.rs mod.rs

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

netlib_src

nix

num_complex

cast.rs crand.rs lib.rs pow.rs

num_cpus

lib.rs linux.rs

num_integer

lib.rs roots.rs

num_rational

num_traits

ops

checked.rs inv.rs mod.rs mul_add.rs saturating.rs wrapping.rs

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

legacy.rs lib.rs v0.rs

rustros_tf

lib.rs msg.rs transforms.rs

ryu

buffer

pretty

exponent.rs mantissa.rs mod.rs

common.rs d2s.rs d2s_full_table.rs d2s_intrinsics.rs digit_table.rs f2s.rs lib.rs

safemem

scopeguard

serde

de

from_primitive.rs ignored_any.rs impls.rs mod.rs utf8.rs value.rs

private

de.rs macros.rs mod.rs ser.rs

ser

impls.rs impossible.rs mod.rs

export.rs integer128.rs lib.rs macros.rs

serde_bytes

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serde_derive

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

serde_json

features_check

io

value

de.rs from.rs index.rs mod.rs partial_eq.rs ser.rs

de.rs error.rs iter.rs lib.rs macros.rs map.rs number.rs read.rs ser.rs

serde_xml_rs

error.rs lib.rs map.rs seq.rs serialize.rs var.rs

sha1

siphasher

lib.rs sip.rs sip128.rs

smallvec

syn

tempdir

term

terminfo

parser

compiled.rs names.rs

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

impls.rs lib.rs

twoway

bmh.rs lib.rs util.rs

typeable

typenum

array.rs bit.rs int.rs lib.rs marker_traits.rs operator_aliases.rs private.rs type_operators.rs uint.rs

ucd_util

unicode_tables

jamo_short_name.rs mod.rs

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

unicase

unicode_bidi

char_data

mod.rs tables.rs

deprecated.rs explicit.rs format_chars.rs implicit.rs level.rs lib.rs prepare.rs

unicode_normalization

__test_api.rs decompose.rs lib.rs lookups.rs normalize.rs perfect_hash.rs quick_check.rs recompose.rs stream_safe.rs tables.rs

unicode_xid

lib.rs tables.rs

url

encoding.rs form_urlencoded.rs host.rs lib.rs origin.rs parser.rs path_segments.rs quirks.rs slicing.rs

utf8_ranges

char_utf8.rs lib.rs

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

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

/// An adapter for merging the output of two streams.
///
/// The merged stream produces items from either of the underlying streams as
/// they become available, and the streams are polled in a round-robin fashion.
/// Errors, however, are not merged: you get at most one error at a time.
#[derive(Debug)]
#[must_use = "streams do nothing unless polled"]
pub struct Select<S1, S2> {
    stream1: Fuse<S1>,
    stream2: Fuse<S2>,
    flag: bool,
}

pub fn new<S1, S2>(stream1: S1, stream2: S2) -> Select<S1, S2>
    where S1: Stream,
          S2: Stream<Item = S1::Item, Error = S1::Error>
{
    Select {
        stream1: stream1.fuse(),
        stream2: stream2.fuse(),
        flag: false,
    }
}

impl<S1, S2> Stream for Select<S1, S2>
    where S1: Stream,
          S2: Stream<Item = S1::Item, Error = S1::Error>
{
    type Item = S1::Item;
    type Error = S1::Error;

    fn poll(&mut self) -> Poll<Option<S1::Item>, S1::Error> {
        let (a, b) = if self.flag {
            (&mut self.stream2 as &mut Stream<Item=_, Error=_>,
             &mut self.stream1 as &mut Stream<Item=_, Error=_>)
        } else {
            (&mut self.stream1 as &mut Stream<Item=_, Error=_>,
             &mut self.stream2 as &mut Stream<Item=_, Error=_>)
        };
        self.flag = !self.flag;

        let a_done = match a.poll()? {
            Async::Ready(Some(item)) => return Ok(Some(item).into()),
            Async::Ready(None) => true,
            Async::NotReady => false,
        };

        match b.poll()? {
            Async::Ready(Some(item)) => {
                // If the other stream isn't finished yet, give them a chance to
                // go first next time as we pulled something off `b`.
                if !a_done {
                    self.flag = !self.flag;
                }
                Ok(Some(item).into())
            }
            Async::Ready(None) if a_done => Ok(None.into()),
            Async::Ready(None) | Async::NotReady => Ok(Async::NotReady),
        }
    }
}

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