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| author | 2015-06-29 20:16:15 +0000 | |
|---|---|---|
| committer | 2015-06-29 20:16:15 +0000 | |
| commit | 64106c4d3d4ddba8c7bc2af75376e6d3d3d75601 (patch) | |
| tree | 8c64d6e8be006486d975a651505fbbde61365cd6 /src/carboxyl/stream.rs.html | |
| download | irsc-64106c4d3d4ddba8c7bc2af75376e6d3d3d75601.tar.gz irsc-64106c4d3d4ddba8c7bc2af75376e6d3d3d75601.tar.xz irsc-64106c4d3d4ddba8c7bc2af75376e6d3d3d75601.zip | |
Update documentationgh-pages
Diffstat (limited to 'src/carboxyl/stream.rs.html')
| -rw-r--r-- | src/carboxyl/stream.rs.html | 1645 |
1 files changed, 1645 insertions, 0 deletions
diff --git a/src/carboxyl/stream.rs.html b/src/carboxyl/stream.rs.html new file mode 100644 index 0000000..8290275 --- /dev/null +++ b/src/carboxyl/stream.rs.html @@ -0,0 +1,1645 @@ +<!DOCTYPE html> +<html lang="en"> +<head> + <meta charset="utf-8"> + <meta name="viewport" content="width=device-width, initial-scale=1.0"> + <meta name="generator" content="rustdoc"> + <meta name="description" content="Source to the Rust file `/home/travis/.cargo/registry/src/github.com-0a35038f75765ae4/carboxyl-0.1.1/src/stream.rs`."> + <meta name="keywords" content="rust, rustlang, rust-lang"> + + <title>stream.rs.html -- source</title> + + <link rel="stylesheet" type="text/css" href="../../main.css"> + + + +</head> +<body class="rustdoc"> + <!--[if lte IE 8]> + <div class="warning"> + This old browser is unsupported and will most likely display funky + things. + </div> + <![endif]--> + + + + <section class="sidebar"> + + + </section> + + <nav class="sub"> + <form class="search-form js-only"> + <div class="search-container"> + <input class="search-input" name="search" + autocomplete="off" + placeholder="Click or press 'S' to search, '?' for more options..." + type="search"> + </div> + </form> + </nav> + + <section id='main' class="content source"><pre class="line-numbers"><span id="1"> 1</span> +<span id="2"> 2</span> +<span id="3"> 3</span> +<span id="4"> 4</span> +<span id="5"> 5</span> +<span id="6"> 6</span> +<span id="7"> 7</span> +<span id="8"> 8</span> +<span id="9"> 9</span> +<span id="10"> 10</span> +<span id="11"> 11</span> +<span id="12"> 12</span> +<span id="13"> 13</span> +<span id="14"> 14</span> +<span id="15"> 15</span> +<span id="16"> 16</span> +<span id="17"> 17</span> +<span id="18"> 18</span> +<span id="19"> 19</span> +<span id="20"> 20</span> +<span id="21"> 21</span> +<span id="22"> 22</span> +<span id="23"> 23</span> +<span id="24"> 24</span> +<span id="25"> 25</span> +<span id="26"> 26</span> +<span id="27"> 27</span> +<span id="28"> 28</span> +<span 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id="660">660</span> +<span id="661">661</span> +<span id="662">662</span> +<span id="663">663</span> +<span id="664">664</span> +<span id="665">665</span> +<span id="666">666</span> +<span id="667">667</span> +<span id="668">668</span> +<span id="669">669</span> +<span id="670">670</span> +<span id="671">671</span> +<span id="672">672</span> +<span id="673">673</span> +<span id="674">674</span> +<span id="675">675</span> +<span id="676">676</span> +<span id="677">677</span> +<span id="678">678</span> +<span id="679">679</span> +<span id="680">680</span> +<span id="681">681</span> +<span id="682">682</span> +<span id="683">683</span> +<span id="684">684</span> +<span id="685">685</span> +<span id="686">686</span> +<span id="687">687</span> +<span id="688">688</span> +<span id="689">689</span> +<span id="690">690</span> +<span id="691">691</span> +<span id="692">692</span> +<span id="693">693</span> +<span id="694">694</span> +<span id="695">695</span> +<span id="696">696</span> +<span id="697">697</span> +<span id="698">698</span> +<span id="699">699</span> +<span id="700">700</span> +<span id="701">701</span> +<span id="702">702</span> +<span id="703">703</span> +<span id="704">704</span> +<span id="705">705</span> +<span id="706">706</span> +<span id="707">707</span> +<span id="708">708</span> +<span id="709">709</span> +<span id="710">710</span> +<span id="711">711</span> +<span id="712">712</span> +<span id="713">713</span> +<span id="714">714</span> +<span id="715">715</span> +<span id="716">716</span> +<span id="717">717</span> +<span id="718">718</span> +<span id="719">719</span> +<span id="720">720</span> +<span id="721">721</span> +<span id="722">722</span> +<span id="723">723</span> +<span id="724">724</span> +<span id="725">725</span> +<span id="726">726</span> +<span id="727">727</span> +<span id="728">728</span> +<span id="729">729</span> +<span id="730">730</span> +<span id="731">731</span> +<span id="732">732</span> +<span id="733">733</span> +<span id="734">734</span> +<span id="735">735</span> +<span id="736">736</span> +<span id="737">737</span> +<span id="738">738</span> +<span id="739">739</span> +<span id="740">740</span> +<span id="741">741</span> +<span id="742">742</span> +<span id="743">743</span> +<span id="744">744</span> +<span id="745">745</span> +<span id="746">746</span> +<span id="747">747</span> +<span id="748">748</span> +<span id="749">749</span> +<span id="750">750</span> +<span id="751">751</span> +<span id="752">752</span> +<span id="753">753</span> +<span id="754">754</span> +<span id="755">755</span> +<span id="756">756</span> +<span id="757">757</span> +<span id="758">758</span> +<span id="759">759</span> +<span id="760">760</span> +<span id="761">761</span> +<span id="762">762</span> +<span id="763">763</span> +<span id="764">764</span> +<span id="765">765</span> +<span id="766">766</span> +<span id="767">767</span> +<span id="768">768</span> +<span id="769">769</span> +<span id="770">770</span> +<span id="771">771</span> +<span id="772">772</span> +<span id="773">773</span> +<span id="774">774</span> +</pre><pre class='rust '> +<span class='doccomment'>//! Streams of discrete events</span> + +<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::{ <span class='ident'>Arc</span>, <span class='ident'>RwLock</span>, <span class='ident'>Mutex</span>, <span class='ident'>Weak</span> }; +<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::<span class='ident'>mpsc</span>::{ <span class='ident'>Receiver</span>, <span class='ident'>channel</span> }; +<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>thread</span>; +<span class='kw'>use</span> <span class='ident'>source</span>::{ <span class='ident'>Source</span>, <span class='ident'>CallbackError</span>, <span class='ident'>CallbackResult</span>, <span class='ident'>with_weak</span> }; +<span class='kw'>use</span> <span class='ident'>signal</span>::{ <span class='self'>self</span>, <span class='ident'>Signal</span>, <span class='ident'>SignalMut</span>, <span class='ident'>sample_raw</span> }; +<span class='kw'>use</span> <span class='ident'>transaction</span>::{ <span class='ident'>commit</span>, <span class='ident'>later</span> }; + + +<span class='doccomment'>/// An event sink.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// This primitive is a way of generating streams of events. One can send</span> +<span class='doccomment'>/// input values into a sink and generate a stream that fires all these inputs</span> +<span class='doccomment'>/// as events:</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// ```</span> +<span class='doccomment'>/// # use carboxyl::Sink;</span> +<span class='doccomment'>/// // A new sink</span> +<span class='doccomment'>/// let sink = Sink::new();</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// // Make an iterator over a stream.</span> +<span class='doccomment'>/// let mut events = sink.stream().events();</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// // Send a value into the sink</span> +<span class='doccomment'>/// sink.send(5);</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// // The stream</span> +<span class='doccomment'>/// assert_eq!(events.next(), Some(5));</span> +<span class='doccomment'>/// ```</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// You can also feed a sink with an iterator:</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// ```</span> +<span class='doccomment'>/// # use carboxyl::Sink;</span> +<span class='doccomment'>/// # let sink = Sink::new();</span> +<span class='doccomment'>/// # let mut events = sink.stream().events();</span> +<span class='doccomment'>/// sink.feed(20..40);</span> +<span class='doccomment'>/// assert_eq!(events.take(4).collect::<Vec<_>>(), vec![20, 21, 22, 23]);</span> +<span class='doccomment'>/// ```</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// # Asynchronous calls</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// It is possible to send events into the sink asynchronously using the methods</span> +<span class='doccomment'>/// `send_async` and `feed_async`. Note though, that this will void some</span> +<span class='doccomment'>/// guarantees on the order of events. In the following example, it is unclear,</span> +<span class='doccomment'>/// which event is the first in the stream:</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// ```</span> +<span class='doccomment'>/// # use carboxyl::Sink;</span> +<span class='doccomment'>/// let sink = Sink::new();</span> +<span class='doccomment'>/// let mut events = sink.stream().events();</span> +<span class='doccomment'>/// sink.send_async(13);</span> +<span class='doccomment'>/// sink.send_async(22);</span> +<span class='doccomment'>/// let first = events.next().unwrap();</span> +<span class='doccomment'>/// assert!(first == 13 || first == 22);</span> +<span class='doccomment'>/// ```</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// `feed_async` provides a workaround, as it preserves the order of events from</span> +<span class='doccomment'>/// the iterator. However, any event sent into the sink after a call to it, may</span> +<span class='doccomment'>/// come at any point between the iterator events.</span> +<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Sink</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>source</span>: <span class='ident'>Arc</span><span class='op'><</span><span class='ident'>RwLock</span><span class='op'><</span><span class='ident'>Source</span><span class='op'><</span><span class='ident'>A</span><span class='op'>>></span><span class='op'>></span>, +} + +<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> <span class='ident'>Clone</span> <span class='kw'>for</span> <span class='ident'>Sink</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='kw'>fn</span> <span class='ident'>clone</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>Sink</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>Sink</span> { <span class='ident'>source</span>: <span class='self'>self</span>.<span class='ident'>source</span>.<span class='ident'>clone</span>() } + } +} + +<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span><span class='op'>></span> <span class='ident'>Sink</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='doccomment'>/// Create a new sink.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-></span> <span class='ident'>Sink</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>Sink</span> { <span class='ident'>source</span>: <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>Source</span>::<span class='ident'>new</span>())) } + } + + <span class='doccomment'>/// Generate a stream that fires all events sent into the sink.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>stream</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>Stream</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>Stream</span> { <span class='ident'>source</span>: <span class='self'>self</span>.<span class='ident'>source</span>.<span class='ident'>clone</span>(), <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(()), } + } +} + +<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>'static</span><span class='op'>></span> <span class='ident'>Sink</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='doccomment'>/// Asynchronous send.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// Same as `send`, but it spawns a new thread to process the updates to</span> + <span class='doccomment'>/// dependent streams and signals.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>send_async</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>a</span>: <span class='ident'>A</span>) { + <span class='kw'>let</span> <span class='ident'>clone</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>clone</span>(); + <span class='ident'>thread</span>::<span class='ident'>spawn</span>(<span class='kw'>move</span> <span class='op'>||</span> <span class='ident'>clone</span>.<span class='ident'>send</span>(<span class='ident'>a</span>)); + } + + <span class='doccomment'>/// Feed values from an iterator into the sink.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// This method feeds events into the sink from an iterator.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>feed</span><span class='op'><</span><span class='ident'>I</span>: <span class='ident'>IntoIterator</span><span class='op'><</span><span class='ident'>Item</span><span class='op'>=</span><span class='ident'>A</span><span class='op'>>></span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>iterator</span>: <span class='ident'>I</span>) { + <span class='kw'>for</span> <span class='ident'>event</span> <span class='kw'>in</span> <span class='ident'>iterator</span> { + <span class='self'>self</span>.<span class='ident'>send</span>(<span class='ident'>event</span>); + } + } + + <span class='doccomment'>/// Asynchronous feed.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// This is the same as `feed`, but it does not block, since it spawns the</span> + <span class='doccomment'>/// feeding as a new task. This is useful, if the provided iterator is large</span> + <span class='doccomment'>/// or even infinite (e.g. an I/O event loop).</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>feed_async</span><span class='op'><</span><span class='ident'>I</span>: <span class='ident'>IntoIterator</span><span class='op'><</span><span class='ident'>Item</span><span class='op'>=</span><span class='ident'>A</span><span class='op'>></span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='lifetime'>'static</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>iterator</span>: <span class='ident'>I</span>) { + <span class='kw'>let</span> <span class='ident'>clone</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>clone</span>(); + <span class='ident'>thread</span>::<span class='ident'>spawn</span>(<span class='kw'>move</span> <span class='op'>||</span> <span class='ident'>clone</span>.<span class='ident'>feed</span>(<span class='ident'>iterator</span>)); + } + + <span class='doccomment'>/// Send a value into the sink.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// When a value is sent into the sink, an event is fired in all dependent</span> + <span class='doccomment'>/// streams.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>send</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>a</span>: <span class='ident'>A</span>) { + <span class='ident'>commit</span>(<span class='op'>||</span> <span class='self'>self</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>().<span class='ident'>send</span>(<span class='ident'>a</span>)) + } +} + + +<span class='doccomment'>/// Trait to wrap cloning of boxed values in a object-safe manner</span> +<span class='kw'>pub</span> <span class='kw'>trait</span> <span class='ident'>BoxClone</span>: <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Send</span> { + <span class='doccomment'>/// Clone the object as a boxed trait object</span> + <span class='kw'>fn</span> <span class='ident'>box_clone</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>Box</span><span class='op'><</span><span class='ident'>BoxClone</span><span class='op'>></span>; +} + +<span class='kw'>impl</span><span class='op'><</span><span class='ident'>T</span>: <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>'static</span><span class='op'>></span> <span class='ident'>BoxClone</span> <span class='kw'>for</span> <span class='ident'>T</span> { + <span class='kw'>fn</span> <span class='ident'>box_clone</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>Box</span><span class='op'><</span><span class='ident'>BoxClone</span><span class='op'>></span> { + <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='self'>self</span>.<span class='ident'>clone</span>()) + } +} + + +<span class='doccomment'>/// Access a stream's source.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// This is not defined as a method, so that it can be public to other modules</span> +<span class='doccomment'>/// in this crate while being private outside the crate.</span> +<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>source</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span>(<span class='ident'>stream</span>: <span class='kw-2'>&</span><span class='ident'>Stream</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='ident'>Arc</span><span class='op'><</span><span class='ident'>RwLock</span><span class='op'><</span><span class='ident'>Source</span><span class='op'><</span><span class='ident'>A</span><span class='op'>>></span><span class='op'>></span> { + <span class='kw-2'>&</span><span class='ident'>stream</span>.<span class='ident'>source</span> +} + + +<span class='doccomment'>/// A stream of events.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// Conceptually a stream can be thought of as a series of discrete events that</span> +<span class='doccomment'>/// occur at specific times. They are ordered by a transaction system. This</span> +<span class='doccomment'>/// means that firings of disjoint events can not interfere with each other. The</span> +<span class='doccomment'>/// consequences of one event are atomically reflected in dependent quantities.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// Streams provide a number of primitive operations. These can be used to</span> +<span class='doccomment'>/// compose streams and combine them with signals. For instance, streams can be</span> +<span class='doccomment'>/// mapped over with a function, merged with another stream of the same type or</span> +<span class='doccomment'>/// filtered by some predicate.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// # Algebraic laws</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// Furthermore, streams satisfy certain algebraic properties that are useful to</span> +<span class='doccomment'>/// reason about them.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// ## Monoid</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// For once, streams of the same type form a **monoid** under merging. The</span> +<span class='doccomment'>/// neutral element in this context is `Stream::never()`. So the following laws</span> +<span class='doccomment'>/// always hold for streams `a`, `b` and `c` of the same type:</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// - Left identity: `Stream::never().merge(&a) == a`,</span> +<span class='doccomment'>/// - Right identity: `a.merge(&Stream::never()) == a`,</span> +<span class='doccomment'>/// - Associativity: `a.merge(&b).merge(&c) == a.merge(&b.merge(&c))`.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// *Note that equality in this context is not actually implemented as such,</span> +<span class='doccomment'>/// since comparing two (potentially infinite) streams is a prohibitive</span> +<span class='doccomment'>/// operation. Instead, the expressions above can be used interchangably and</span> +<span class='doccomment'>/// behave identically.*</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// ## Functor</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// Under the mapping operation streams also become a functor. A functor is a</span> +<span class='doccomment'>/// generic type like `Stream` with some mapping operation that takes a function</span> +<span class='doccomment'>/// `Fn(A) -> B` to map a `Stream<A>` to a `Stream<B>`. Algebraically it</span> +<span class='doccomment'>/// satisfies the following laws:</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// - The identity function is preserved: `a.map(|x| x) == a`,</span> +<span class='doccomment'>/// - Function composition is respected: `a.map(f).map(g) == a.map(|x| g(f(x)))`.</span> +<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Stream</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>source</span>: <span class='ident'>Arc</span><span class='op'><</span><span class='ident'>RwLock</span><span class='op'><</span><span class='ident'>Source</span><span class='op'><</span><span class='ident'>A</span><span class='op'>>></span><span class='op'>></span>, + <span class='attribute'>#[<span class='ident'>allow</span>(<span class='ident'>dead_code</span>)]</span> + <span class='ident'>keep_alive</span>: <span class='ident'>Box</span><span class='op'><</span><span class='ident'>BoxClone</span><span class='op'>></span>, +} + +<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> <span class='ident'>Clone</span> <span class='kw'>for</span> <span class='ident'>Stream</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='kw'>fn</span> <span class='ident'>clone</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>Stream</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>Stream</span> { + <span class='ident'>source</span>: <span class='self'>self</span>.<span class='ident'>source</span>.<span class='ident'>clone</span>(), + <span class='ident'>keep_alive</span>: <span class='self'>self</span>.<span class='ident'>keep_alive</span>.<span class='ident'>box_clone</span>(), + } + } +} + +<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>'static</span><span class='op'>></span> <span class='ident'>Stream</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='doccomment'>/// Create a stream that never fires. This can be useful in certain</span> + <span class='doccomment'>/// situations, where a stream is logically required, but no events are</span> + <span class='doccomment'>/// expected.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>never</span>() <span class='op'>-></span> <span class='ident'>Stream</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>Stream</span> { + <span class='ident'>source</span>: <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>Source</span>::<span class='ident'>new</span>())), + <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(()) + } + } + + <span class='doccomment'>/// Map the stream to another stream using a function.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// `map` applies a function to every event fired in this stream to create a</span> + <span class='doccomment'>/// new stream of type `B`.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// ```</span> + <span class='doccomment'>/// # use carboxyl::Sink;</span> + <span class='doccomment'>/// let sink: Sink<i32> = Sink::new();</span> + <span class='doccomment'>/// let mut events = sink.stream().map(|x| x + 4).events();</span> + <span class='doccomment'>/// sink.send(3);</span> + <span class='doccomment'>/// assert_eq!(events.next(), Some(7));</span> + <span class='doccomment'>/// ```</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>map</span><span class='op'><</span><span class='ident'>B</span>, <span class='ident'>F</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-></span> <span class='ident'>Stream</span><span class='op'><</span><span class='ident'>B</span><span class='op'>></span> + <span class='kw'>where</span> <span class='ident'>B</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>'static</span>, + <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='ident'>A</span>) <span class='op'>-></span> <span class='ident'>B</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>'static</span>, + { + <span class='ident'>commit</span>(<span class='op'>||</span> { + <span class='kw'>let</span> <span class='ident'>src</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>Source</span>::<span class='ident'>new</span>())); + <span class='kw'>let</span> <span class='ident'>weak</span> <span class='op'>=</span> <span class='ident'>src</span>.<span class='ident'>downgrade</span>(); + <span class='self'>self</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>() + .<span class='ident'>register</span>(<span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> <span class='ident'>with_weak</span>(<span class='kw-2'>&</span><span class='ident'>weak</span>, <span class='op'>|</span><span class='ident'>src</span><span class='op'>|</span> <span class='ident'>src</span>.<span class='ident'>send</span>(<span class='ident'>f</span>(<span class='ident'>a</span>)))); + <span class='ident'>Stream</span> { + <span class='ident'>source</span>: <span class='ident'>src</span>, + <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='self'>self</span>.<span class='ident'>clone</span>()), + } + }) + } + + <span class='doccomment'>/// Filter a stream according to a predicate.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// `filter` creates a new stream that only fires those events from the</span> + <span class='doccomment'>/// original stream that satisfy the predicate.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// ```</span> + <span class='doccomment'>/// # use carboxyl::Sink;</span> + <span class='doccomment'>/// let sink: Sink<i32> = Sink::new();</span> + <span class='doccomment'>/// let mut events = sink.stream()</span> + <span class='doccomment'>/// .filter(|&x| (x >= 4) && (x <= 10))</span> + <span class='doccomment'>/// .events();</span> + <span class='doccomment'>/// sink.send(2); // won't arrive</span> + <span class='doccomment'>/// sink.send(5); // will arrive</span> + <span class='doccomment'>/// assert_eq!(events.next(), Some(5));</span> + <span class='doccomment'>/// ```</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>filter</span><span class='op'><</span><span class='ident'>F</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-></span> <span class='ident'>Stream</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> + <span class='kw'>where</span> <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='kw-2'>&</span><span class='ident'>A</span>) <span class='op'>-></span> <span class='ident'>bool</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>'static</span>, + { + <span class='self'>self</span>.<span class='ident'>filter_map</span>(<span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> <span class='kw'>if</span> <span class='ident'>f</span>(<span class='kw-2'>&</span><span class='ident'>a</span>) { <span class='prelude-val'>Some</span>(<span class='ident'>a</span>) } <span class='kw'>else</span> { <span class='prelude-val'>None</span> }) + } + + <span class='doccomment'>/// Both filter and map a stream.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// This is equivalent to `.map(f).filter_some()`.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// ```</span> + <span class='doccomment'>/// # use carboxyl::Sink;</span> + <span class='doccomment'>/// let sink = Sink::new();</span> + <span class='doccomment'>/// let mut events = sink.stream()</span> + <span class='doccomment'>/// .filter_map(|i| if i > 3 { Some(i + 2) } else { None })</span> + <span class='doccomment'>/// .events();</span> + <span class='doccomment'>/// sink.send(2);</span> + <span class='doccomment'>/// sink.send(4);</span> + <span class='doccomment'>/// assert_eq!(events.next(), Some(6));</span> + <span class='doccomment'>/// ```</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>filter_map</span><span class='op'><</span><span class='ident'>B</span>, <span class='ident'>F</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-></span> <span class='ident'>Stream</span><span class='op'><</span><span class='ident'>B</span><span class='op'>></span> + <span class='kw'>where</span> <span class='ident'>B</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>'static</span>, + <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='ident'>A</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>B</span><span class='op'>></span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>'static</span>, + { + <span class='self'>self</span>.<span class='ident'>map</span>(<span class='ident'>f</span>).<span class='ident'>filter_some</span>() + } + + <span class='doccomment'>/// Merge with another stream.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// `merge` takes two streams and creates a new stream that fires events</span> + <span class='doccomment'>/// from both input streams.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// ```</span> + <span class='doccomment'>/// # use carboxyl::Sink;</span> + <span class='doccomment'>/// let sink_1 = Sink::<i32>::new();</span> + <span class='doccomment'>/// let sink_2 = Sink::<i32>::new();</span> + <span class='doccomment'>/// let mut events = sink_1.stream().merge(&sink_2.stream()).events();</span> + <span class='doccomment'>/// sink_1.send(2);</span> + <span class='doccomment'>/// assert_eq!(events.next(), Some(2));</span> + <span class='doccomment'>/// sink_2.send(4);</span> + <span class='doccomment'>/// assert_eq!(events.next(), Some(4));</span> + <span class='doccomment'>/// ```</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>merge</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&</span><span class='ident'>Stream</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span>) <span class='op'>-></span> <span class='ident'>Stream</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>commit</span>(<span class='op'>||</span> { + <span class='kw'>let</span> <span class='ident'>src</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>Source</span>::<span class='ident'>new</span>())); + <span class='kw'>for</span> <span class='ident'>parent</span> <span class='kw'>in</span> [<span class='self'>self</span>, <span class='ident'>other</span>].<span class='ident'>iter</span>() { + <span class='kw'>let</span> <span class='ident'>weak</span> <span class='op'>=</span> <span class='ident'>src</span>.<span class='ident'>downgrade</span>(); + <span class='ident'>parent</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>() + .<span class='ident'>register</span>(<span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> <span class='ident'>with_weak</span>(<span class='kw-2'>&</span><span class='ident'>weak</span>, <span class='op'>|</span><span class='ident'>src</span><span class='op'>|</span> <span class='ident'>src</span>.<span class='ident'>send</span>(<span class='ident'>a</span>))); + } + <span class='ident'>Stream</span> { + <span class='ident'>source</span>: <span class='ident'>src</span>, + <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>((<span class='self'>self</span>.<span class='ident'>clone</span>(), <span class='ident'>other</span>.<span class='ident'>clone</span>())), + } + }) + } + + <span class='doccomment'>/// Coalesce multiple event firings within the same transaction into a</span> + <span class='doccomment'>/// single event.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// The function should ideally commute, as the order of events within a</span> + <span class='doccomment'>/// transaction is not well-defined.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>coalesce</span><span class='op'><</span><span class='ident'>F</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-></span> <span class='ident'>Stream</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> + <span class='kw'>where</span> <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='ident'>A</span>, <span class='ident'>A</span>) <span class='op'>-></span> <span class='ident'>A</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>'static</span>, + { + <span class='ident'>commit</span>(<span class='op'>||</span> { + <span class='kw'>let</span> <span class='ident'>src</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>Source</span>::<span class='ident'>new</span>())); + <span class='kw'>let</span> <span class='ident'>weak</span> <span class='op'>=</span> <span class='ident'>src</span>.<span class='ident'>downgrade</span>(); + <span class='self'>self</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>().<span class='ident'>register</span>({ + <span class='kw'>let</span> <span class='ident'>mutex</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>Mutex</span>::<span class='ident'>new</span>(<span class='prelude-val'>None</span>)); + <span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> { + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>inner</span> <span class='op'>=</span> <span class='ident'>mutex</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>(); + <span class='op'>*</span><span class='ident'>inner</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='kw'>match</span> <span class='ident'>inner</span>.<span class='ident'>take</span>() { + <span class='prelude-val'>Some</span>(<span class='ident'>b</span>) <span class='op'>=></span> <span class='ident'>f</span>(<span class='ident'>a</span>, <span class='ident'>b</span>), + <span class='prelude-val'>None</span> <span class='op'>=></span> <span class='ident'>a</span>, + }); + <span class='comment'>// Send the updated value later</span> + <span class='ident'>later</span>({ + <span class='kw'>let</span> <span class='ident'>mutex</span> <span class='op'>=</span> <span class='ident'>mutex</span>.<span class='ident'>clone</span>(); + <span class='kw'>let</span> <span class='ident'>weak</span> <span class='op'>=</span> <span class='ident'>weak</span>.<span class='ident'>clone</span>(); + <span class='kw'>move</span> <span class='op'>||</span> { + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>inner</span> <span class='op'>=</span> <span class='ident'>mutex</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>(); + <span class='comment'>// Take it out and map, so that it does not happen twice</span> + <span class='ident'>inner</span>.<span class='ident'>take</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>value</span><span class='op'>|</span> + <span class='ident'>with_weak</span>(<span class='kw-2'>&</span><span class='ident'>weak</span>, <span class='op'>|</span><span class='ident'>src</span><span class='op'>|</span> <span class='ident'>src</span>.<span class='ident'>send</span>(<span class='ident'>value</span>)) + ); + } + }); + <span class='prelude-val'>Ok</span>(()) + } + }); + <span class='ident'>Stream</span> { <span class='ident'>source</span>: <span class='ident'>src</span>, <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='self'>self</span>.<span class='ident'>clone</span>()) } + }) + } + + <span class='doccomment'>/// Hold an event in a signal.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// The resulting signal `hold`s the value of the last event fired by the</span> + <span class='doccomment'>/// stream.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// ```</span> + <span class='doccomment'>/// # use carboxyl::Sink;</span> + <span class='doccomment'>/// let sink = Sink::new();</span> + <span class='doccomment'>/// let signal = sink.stream().hold(0);</span> + <span class='doccomment'>/// assert_eq!(signal.sample(), 0);</span> + <span class='doccomment'>/// sink.send(2);</span> + <span class='doccomment'>/// assert_eq!(signal.sample(), 2);</span> + <span class='doccomment'>/// ```</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>hold</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>initial</span>: <span class='ident'>A</span>) <span class='op'>-></span> <span class='ident'>Signal</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>signal</span>::<span class='ident'>hold</span>(<span class='ident'>initial</span>, <span class='self'>self</span>) + } + + <span class='doccomment'>/// A blocking iterator over the stream.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>events</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>Events</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { <span class='ident'>Events</span>::<span class='ident'>new</span>(<span class='self'>self</span>) } + + <span class='doccomment'>/// Scan a stream and accumulate its event firings in a signal.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// Starting at some initial value, each new event changes the value of the</span> + <span class='doccomment'>/// resulting signal as prescribed by the supplied function.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// ```</span> + <span class='doccomment'>/// # use carboxyl::Sink;</span> + <span class='doccomment'>/// let sink = Sink::new();</span> + <span class='doccomment'>/// let sum = sink.stream().scan(0, |a, b| a + b);</span> + <span class='doccomment'>/// assert_eq!(sum.sample(), 0);</span> + <span class='doccomment'>/// sink.send(2);</span> + <span class='doccomment'>/// assert_eq!(sum.sample(), 2);</span> + <span class='doccomment'>/// sink.send(4);</span> + <span class='doccomment'>/// assert_eq!(sum.sample(), 6);</span> + <span class='doccomment'>/// ```</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>scan</span><span class='op'><</span><span class='ident'>B</span>, <span class='ident'>F</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>initial</span>: <span class='ident'>B</span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-></span> <span class='ident'>Signal</span><span class='op'><</span><span class='ident'>B</span><span class='op'>></span> + <span class='kw'>where</span> <span class='ident'>B</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>'static</span>, + <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='ident'>B</span>, <span class='ident'>A</span>) <span class='op'>-></span> <span class='ident'>B</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>'static</span>, + { + <span class='ident'>Signal</span>::<span class='ident'>cyclic</span>(<span class='op'>|</span><span class='ident'>scan</span><span class='op'>|</span> <span class='ident'>scan</span>.<span class='ident'>snapshot</span>(<span class='self'>self</span>, <span class='ident'>f</span>).<span class='ident'>hold</span>(<span class='ident'>initial</span>)) + } + + <span class='doccomment'>/// Scan a stream and accumulate its event firings in some mutable state.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// Semantically this is equivalent to `scan`. However, it allows one to use</span> + <span class='doccomment'>/// a non-Clone type as an accumulator and update it with efficient in-place</span> + <span class='doccomment'>/// operations.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// The resulting `SignalMut` does have a slightly different API from a</span> + <span class='doccomment'>/// regular `Signal` as it does not allow clones.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// # Example</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// ```</span> + <span class='doccomment'>/// # use carboxyl::{ Sink, Signal };</span> + <span class='doccomment'>/// let sink: Sink<i32> = Sink::new();</span> + <span class='doccomment'>/// let sum = sink.stream()</span> + <span class='doccomment'>/// .scan_mut(0, |sum, a| *sum += a)</span> + <span class='doccomment'>/// .combine(&Signal::new(()), |sum, ()| *sum);</span> + <span class='doccomment'>/// assert_eq!(sum.sample(), 0);</span> + <span class='doccomment'>/// sink.send(2);</span> + <span class='doccomment'>/// assert_eq!(sum.sample(), 2);</span> + <span class='doccomment'>/// sink.send(4);</span> + <span class='doccomment'>/// assert_eq!(sum.sample(), 6);</span> + <span class='doccomment'>/// ```</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>scan_mut</span><span class='op'><</span><span class='ident'>B</span>, <span class='ident'>F</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>initial</span>: <span class='ident'>B</span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-></span> <span class='ident'>SignalMut</span><span class='op'><</span><span class='ident'>B</span><span class='op'>></span> + <span class='kw'>where</span> <span class='ident'>B</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>'static</span>, + <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>B</span>, <span class='ident'>A</span>) <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>'static</span>, + { + <span class='ident'>signal</span>::<span class='ident'>scan_mut</span>(<span class='self'>self</span>, <span class='ident'>initial</span>, <span class='ident'>f</span>) + } +} + +<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>'static</span><span class='op'>></span> <span class='ident'>Stream</span><span class='op'><</span><span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>A</span><span class='op'>>></span> { + <span class='doccomment'>/// Filter a stream of options.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// `filter_some` creates a new stream that only fires the unwrapped</span> + <span class='doccomment'>/// `Some(…)` events from the original stream omitting any `None` events.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// ```</span> + <span class='doccomment'>/// # use carboxyl::Sink;</span> + <span class='doccomment'>/// let sink = Sink::new();</span> + <span class='doccomment'>/// let mut events = sink.stream().filter_some().events();</span> + <span class='doccomment'>/// sink.send(None); // won't arrive</span> + <span class='doccomment'>/// sink.send(Some(5)); // will arrive</span> + <span class='doccomment'>/// assert_eq!(events.next(), Some(5));</span> + <span class='doccomment'>/// ```</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>filter_some</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>Stream</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>commit</span>(<span class='op'>||</span> { + <span class='kw'>let</span> <span class='ident'>src</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>Source</span>::<span class='ident'>new</span>())); + <span class='kw'>let</span> <span class='ident'>weak</span> <span class='op'>=</span> <span class='ident'>src</span>.<span class='ident'>downgrade</span>(); + <span class='self'>self</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>() + .<span class='ident'>register</span>(<span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> <span class='ident'>a</span>.<span class='ident'>map_or</span>( + <span class='prelude-val'>Ok</span>(()), + <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> <span class='ident'>with_weak</span>(<span class='kw-2'>&</span><span class='ident'>weak</span>, <span class='op'>|</span><span class='ident'>src</span><span class='op'>|</span> <span class='ident'>src</span>.<span class='ident'>send</span>(<span class='ident'>a</span>)) + )); + <span class='ident'>Stream</span> { + <span class='ident'>source</span>: <span class='ident'>src</span>, + <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='self'>self</span>.<span class='ident'>clone</span>()) + } + }) + } +} + +<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>'static</span><span class='op'>></span> <span class='ident'>Stream</span><span class='op'><</span><span class='ident'>Stream</span><span class='op'><</span><span class='ident'>A</span><span class='op'>>></span> { + <span class='doccomment'>/// Switch between streams.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// This takes a stream of streams and maps it to a new stream, which fires</span> + <span class='doccomment'>/// all events from the most recent stream fired into it.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// # Example</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// ```</span> + <span class='doccomment'>/// # use carboxyl::{ Sink, Stream };</span> + <span class='doccomment'>/// // Create sinks</span> + <span class='doccomment'>/// let stream_sink: Sink<Stream<i32>> = Sink::new();</span> + <span class='doccomment'>/// let sink1: Sink<i32> = Sink::new();</span> + <span class='doccomment'>/// let sink2: Sink<i32> = Sink::new();</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// // Switch and listen</span> + <span class='doccomment'>/// let switched = stream_sink.stream().switch();</span> + <span class='doccomment'>/// let mut events = switched.events();</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// // Should not receive events from either sink</span> + <span class='doccomment'>/// sink1.send(1); sink2.send(2);</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// // Now switch to sink 2</span> + <span class='doccomment'>/// stream_sink.send(sink2.stream());</span> + <span class='doccomment'>/// sink1.send(3); sink2.send(4);</span> + <span class='doccomment'>/// assert_eq!(events.next(), Some(4));</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// // And then to sink 1</span> + <span class='doccomment'>/// stream_sink.send(sink1.stream());</span> + <span class='doccomment'>/// sink1.send(5); sink2.send(6);</span> + <span class='doccomment'>/// assert_eq!(events.next(), Some(5));</span> + <span class='doccomment'>/// ```</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>switch</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>Stream</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='kw'>fn</span> <span class='ident'>rewire_callbacks</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span>(<span class='ident'>new_stream</span>: <span class='ident'>Stream</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span>, <span class='ident'>source</span>: <span class='ident'>Weak</span><span class='op'><</span><span class='ident'>RwLock</span><span class='op'><</span><span class='ident'>Source</span><span class='op'><</span><span class='ident'>A</span><span class='op'>>></span><span class='op'>></span>, + <span class='ident'>terminate</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>Arc</span><span class='op'><</span>()<span class='op'>></span>) + <span class='op'>-></span> <span class='ident'>CallbackResult</span> + <span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>'static</span>, + { + <span class='op'>*</span><span class='ident'>terminate</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(()); + <span class='kw'>let</span> <span class='ident'>weak</span> <span class='op'>=</span> <span class='ident'>terminate</span>.<span class='ident'>downgrade</span>(); + <span class='ident'>new_stream</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>().<span class='ident'>register</span>(<span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> + <span class='ident'>weak</span>.<span class='ident'>upgrade</span>() + .<span class='ident'>ok_or</span>(<span class='ident'>CallbackError</span>::<span class='ident'>Disappeared</span>) + .<span class='ident'>and_then</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>with_weak</span>(<span class='kw-2'>&</span><span class='ident'>source</span>, <span class='op'>|</span><span class='ident'>src</span><span class='op'>|</span> <span class='ident'>src</span>.<span class='ident'>send</span>(<span class='ident'>a</span>))) + ); + <span class='prelude-val'>Ok</span>(()) + } + <span class='ident'>commit</span>(<span class='op'>||</span> { + <span class='kw'>let</span> <span class='ident'>src</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>Source</span>::<span class='ident'>new</span>())); + <span class='kw'>let</span> <span class='ident'>weak</span> <span class='op'>=</span> <span class='ident'>src</span>.<span class='ident'>downgrade</span>(); + <span class='self'>self</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>().<span class='ident'>register</span>({ + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>terminate</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(()); + <span class='kw'>move</span> <span class='op'>|</span><span class='ident'>stream</span><span class='op'>|</span> <span class='ident'>rewire_callbacks</span>(<span class='ident'>stream</span>, <span class='ident'>weak</span>.<span class='ident'>clone</span>(), <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>terminate</span>) + }); + <span class='ident'>Stream</span> { + <span class='ident'>source</span>: <span class='ident'>src</span>, + <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='self'>self</span>.<span class='ident'>clone</span>()), + } + }) + } +} + + +<span class='doccomment'>/// Make a snapshot of a signal, whenever a stream fires an event.</span> +<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>snapshot</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span>, <span class='ident'>C</span>, <span class='ident'>F</span><span class='op'>></span>(<span class='ident'>signal</span>: <span class='kw-2'>&</span><span class='ident'>Signal</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span>, <span class='ident'>stream</span>: <span class='kw-2'>&</span><span class='ident'>Stream</span><span class='op'><</span><span class='ident'>B</span><span class='op'>></span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-></span> <span class='ident'>Stream</span><span class='op'><</span><span class='ident'>C</span><span class='op'>></span> + <span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>'static</span>, + <span class='ident'>B</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>'static</span>, + <span class='ident'>C</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>'static</span>, + <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='ident'>A</span>, <span class='ident'>B</span>) <span class='op'>-></span> <span class='ident'>C</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>'static</span>, +{ + <span class='ident'>commit</span>(<span class='op'>||</span> { + <span class='kw'>let</span> <span class='ident'>src</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>Source</span>::<span class='ident'>new</span>())); + <span class='kw'>let</span> <span class='ident'>weak</span> <span class='op'>=</span> <span class='ident'>src</span>.<span class='ident'>downgrade</span>(); + <span class='ident'>stream</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>().<span class='ident'>register</span>({ + <span class='kw'>let</span> <span class='ident'>signal</span> <span class='op'>=</span> <span class='ident'>signal</span>.<span class='ident'>clone</span>(); + <span class='kw'>move</span> <span class='op'>|</span><span class='ident'>b</span><span class='op'>|</span> <span class='ident'>with_weak</span>(<span class='kw-2'>&</span><span class='ident'>weak</span>, <span class='op'>|</span><span class='ident'>src</span><span class='op'>|</span> <span class='ident'>src</span>.<span class='ident'>send</span>(<span class='ident'>f</span>(<span class='ident'>sample_raw</span>(<span class='kw-2'>&</span><span class='ident'>signal</span>), <span class='ident'>b</span>))) + }); + <span class='ident'>Stream</span> { + <span class='ident'>source</span>: <span class='ident'>src</span>, + <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>((<span class='ident'>stream</span>.<span class='ident'>clone</span>(), <span class='ident'>signal</span>.<span class='ident'>clone</span>())), + } + }) +} + + +<span class='doccomment'>/// A blocking iterator over events in a stream.</span> +<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Events</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>receiver</span>: <span class='ident'>Receiver</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span>, + <span class='attribute'>#[<span class='ident'>allow</span>(<span class='ident'>dead_code</span>)]</span> + <span class='ident'>keep_alive</span>: <span class='ident'>Box</span><span class='op'><</span><span class='ident'>BoxClone</span><span class='op'>></span>, +} + +<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>'static</span><span class='op'>></span> <span class='ident'>Events</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='doccomment'>/// Create a new events iterator.</span> + <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>stream</span>: <span class='kw-2'>&</span><span class='ident'>Stream</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span>) <span class='op'>-></span> <span class='ident'>Events</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>commit</span>(<span class='op'>||</span> { + <span class='kw'>let</span> (<span class='ident'>tx</span>, <span class='ident'>rx</span>) <span class='op'>=</span> <span class='ident'>channel</span>(); + <span class='kw'>let</span> <span class='ident'>tx</span> <span class='op'>=</span> <span class='ident'>Mutex</span>::<span class='ident'>new</span>(<span class='ident'>tx</span>); + <span class='ident'>stream</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>().<span class='ident'>register</span>( + <span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> <span class='ident'>tx</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>().<span class='ident'>send</span>(<span class='ident'>a</span>).<span class='ident'>map_err</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>CallbackError</span>::<span class='ident'>Disappeared</span>) + ); + <span class='ident'>Events</span> { + <span class='ident'>receiver</span>: <span class='ident'>rx</span>, + <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>stream</span>.<span class='ident'>clone</span>()), + } + }) + } +} + +<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>'static</span><span class='op'>></span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>Events</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='ident'>A</span>; + <span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { <span class='self'>self</span>.<span class='ident'>receiver</span>.<span class='ident'>recv</span>().<span class='ident'>ok</span>() } +} + + +<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span> +<span class='kw'>mod</span> <span class='ident'>test</span> { + <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>thread</span>; + <span class='kw'>use</span> <span class='ident'>quickcheck</span>::<span class='ident'>quickcheck</span>; + + <span class='kw'>use</span> <span class='ident'>testing</span>::{ <span class='ident'>id</span>, <span class='ident'>stream_eq</span> }; + <span class='kw'>use</span> <span class='ident'>super</span>::<span class='op'>*</span>; + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>sink</span>() { + <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>events</span>(); + <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>1</span>); + <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>2</span>); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>1</span>)); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>2</span>)); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>map</span>() { + <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>triple</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='number'>3</span> <span class='op'>*</span> <span class='ident'>x</span>); + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>triple</span>.<span class='ident'>events</span>(); + <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>1</span>); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>3</span>)); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>filter_some</span>() { + <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>small</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>filter_some</span>(); + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>small</span>.<span class='ident'>events</span>(); + <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='prelude-val'>None</span>); + <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='prelude-val'>Some</span>(<span class='number'>9</span>)); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>9</span>)); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>chain_1</span>() { + <span class='kw'>let</span> <span class='ident'>sink</span>: <span class='ident'>Sink</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>chain</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>() + .<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span> <span class='op'>/</span> <span class='number'>2</span>) + .<span class='ident'>filter</span>(<span class='op'>|</span><span class='kw-2'>&</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span> <span class='op'><</span> <span class='number'>3</span>); + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>chain</span>.<span class='ident'>events</span>(); + <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>7</span>); + <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>4</span>); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>2</span>)); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>merge</span>() { + <span class='kw'>let</span> <span class='ident'>sink1</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>sink2</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>sink1</span>.<span class='ident'>stream</span>().<span class='ident'>merge</span>(<span class='kw-2'>&</span><span class='ident'>sink2</span>.<span class='ident'>stream</span>()).<span class='ident'>events</span>(); + <span class='ident'>sink1</span>.<span class='ident'>send</span>(<span class='number'>12</span>); + <span class='ident'>sink2</span>.<span class='ident'>send</span>(<span class='number'>9</span>); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>12</span>)); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>9</span>)); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>chain_2</span>() { + <span class='kw'>let</span> <span class='ident'>sink1</span>: <span class='ident'>Sink</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>sink2</span>: <span class='ident'>Sink</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>sink1</span>.<span class='ident'>stream</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span> <span class='op'>+</span> <span class='number'>4</span>) + .<span class='ident'>merge</span>( + <span class='kw-2'>&</span><span class='ident'>sink2</span>.<span class='ident'>stream</span>() + .<span class='ident'>filter_map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='kw'>if</span> <span class='ident'>x</span> <span class='op'><</span> <span class='number'>4</span> { <span class='prelude-val'>Some</span>(<span class='ident'>x</span>) } <span class='kw'>else</span> { <span class='prelude-val'>None</span> }) + .<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span> <span class='op'>*</span> <span class='number'>5</span>)) + .<span class='ident'>events</span>(); + <span class='ident'>sink1</span>.<span class='ident'>send</span>(<span class='number'>12</span>); + <span class='ident'>sink2</span>.<span class='ident'>send</span>(<span class='number'>3</span>); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>16</span>)); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>15</span>)); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>move_closure</span>() { + <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>x</span> <span class='op'>=</span> <span class='number'>3</span>; + <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>map</span>(<span class='kw'>move</span> <span class='op'>|</span><span class='ident'>y</span><span class='op'>|</span> <span class='ident'>y</span> <span class='op'>+</span> <span class='ident'>x</span>); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>scan_race_condition</span>() { + <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='comment'>// Feed the sink in the background</span> + <span class='ident'>sink</span>.<span class='ident'>feed_async</span>(<span class='number'>0</span>..<span class='number'>100000</span>); + <span class='comment'>// Try it multiple times to increase failure probability, when a data</span> + <span class='comment'>// race can potentially happen.</span> + <span class='kw'>for</span> _ <span class='kw'>in</span> <span class='number'>0</span>..<span class='number'>10</span> { + <span class='kw'>let</span> <span class='ident'>_sum</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>scan</span>(<span class='number'>0</span>, <span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> <span class='ident'>a</span> <span class='op'>+</span> <span class='ident'>b</span>); + } + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>sink_send_async</span>() { + <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>events</span>(); + <span class='ident'>sink</span>.<span class='ident'>send_async</span>(<span class='number'>1</span>); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>1</span>)); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>sink_feed</span>() { + <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>events</span>(); + <span class='ident'>sink</span>.<span class='ident'>feed</span>(<span class='number'>0</span>..<span class='number'>10</span>); + <span class='kw'>for</span> (<span class='ident'>n</span>, <span class='ident'>m</span>) <span class='kw'>in</span> <span class='ident'>events</span>.<span class='ident'>take</span>(<span class='number'>10</span>).<span class='ident'>enumerate</span>() { + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>n</span> <span class='kw'>as</span> <span class='ident'>i32</span>, <span class='ident'>m</span>); + } + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>sink_feed_async</span>() { + <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>events</span>(); + <span class='ident'>sink</span>.<span class='ident'>feed_async</span>(<span class='number'>0</span>..<span class='number'>10</span>); + <span class='kw'>for</span> (<span class='ident'>n</span>, <span class='ident'>m</span>) <span class='kw'>in</span> <span class='ident'>events</span>.<span class='ident'>take</span>(<span class='number'>10</span>).<span class='ident'>enumerate</span>() { + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>n</span> <span class='kw'>as</span> <span class='ident'>i32</span>, <span class='ident'>m</span>); + } + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>coalesce</span>() { + <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>stream</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>() + .<span class='ident'>merge</span>(<span class='kw-2'>&</span><span class='ident'>sink</span>.<span class='ident'>stream</span>()) + .<span class='ident'>coalesce</span>(<span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> <span class='ident'>a</span> <span class='op'>+</span> <span class='ident'>b</span>); + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>stream</span>.<span class='ident'>events</span>(); + + <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>1</span>); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>2</span>)); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>monoid_left_identity</span>() { + <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>input</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>></span> { + <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>(); + <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>stream_eq</span>(<span class='kw-2'>&</span><span class='ident'>Stream</span>::<span class='ident'>never</span>().<span class='ident'>merge</span>(<span class='kw-2'>&</span><span class='ident'>a</span>), <span class='kw-2'>&</span><span class='ident'>a</span>); + <span class='ident'>sink</span>.<span class='ident'>feed</span>(<span class='ident'>input</span>.<span class='ident'>into_iter</span>()); + <span class='ident'>eq</span>.<span class='ident'>sample</span>() + } + <span class='ident'>quickcheck</span>(<span class='ident'>check</span> <span class='kw'>as</span> <span class='kw'>fn</span>(<span class='ident'>Vec</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>></span>); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>monoid_right_identity</span>() { + <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>input</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>></span> { + <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>(); + <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>stream_eq</span>(<span class='kw-2'>&</span><span class='ident'>a</span>.<span class='ident'>merge</span>(<span class='kw-2'>&</span><span class='ident'>Stream</span>::<span class='ident'>never</span>()), <span class='kw-2'>&</span><span class='ident'>a</span>); + <span class='ident'>sink</span>.<span class='ident'>feed</span>(<span class='ident'>input</span>.<span class='ident'>into_iter</span>()); + <span class='ident'>eq</span>.<span class='ident'>sample</span>() + } + <span class='ident'>quickcheck</span>(<span class='ident'>check</span> <span class='kw'>as</span> <span class='kw'>fn</span>(<span class='ident'>Vec</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>></span>); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>monoid_associative</span>() { + <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>input_a</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>, <span class='ident'>input_b</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>, <span class='ident'>input_c</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>></span> { + <span class='kw'>let</span> <span class='ident'>sink_a</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>sink_b</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>sink_c</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>sink_a</span>.<span class='ident'>stream</span>(); + <span class='kw'>let</span> <span class='ident'>b</span> <span class='op'>=</span> <span class='ident'>sink_b</span>.<span class='ident'>stream</span>(); + <span class='kw'>let</span> <span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>sink_c</span>.<span class='ident'>stream</span>(); + <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>stream_eq</span>(<span class='kw-2'>&</span><span class='ident'>a</span>.<span class='ident'>merge</span>(<span class='kw-2'>&</span><span class='ident'>b</span>.<span class='ident'>merge</span>(<span class='kw-2'>&</span><span class='ident'>c</span>)), <span class='kw-2'>&</span><span class='ident'>a</span>.<span class='ident'>merge</span>(<span class='kw-2'>&</span><span class='ident'>b</span>).<span class='ident'>merge</span>(<span class='kw-2'>&</span><span class='ident'>c</span>)); + <span class='comment'>/* feed in parallel */</span> { + <span class='kw'>let</span> <span class='ident'>_g1</span> <span class='op'>=</span> <span class='ident'>thread</span>::<span class='ident'>scoped</span>(<span class='op'>||</span> <span class='ident'>sink_a</span>.<span class='ident'>feed</span>(<span class='ident'>input_a</span>.<span class='ident'>into_iter</span>())); + <span class='kw'>let</span> <span class='ident'>_g2</span> <span class='op'>=</span> <span class='ident'>thread</span>::<span class='ident'>scoped</span>(<span class='op'>||</span> <span class='ident'>sink_b</span>.<span class='ident'>feed</span>(<span class='ident'>input_b</span>.<span class='ident'>into_iter</span>())); + <span class='kw'>let</span> <span class='ident'>_g3</span> <span class='op'>=</span> <span class='ident'>thread</span>::<span class='ident'>scoped</span>(<span class='op'>||</span> <span class='ident'>sink_c</span>.<span class='ident'>feed</span>(<span class='ident'>input_c</span>.<span class='ident'>into_iter</span>())); + } + <span class='ident'>eq</span>.<span class='ident'>sample</span>() + } + <span class='ident'>quickcheck</span>(<span class='ident'>check</span> <span class='kw'>as</span> <span class='kw'>fn</span>(<span class='ident'>Vec</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>, <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>, <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>></span>); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>functor_identity</span>() { + <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>input</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>></span> { + <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>(); + <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>stream_eq</span>(<span class='kw-2'>&</span><span class='ident'>a</span>.<span class='ident'>map</span>(<span class='ident'>id</span>), <span class='kw-2'>&</span><span class='ident'>a</span>); + <span class='ident'>sink</span>.<span class='ident'>feed</span>(<span class='ident'>input</span>.<span class='ident'>into_iter</span>()); + <span class='ident'>eq</span>.<span class='ident'>sample</span>() + } + <span class='ident'>quickcheck</span>(<span class='ident'>check</span> <span class='kw'>as</span> <span class='kw'>fn</span>(<span class='ident'>Vec</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>></span>); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>functor_composition</span>() { + <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>input</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>></span> { + <span class='kw'>fn</span> <span class='ident'>f</span>(<span class='ident'>n</span>: <span class='ident'>i32</span>) <span class='op'>-></span> <span class='ident'>i64</span> { (<span class='ident'>n</span> <span class='op'>+</span> <span class='number'>3</span>) <span class='kw'>as</span> <span class='ident'>i64</span> } + <span class='kw'>fn</span> <span class='ident'>g</span>(<span class='ident'>n</span>: <span class='ident'>i64</span>) <span class='op'>-></span> <span class='ident'>f64</span> { <span class='ident'>n</span> <span class='kw'>as</span> <span class='ident'>f64</span> <span class='op'>/</span> <span class='number'>2.5</span> } + + <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>(); + <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>stream_eq</span>(<span class='kw-2'>&</span><span class='ident'>a</span>.<span class='ident'>map</span>(<span class='ident'>f</span>).<span class='ident'>map</span>(<span class='ident'>g</span>), <span class='kw-2'>&</span><span class='ident'>a</span>.<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>n</span><span class='op'>|</span> <span class='ident'>g</span>(<span class='ident'>f</span>(<span class='ident'>n</span>)))); + <span class='ident'>sink</span>.<span class='ident'>feed</span>(<span class='ident'>input</span>.<span class='ident'>into_iter</span>()); + <span class='ident'>eq</span>.<span class='ident'>sample</span>() + } + <span class='ident'>quickcheck</span>(<span class='ident'>check</span> <span class='kw'>as</span> <span class='kw'>fn</span>(<span class='ident'>Vec</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>></span>); + } +} +</pre> +</section> + <section id='search' class="content hidden"></section> + + <section class="footer"></section> + + <div id="help" class="hidden"> + <div class="shortcuts"> + <h1>Keyboard shortcuts</h1> + <dl> + <dt>?</dt> + <dd>Show this help dialog</dd> + <dt>S</dt> + <dd>Focus the search field</dd> + <dt>⇤</dt> + <dd>Move up in search results</dd> + <dt>⇥</dt> + <dd>Move down in search results</dd> + <dt>⏎</dt> + <dd>Go to active search result</dd> + </dl> + </div> + <div class="infos"> + <h1>Search tricks</h1> + <p> + Prefix searches with a type followed by a colon (e.g. + <code>fn:</code>) to restrict the search to a given type. + </p> + <p> + Accepted types are: <code>fn</code>, <code>mod</code>, + <code>struct</code>, <code>enum</code>, + <code>trait</code>, <code>typedef</code> (or + <code>tdef</code>). + </p> + <p> + Search functions by type signature (e.g. + <code>vec -> usize</code>) + </p> + </div> + </div> + + + + <script> + window.rootPath = "../../"; + window.currentCrate = "carboxyl"; 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