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</pre><pre class="rust ">
<span class="doccomment">//! Zero-cost Futures in Rust</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This library is an implementation of futures in Rust which aims to provide</span>
<span class="doccomment">//! a robust implementation of handling asynchronous computations, ergonomic</span>
<span class="doccomment">//! composition and usage, and zero-cost abstractions over what would otherwise</span>
<span class="doccomment">//! be written by hand.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Futures are a concept for an object which is a proxy for another value that</span>
<span class="doccomment">//! may not be ready yet. For example issuing an HTTP request may return a</span>
<span class="doccomment">//! future for the HTTP response, as it probably hasn't arrived yet. With an</span>
<span class="doccomment">//! object representing a value that will eventually be available, futures allow</span>
<span class="doccomment">//! for powerful composition of tasks through basic combinators that can perform</span>
<span class="doccomment">//! operations like chaining computations, changing the types of futures, or</span>
<span class="doccomment">//! waiting for two futures to complete at the same time.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! You can find extensive tutorials and documentations at [https://tokio.rs]</span>
<span class="doccomment">//! for both this crate (asynchronous programming in general) as well as the</span>
<span class="doccomment">//! Tokio stack to perform async I/O with.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [https://tokio.rs]: https://tokio.rs</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Installation</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Add this to your `Cargo.toml`:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```toml</span>
<span class="doccomment">//! [dependencies]</span>
<span class="doccomment">//! futures = "0.1"</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Examples</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Let's take a look at a few examples of how futures might be used:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! extern crate futures;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! use std::io;</span>
<span class="doccomment">//! use std::time::Duration;</span>
<span class="doccomment">//! use futures::future::{Future, Map};</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // A future is actually a trait implementation, so we can generically take a</span>
<span class="doccomment">//! // future of any integer and return back a future that will resolve to that</span>
<span class="doccomment">//! // value plus 10 more.</span>
<span class="doccomment">//! //</span>
<span class="doccomment">//! // Note here that like iterators, we're returning the `Map` combinator in</span>
<span class="doccomment">//! // the futures crate, not a boxed abstraction. This is a zero-cost</span>
<span class="doccomment">//! // construction of a future.</span>
<span class="doccomment">//! fn add_ten<F>(future: F) -> Map<F, fn(i32) -> i32></span>
<span class="doccomment">//! where F: Future<Item=i32>,</span>
<span class="doccomment">//! {</span>
<span class="doccomment">//! fn add(a: i32) -> i32 { a + 10 }</span>
<span class="doccomment">//! future.map(add)</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // Not only can we modify one future, but we can even compose them together!</span>
<span class="doccomment">//! // Here we have a function which takes two futures as input, and returns a</span>
<span class="doccomment">//! // future that will calculate the sum of their two values.</span>
<span class="doccomment">//! //</span>
<span class="doccomment">//! // Above we saw a direct return value of the `Map` combinator, but</span>
<span class="doccomment">//! // performance isn't always critical and sometimes it's more ergonomic to</span>
<span class="doccomment">//! // return a trait object like we do here. Note though that there's only one</span>
<span class="doccomment">//! // allocation here, not any for the intermediate futures.</span>
<span class="doccomment">//! fn add<'a, A, B>(a: A, b: B) -> Box<Future<Item=i32, Error=A::Error> + 'a></span>
<span class="doccomment">//! where A: Future<Item=i32> + 'a,</span>
<span class="doccomment">//! B: Future<Item=i32, Error=A::Error> + 'a,</span>
<span class="doccomment">//! {</span>
<span class="doccomment">//! Box::new(a.join(b).map(|(a, b)| a + b))</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // Futures also allow chaining computations together, starting another after</span>
<span class="doccomment">//! // the previous finishes. Here we wait for the first computation to finish,</span>
<span class="doccomment">//! // and then decide what to do depending on the result.</span>
<span class="doccomment">//! fn download_timeout(url: &str,</span>
<span class="doccomment">//! timeout_dur: Duration)</span>
<span class="doccomment">//! -> Box<Future<Item=Vec<u8>, Error=io::Error>> {</span>
<span class="doccomment">//! use std::io;</span>
<span class="doccomment">//! use std::net::{SocketAddr, TcpStream};</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! type IoFuture<T> = Box<Future<Item=T, Error=io::Error>>;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // First thing to do is we need to resolve our URL to an address. This</span>
<span class="doccomment">//! // will likely perform a DNS lookup which may take some time.</span>
<span class="doccomment">//! let addr = resolve(url);</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // After we acquire the address, we next want to open up a TCP</span>
<span class="doccomment">//! // connection.</span>
<span class="doccomment">//! let tcp = addr.and_then(|addr| connect(&addr));</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // After the TCP connection is established and ready to go, we're off to</span>
<span class="doccomment">//! // the races!</span>
<span class="doccomment">//! let data = tcp.and_then(|conn| download(conn));</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // That all might take awhile, though, so let's not wait too long for it</span>
<span class="doccomment">//! // to all come back. The `select` combinator here returns a future which</span>
<span class="doccomment">//! // resolves to the first value that's ready plus the next future.</span>
<span class="doccomment">//! //</span>
<span class="doccomment">//! // Note we can also use the `then` combinator which is similar to</span>
<span class="doccomment">//! // `and_then` above except that it receives the result of the</span>
<span class="doccomment">//! // computation, not just the successful value.</span>
<span class="doccomment">//! //</span>
<span class="doccomment">//! // Again note that all the above calls to `and_then` and the below calls</span>
<span class="doccomment">//! // to `map` and such require no allocations. We only ever allocate once</span>
<span class="doccomment">//! // we hit the `Box::new()` call at the end here, which means we've built</span>
<span class="doccomment">//! // up a relatively involved computation with only one box, and even that</span>
<span class="doccomment">//! // was optional!</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let data = data.map(Ok);</span>
<span class="doccomment">//! let timeout = timeout(timeout_dur).map(Err);</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let ret = data.select(timeout).then(|result| {</span>
<span class="doccomment">//! match result {</span>
<span class="doccomment">//! // One future succeeded, and it was the one which was</span>
<span class="doccomment">//! // downloading data from the connection.</span>
<span class="doccomment">//! Ok((Ok(data), _other_future)) => Ok(data),</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // The timeout fired, and otherwise no error was found, so</span>
<span class="doccomment">//! // we translate this to an error.</span>
<span class="doccomment">//! Ok((Err(_timeout), _other_future)) => {</span>
<span class="doccomment">//! Err(io::Error::new(io::ErrorKind::Other, "timeout"))</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // A normal I/O error happened, so we pass that on through.</span>
<span class="doccomment">//! Err((e, _other_future)) => Err(e),</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! });</span>
<span class="doccomment">//! return Box::new(ret);</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn resolve(url: &str) -> IoFuture<SocketAddr> {</span>
<span class="doccomment">//! // ...</span>
<span class="doccomment">//! # panic!("unimplemented");</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn connect(hostname: &SocketAddr) -> IoFuture<TcpStream> {</span>
<span class="doccomment">//! // ...</span>
<span class="doccomment">//! # panic!("unimplemented");</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn download(stream: TcpStream) -> IoFuture<Vec<u8>> {</span>
<span class="doccomment">//! // ...</span>
<span class="doccomment">//! # panic!("unimplemented");</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn timeout(stream: Duration) -> IoFuture<()> {</span>
<span class="doccomment">//! // ...</span>
<span class="doccomment">//! # panic!("unimplemented");</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! # fn main() {}</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Some more information can also be found in the [README] for now, but</span>
<span class="doccomment">//! otherwise feel free to jump in to the docs below!</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [README]: https://github.com/alexcrichton/futures-rs#futures-rs</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">no_std</span>]</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">deny</span>(<span class="ident">missing_docs</span>, <span class="ident">missing_debug_implementations</span>)]</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">doc</span>(<span class="ident">html_root_url</span> <span class="op">=</span> <span class="string">"https://docs.rs/futures/0.1"</span>)]</span>
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">std</span>;
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">if_std</span> {
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">item</span>)<span class="kw-2">*</span>) <span class="op">=></span> ($(
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>
)<span class="kw-2">*</span>)
}
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">mod</span> <span class="ident">poll</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">poll</span>::{<span class="ident">Poll</span>, <span class="ident">Async</span>, <span class="ident">AsyncSink</span>, <span class="ident">StartSend</span>};
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">future</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">future</span>::{<span class="ident">Future</span>, <span class="ident">IntoFuture</span>};
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">stream</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">stream</span>::<span class="ident">Stream</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">sink</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">sink</span>::<span class="ident">Sink</span>;
<span class="attribute">#[<span class="ident">deprecated</span>(<span class="ident">since</span> <span class="op">=</span> <span class="string">"0.1.4"</span>, <span class="ident">note</span> <span class="op">=</span> <span class="string">"import through the future module instead"</span>)]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"with-deprecated"</span>)]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">future</span>::{<span class="ident">done</span>, <span class="ident">empty</span>, <span class="ident">failed</span>, <span class="ident">finished</span>, <span class="ident">lazy</span>};
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"with-deprecated"</span>)]</span>
<span class="attribute">#[<span class="ident">deprecated</span>(<span class="ident">since</span> <span class="op">=</span> <span class="string">"0.1.4"</span>, <span class="ident">note</span> <span class="op">=</span> <span class="string">"import through the future module instead"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">future</span>::{
<span class="ident">Done</span>, <span class="ident">Empty</span>, <span class="ident">Failed</span>, <span class="ident">Finished</span>, <span class="ident">Lazy</span>, <span class="ident">AndThen</span>, <span class="ident">Flatten</span>, <span class="ident">FlattenStream</span>, <span class="ident">Fuse</span>, <span class="ident">IntoStream</span>,
<span class="ident">Join</span>, <span class="ident">Join3</span>, <span class="ident">Join4</span>, <span class="ident">Join5</span>, <span class="ident">Map</span>, <span class="ident">MapErr</span>, <span class="ident">OrElse</span>, <span class="ident">Select</span>,
<span class="ident">SelectNext</span>, <span class="ident">Then</span>
};
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">mod</span> <span class="ident">lock</span>;
<span class="kw">mod</span> <span class="ident">task_impl</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">task</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">executor</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">sync</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_std"</span>)]</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">unsync</span>;
<span class="macro">if_std</span><span class="macro">!</span> {
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">deprecated</span>(<span class="ident">since</span> <span class="op">=</span> <span class="string">"0.1.4"</span>, <span class="ident">note</span> <span class="op">=</span> <span class="string">"use sync::oneshot::channel instead"</span>)]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"with-deprecated"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">sync</span>::<span class="ident">oneshot</span>::<span class="ident">channel</span> <span class="kw">as</span> <span class="ident">oneshot</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">deprecated</span>(<span class="ident">since</span> <span class="op">=</span> <span class="string">"0.1.4"</span>, <span class="ident">note</span> <span class="op">=</span> <span class="string">"use sync::oneshot::Receiver instead"</span>)]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"with-deprecated"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">sync</span>::<span class="ident">oneshot</span>::<span class="ident">Receiver</span> <span class="kw">as</span> <span class="ident">Oneshot</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">deprecated</span>(<span class="ident">since</span> <span class="op">=</span> <span class="string">"0.1.4"</span>, <span class="ident">note</span> <span class="op">=</span> <span class="string">"use sync::oneshot::Sender instead"</span>)]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"with-deprecated"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">sync</span>::<span class="ident">oneshot</span>::<span class="ident">Sender</span> <span class="kw">as</span> <span class="ident">Complete</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">deprecated</span>(<span class="ident">since</span> <span class="op">=</span> <span class="string">"0.1.4"</span>, <span class="ident">note</span> <span class="op">=</span> <span class="string">"use sync::oneshot::Canceled instead"</span>)]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"with-deprecated"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">sync</span>::<span class="ident">oneshot</span>::<span class="ident">Canceled</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">deprecated</span>(<span class="ident">since</span> <span class="op">=</span> <span class="string">"0.1.4"</span>, <span class="ident">note</span> <span class="op">=</span> <span class="string">"import through the future module instead"</span>)]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"with-deprecated"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">future</span>::{<span class="ident">BoxFuture</span>, <span class="ident">collect</span>, <span class="ident">select_all</span>, <span class="ident">select_ok</span>};
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">deprecated</span>(<span class="ident">since</span> <span class="op">=</span> <span class="string">"0.1.4"</span>, <span class="ident">note</span> <span class="op">=</span> <span class="string">"import through the future module instead"</span>)]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"with-deprecated"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">future</span>::{<span class="ident">SelectAll</span>, <span class="ident">SelectAllNext</span>, <span class="ident">Collect</span>, <span class="ident">SelectOk</span>};
}
</pre>
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