or_else.rs.html -- source

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adler32

aho_corasick

packed

teddy

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approx

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arrayvec

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ascii

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backtrace

backtrace

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symbolize

dladdr.rs libbacktrace.rs mod.rs

capture.rs lib.rs print.rs types.rs

backtrace_sys

base64

write

encoder.rs mod.rs

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bitflags

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cfg_if

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offset

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chunked_transfer

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color_quant

cookie

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cookie_store

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crc32fast

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baseline.rs combine.rs lib.rs table.rs

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crossbeam_queue

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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

csv

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csv_core

lib.rs reader.rs writer.rs

csv_user_import

csv_user_import.rs

deflate

diesel

associations

belongs_to.rs mod.rs

connection

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expression

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macros

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migration

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mysql

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stmt

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query_builder

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types

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query_builder

delete_statement

insert_statement

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nodes

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update_statement

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sql_types

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types

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diesel_derives

as_changeset.rs as_expression.rs associations.rs diagnostic_shim.rs diesel_numeric_ops.rs field.rs from_sql_row.rs identifiable.rs insertable.rs lib.rs meta.rs model.rs query_id.rs queryable.rs queryable_by_name.rs resolved_at_shim.rs sql_type.rs util.rs

diesel_migrations

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dotenv

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dtoa

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either

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failure

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zlib

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fnv

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stream

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task_impl

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gif

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common.rs encoder.rs lib.rs traits.rs util.rs

google_signin

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gzip_header

crc_reader.rs lib.rs

h2

http

header

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uri

authority.rs builder.rs mod.rs path.rs port.rs scheme.rs

byte_str.rs convert.rs error.rs extensions.rs lib.rs method.rs request.rs response.rs status.rs version.rs

http_body

httparse

simd

avx2.rs mod.rs sse42.rs

iter.rs lib.rs macros.rs

hyper

body

body.rs chunk.rs mod.rs payload.rs

client

connect

dns.rs http.rs mod.rs

conn.rs dispatch.rs mod.rs pool.rs

common

io

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buf.rs drain.rs exec.rs lazy.rs mod.rs never.rs task.rs

proto

h1

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h2

client.rs mod.rs server.rs

server

conn.rs mod.rs shutdown.rs tcp.rs

service

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error.rs headers.rs lib.rs rt.rs upgrade.rs

hyper_rustls

hyper_tls

client.rs lib.rs stream.rs

idna

lib.rs punycode.rs uts46.rs

image

indexmap

equivalent.rs lib.rs macros.rs map.rs mutable_keys.rs set.rs util.rs

inflate

checksum.rs lib.rs reader.rs utils.rs writer.rs

iovec

sys

itoa

jpeg_decoder

worker

immediate.rs mod.rs threaded.rs

decoder.rs error.rs huffman.rs idct.rs lib.rs marker.rs parser.rs upsampler.rs

language_tags

lazy_static

inline_lazy.rs lib.rs

libc

unix

linux_like

linux

gnu

b64

x86_64

mod.rs not_x32.rs

align.rs mod.rs

align.rs mod.rs

align.rs mod.rs

fixed_width_ints.rs lib.rs macros.rs

lock_api

lib.rs mutex.rs remutex.rs rwlock.rs

log

lib.rs macros.rs

lzw

bitstream.rs lib.rs lzw.rs

matches

memchr

x86

avx.rs mod.rs sse2.rs

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

memoffset

lib.rs offset_of.rs span_of.rs

migrations_internals

connection.rs lib.rs migration.rs schema.rs

migrations_macros

embed_migrations.rs lib.rs migrations.rs util.rs

mime

mime_guess

miniz_oxide

deflate

buffer.rs core.rs mod.rs stream.rs

inflate

core.rs mod.rs output_buffer.rs stream.rs

lib.rs shared.rs

mio

multipart

server

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

mysqlclient_sys

bindings_macos.rs lib.rs

native_tls

imp

net2

sys

unix

impls.rs mod.rs

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

nodrop

num_cpus

num_derive

num_integer

lib.rs roots.rs

num_iter

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

openssl

openssl_probe

openssl_sys

ordered_float

owning_ref

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

lib.rs parking_lot.rs spinwait.rs util.rs word_lock.rs

percent_encoding

phf

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

phf_shared

png

decoder

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chunk.rs common.rs encoder.rs filter.rs lib.rs traits.rs utils.rs

proc_macro2

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

publicsuffix

errors.rs lib.rs

quick_error

quote

ext.rs lib.rs runtime.rs to_tokens.rs

r2d2

config.rs event.rs lib.rs

rand

rand_chacha

chacha.rs lib.rs

rand_core

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hc128.rs lib.rs

rand_isaac

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rand_os

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rand_pcg

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rand_xorshift

rayon

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rayon_core

compile_fail

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join

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regex

regex_automata

classes.rs dense.rs dfa.rs lib.rs regex.rs sparse.rs state_id.rs

regex_syntax

remove_dir_all

reqwest

ring

rouille

rustc_demangle

legacy.rs lib.rs v0.rs

rustls

rusttype

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

scheduled_thread_pool

lib.rs thunk.rs

scoped_threadpool

scopeguard

sct

serde

de

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private

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ser

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

serde_derive

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ast.rs attr.rs case.rs check.rs ctxt.rs mod.rs symbol.rs

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

serde_json

value

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

serde_urlencoded

ser

key.rs mod.rs pair.rs part.rs value.rs

sha1

simplelog

loggers

comblog.rs logging.rs mod.rs simplelog.rs termlog.rs writelog.rs

config.rs lib.rs

siphasher

lib.rs sip.rs sip128.rs

slab

smallvec

stable_deref_trait

stb_truetype

string

syn

synom

helper.rs lib.rs space.rs

synstructure

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tempdir

term

terminfo

parser

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thread_local

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threadpool

tiff

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encoder

colortype.rs mod.rs writer.rs

error.rs lib.rs

time

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tiny_http

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

tokio

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reactor

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runtime

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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 io.rs lib.rs net.rs prelude.rs timer.rs

tokio_buf

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lib.rs never.rs size_hint.rs str.rs u8.rs

tokio_current_thread

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

tokio_io

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tokio_sync

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task

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

tokio_tcp

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try_from

char.rs int.rs lib.rs

try_lock

twoway

bmh.rs lib.rs util.rs

typeable

unicase

unicode

ascii.rs lib.rs

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

decompose.rs lib.rs normalize.rs quick_check.rs recompose.rs stream_safe.rs tables.rs

unicode_xid

lib.rs tables.rs

untrusted

url

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

uuid

adapter

core_support

parser

core_support.rs mod.rs std_support.rs

builder.rs core_support.rs lib.rs prelude.rs std_support.rs v4.rs

want

webdev_lib

chemicals

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permissions

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tests

question_categories

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questions

models.rs requests.rs schema.rs

test_sessions

models.rs requests.rs schema.rs

tests

models.rs requests.rs schema.rs

question_categories.rs questions.rs test_sessions.rs tests.rs

users

models.rs requests.rs schema.rs

chemicals.rs errors.rs lib.rs permissions.rs search.rs tests.rs users.rs

webpki

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

webpki_roots

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()))
            }
        })
    }
}