Files
adler32
aho_corasick
approx
arrayvec
ascii
backtrace
backtrace_sys
base64
bitflags
brotli2
brotli_sys
bstr
byteset
search
unicode
buf_redux
byteorder
bytes
cfg_if
chrono
format
naive
offset
chunked_transfer
color_quant
cookie
cookie_store
crc32fast
crossbeam_deque
crossbeam_epoch
crossbeam_queue
crossbeam_utils
csv
csv_core
csv_user_import
deflate
diesel
associations
connection
expression
functions
ops
expression_methods
macros
migration
mysql
connection
query_builder
types
query_builder
delete_statement
insert_statement
nodes
select_statement
update_statement
query_dsl
query_source
sql_types
type_impls
types
diesel_derives
diesel_migrations
dirs
dotenv
dtoa
either
encoding_rs
error_chain
failure
failure_derive
filetime
flate2
deflate
gz
zlib
fnv
foreign_types
foreign_types_shared
futures
future
sink
stream
and_then.rsbuffer_unordered.rsbuffered.rscatch_unwind.rschain.rschannel.rschunks.rscollect.rsconcat.rsempty.rsfilter.rsfilter_map.rsflatten.rsfold.rsfor_each.rsforward.rsfrom_err.rsfuse.rsfuture.rsfutures_ordered.rsfutures_unordered.rsinspect.rsinspect_err.rsiter.rsiter_ok.rsiter_result.rsmap.rsmap_err.rsmerge.rsmod.rsonce.rsor_else.rspeek.rspoll_fn.rsrepeat.rsselect.rsskip.rsskip_while.rssplit.rstake.rstake_while.rsthen.rsunfold.rswait.rszip.rs
sync
task_impl
unsync
futures_cpupool
gif
google_signin
gzip_header
h2
codec
frame
hpack
proto
http
http_body
httparse
hyper
body
client
common
proto
server
service
hyper_rustls
hyper_tls
idna
image
bmp
hdr
ico
imageops
jpeg
math
pnm
tga
utils
webp
indexmap
inflate
iovec
itoa
jpeg_decoder
language_tags
lazy_static
libc
unix
lock_api
log
lzw
matches
memchr
memoffset
migrations_internals
migrations_macros
mime
mime_guess
miniz_oxide
mio
deprecated
net
sys
multipart
mysqlclient_sys
native_tls
net2
nodrop
num_cpus
num_derive
num_integer
num_iter
num_rational
num_traits
openssl
openssl_probe
openssl_sys
ordered_float
owning_ref
parking_lot
parking_lot_core
percent_encoding
phf
phf_shared
png
proc_macro2
publicsuffix
quick_error
quote
r2d2
rand
distributions
prng
rngs
seq
rand_chacha
rand_core
rand_hc
rand_isaac
rand_jitter
rand_os
rand_pcg
rand_xorshift
rayon
collections
compile_fail
iter
chain.rschunks.rscloned.rscopied.rsempty.rsenumerate.rsextend.rsfilter.rsfilter_map.rsfind.rsflat_map.rsflatten.rsfold.rsfor_each.rsfrom_par_iter.rsinspect.rsinterleave.rsinterleave_shortest.rsintersperse.rslen.rsmap.rsmap_with.rsmod.rsnoop.rsonce.rspanic_fuse.rspar_bridge.rsproduct.rsreduce.rsrepeat.rsrev.rsskip.rssplitter.rssum.rstake.rstry_fold.rstry_reduce.rstry_reduce_with.rsunzip.rsupdate.rswhile_some.rszip.rszip_eq.rs
slice
rayon_core
compile_fail
join
scope
sleep
spawn
thread_pool
regex
regex_automata
regex_syntax
ast
hir
unicode_tables
remove_dir_all
reqwest
ring
aead
arithmetic
digest
ec
curve25519
suite_b
rsa
rouille
input
websocket
rustc_demangle
rustls
client
msgs
server
rusttype
ryu
safemem
scheduled_thread_pool
scoped_threadpool
scopeguard
sct
serde
de
private
ser
serde_derive
serde_json
serde_urlencoded
sha1
simplelog
siphasher
slab
smallvec
stable_deref_trait
stb_truetype
string
syn
attr.rsbuffer.rscustom_keyword.rscustom_punctuation.rsdata.rsderive.rsdiscouraged.rserror.rsexport.rsexpr.rsext.rsfile.rsgenerics.rsgroup.rsident.rsitem.rslib.rslifetime.rslit.rslookahead.rsmac.rsmacros.rsop.rsparse.rsparse_macro_input.rsparse_quote.rspath.rsprint.rspunctuated.rssealed.rsspan.rsspanned.rsthread.rstoken.rstt.rsty.rs
synom
synstructure
tempdir
term
terminfo
thread_local
threadpool
tiff
time
tiny_http
util
tokio
executor
reactor
runtime
util
tokio_buf
tokio_current_thread
tokio_executor
tokio_io
_tokio_codec
codec
io
tokio_reactor
tokio_sync
tokio_tcp
tokio_threadpool
park
pool
task
worker
tokio_timer
clock
timer
wheel
traitobject
try_from
try_lock
twoway
typeable
unicase
unicode_bidi
unicode_normalization
unicode_xid
untrusted
url
uuid
want
webdev_lib
chemicals
permissions
tests
question_categories
questions
test_sessions
tests
users
webpki
webpki_roots
>
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
//! Definition of the `LoopFn` combinator, implementing `Future` loops. use {Async, Future, IntoFuture, Poll}; /// The status of a `loop_fn` loop. #[derive(Debug)] pub enum Loop<T, S> { /// Indicates that the loop has completed with output `T`. Break(T), /// Indicates that the loop function should be called again with input /// state `S`. Continue(S), } /// A future implementing a tail-recursive loop. /// /// Created by the `loop_fn` function. #[derive(Debug)] pub struct LoopFn<A, F> where A: IntoFuture { future: A::Future, func: F, } /// Creates a new future implementing a tail-recursive loop. /// /// The loop function is immediately called with `initial_state` and should /// return a value that can be converted to a future. On successful completion, /// this future should output a `Loop<T, S>` to indicate the status of the /// loop. /// /// `Loop::Break(T)` halts the loop and completes the future with output `T`. /// /// `Loop::Continue(S)` reinvokes the loop function with state `S`. The returned /// future will be subsequently polled for a new `Loop<T, S>` value. /// /// # Examples /// /// ``` /// use futures::future::{ok, loop_fn, Future, FutureResult, Loop}; /// use std::io::Error; /// /// struct Client { /// ping_count: u8, /// } /// /// impl Client { /// fn new() -> Self { /// Client { ping_count: 0 } /// } /// /// fn send_ping(self) -> FutureResult<Self, Error> { /// ok(Client { ping_count: self.ping_count + 1 }) /// } /// /// fn receive_pong(self) -> FutureResult<(Self, bool), Error> { /// let done = self.ping_count >= 5; /// ok((self, done)) /// } /// } /// /// let ping_til_done = loop_fn(Client::new(), |client| { /// client.send_ping() /// .and_then(|client| client.receive_pong()) /// .and_then(|(client, done)| { /// if done { /// Ok(Loop::Break(client)) /// } else { /// Ok(Loop::Continue(client)) /// } /// }) /// }); /// ``` pub fn loop_fn<S, T, A, F>(initial_state: S, mut func: F) -> LoopFn<A, F> where F: FnMut(S) -> A, A: IntoFuture<Item = Loop<T, S>>, { LoopFn { future: func(initial_state).into_future(), func: func, } } impl<S, T, A, F> Future for LoopFn<A, F> where F: FnMut(S) -> A, A: IntoFuture<Item = Loop<T, S>>, { type Item = T; type Error = A::Error; fn poll(&mut self) -> Poll<Self::Item, Self::Error> { loop { match try_ready!(self.future.poll()) { Loop::Break(x) => return Ok(Async::Ready(x)), Loop::Continue(s) => self.future = (self.func)(s).into_future(), } } } }