or_else.rs.html -- source

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adler32

aho_corasick

packed

teddy

compile.rs mod.rs runtime.rs

api.rs mod.rs pattern.rs rabinkarp.rs vector.rs

ahocorasick.rs automaton.rs buffer.rs byte_frequencies.rs classes.rs dfa.rs error.rs lib.rs nfa.rs prefilter.rs state_id.rs

alga

general

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linear

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approx

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ascii

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atty

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backtrace

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symbolize

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backtrace_sys

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generic_array

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getrandom

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hex

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hyper

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header

common

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internals

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shared

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mod.rs parsing.rs

http

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server

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buffer.rs error.rs lib.rs method.rs net.rs status.rs uri.rs version.rs

idna

lib.rs punycode.rs uts46.rs

itoa

language_tags

lapack_src

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libc

unix

linux_like

linux

gnu

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align.rs mod.rs

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libm

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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

md5

consts.rs lib.rs utils.rs

memchr

x86

avx.rs mod.rs sse2.rs

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

memoffset

lib.rs offset_of.rs span_of.rs

mime

mime_guess

multipart

server

boundary.rs field.rs mod.rs save.rs

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

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private

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ser

impls.rs impossible.rs mod.rs

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

serde_bytes

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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

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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 {Future, IntoFuture, Poll};
use super::chain::Chain;

/// Future for the `or_else` combinator, chaining a computation onto the end of
/// a future which fails with an error.
///
/// This is created by the `Future::or_else` method.
#[derive(Debug)]
#[must_use = "futures do nothing unless polled"]
pub struct OrElse<A, B, F> where A: Future, B: IntoFuture {
    state: Chain<A, B::Future, F>,
}

pub fn new<A, B, F>(future: A, f: F) -> OrElse<A, B, F>
    where A: Future,
          B: IntoFuture<Item=A::Item>,
{
    OrElse {
        state: Chain::new(future, f),
    }
}

impl<A, B, F> Future for OrElse<A, B, F>
    where A: Future,
          B: IntoFuture<Item=A::Item>,
          F: FnOnce(A::Error) -> B,
{
    type Item = B::Item;
    type Error = B::Error;

    fn poll(&mut self) -> Poll<B::Item, B::Error> {
        self.state.poll(|a, f| {
            match a {
                Ok(item) => Ok(Ok(item)),
                Err(e) => Ok(Err(f(e).into_future()))
            }
        })
    }
}

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