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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/signal.rs.html | |
| download | irsc-gh-pages.tar.gz irsc-gh-pages.tar.xz irsc-gh-pages.zip | |
Update documentationgh-pages
Diffstat (limited to 'src/carboxyl/signal.rs.html')
| -rw-r--r-- | src/carboxyl/signal.rs.html | 1601 |
1 files changed, 1601 insertions, 0 deletions
diff --git a/src/carboxyl/signal.rs.html b/src/carboxyl/signal.rs.html new file mode 100644 index 0000000..659a0a7 --- /dev/null +++ b/src/carboxyl/signal.rs.html @@ -0,0 +1,1601 @@ +<!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/signal.rs`."> + <meta name="keywords" content="rust, rustlang, rust-lang"> + + <title>signal.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="586">586</span> +<span id="587">587</span> +<span id="588">588</span> +<span id="589">589</span> +<span id="590">590</span> +<span id="591">591</span> +<span id="592">592</span> +<span id="593">593</span> +<span id="594">594</span> +<span id="595">595</span> +<span id="596">596</span> +<span id="597">597</span> +<span id="598">598</span> +<span id="599">599</span> +<span id="600">600</span> +<span id="601">601</span> +<span id="602">602</span> +<span id="603">603</span> +<span id="604">604</span> +<span id="605">605</span> +<span id="606">606</span> +<span id="607">607</span> +<span id="608">608</span> +<span id="609">609</span> +<span id="610">610</span> +<span id="611">611</span> +<span id="612">612</span> +<span id="613">613</span> +<span id="614">614</span> +<span id="615">615</span> +<span id="616">616</span> +<span id="617">617</span> +<span id="618">618</span> +<span id="619">619</span> +<span id="620">620</span> +<span id="621">621</span> +<span id="622">622</span> +<span id="623">623</span> +<span id="624">624</span> +<span id="625">625</span> +<span id="626">626</span> +<span id="627">627</span> +<span id="628">628</span> +<span id="629">629</span> +<span id="630">630</span> +<span id="631">631</span> +<span id="632">632</span> +<span id="633">633</span> +<span id="634">634</span> +<span id="635">635</span> +<span id="636">636</span> +<span id="637">637</span> +<span id="638">638</span> +<span id="639">639</span> +<span id="640">640</span> +<span id="641">641</span> +<span id="642">642</span> +<span id="643">643</span> +<span id="644">644</span> +<span id="645">645</span> +<span id="646">646</span> +<span id="647">647</span> +<span id="648">648</span> +<span id="649">649</span> +<span id="650">650</span> +<span id="651">651</span> +<span id="652">652</span> +<span id="653">653</span> +<span id="654">654</span> +<span id="655">655</span> +<span id="656">656</span> +<span id="657">657</span> +<span id="658">658</span> +<span id="659">659</span> +<span 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> +</pre><pre class='rust '> +<span class='doccomment'>//! Continuous time signals</span> + +<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::{ <span class='ident'>Arc</span>, <span class='ident'>Mutex</span>, <span class='ident'>RwLock</span> }; +<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>ops</span>::<span class='ident'>Deref</span>; +<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fmt</span>; +<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span> +<span class='kw'>use</span> <span class='ident'>quickcheck</span>::{ <span class='ident'>Arbitrary</span>, <span class='ident'>Gen</span> }; + +<span class='kw'>use</span> <span class='ident'>source</span>::{ <span class='ident'>Source</span>, <span class='ident'>with_weak</span>, <span class='ident'>CallbackError</span> }; +<span class='kw'>use</span> <span class='ident'>stream</span>::{ <span class='self'>self</span>, <span class='ident'>BoxClone</span>, <span class='ident'>Stream</span> }; +<span class='kw'>use</span> <span class='ident'>transaction</span>::{ <span class='ident'>commit</span>, <span class='ident'>end</span> }; +<span class='kw'>use</span> <span class='ident'>pending</span>::<span class='ident'>Pending</span>; +<span class='kw'>use</span> <span class='ident'>readonly</span>::{ <span class='self'>self</span>, <span class='ident'>ReadOnly</span> }; +<span class='kw'>use</span> <span class='ident'>lift</span>; +<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span> +<span class='kw'>use</span> <span class='ident'>testing</span>::<span class='ident'>ArcFn</span>; + + +<span class='doccomment'>/// A functional signal. Caches its return value during a transaction.</span> +<span class='kw'>struct</span> <span class='ident'>FuncSignal</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>func</span>: <span class='ident'>Box</span><span class='op'><</span><span class='ident'>Fn</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='op'>></span>, + <span class='ident'>cache</span>: <span class='ident'>Arc</span><span class='op'><</span><span class='ident'>Mutex</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='op'>></span>, +} + +<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> <span class='ident'>FuncSignal</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span><span class='op'><</span><span class='ident'>F</span>: <span class='ident'>Fn</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='op'>></span>(<span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-></span> <span class='ident'>FuncSignal</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>FuncSignal</span> { + <span class='ident'>func</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>f</span>), + <span class='ident'>cache</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'>impl</span><span class='op'><</span><span class='ident'>A</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>'static</span><span class='op'>></span> <span class='ident'>FuncSignal</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='doccomment'>/// Call the function or fetch the cached value if present.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>call</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>A</span> { + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>cached</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>cache</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>(); + <span class='kw'>match</span> <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='op'>*</span><span class='ident'>cached</span> { + <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='prelude-val'>Some</span>(<span class='kw-2'>ref</span> <span class='ident'>value</span>) <span class='op'>=></span> <span class='ident'>value</span>.<span class='ident'>clone</span>(), + <span class='ident'>cached</span> <span class='op'>=></span> { + <span class='comment'>// Register callback to reset cache at the end of the transaction</span> + <span class='kw'>let</span> <span class='ident'>cache</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>cache</span>.<span class='ident'>clone</span>(); + <span class='ident'>end</span>(<span class='kw'>move</span> <span class='op'>||</span> { + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>live</span> <span class='op'>=</span> <span class='ident'>cache</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>(); + <span class='op'>*</span><span class='ident'>live</span> <span class='op'>=</span> <span class='prelude-val'>None</span>; + }); + <span class='comment'>// Calculate & cache value</span> + <span class='kw'>let</span> <span class='ident'>value</span> <span class='op'>=</span> (<span class='self'>self</span>.<span class='ident'>func</span>)(); + <span class='op'>*</span><span class='ident'>cached</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='ident'>value</span>.<span class='ident'>clone</span>()); + <span class='ident'>value</span> + }, + } + } +} + + +<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>SignalFn</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>Const</span>(<span class='ident'>A</span>), + <span class='ident'>Func</span>(<span class='ident'>FuncSignal</span><span class='op'><</span><span class='ident'>A</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'>SignalFn</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>from_fn</span><span class='op'><</span><span class='ident'>F</span>: <span class='ident'>Fn</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='op'>></span>(<span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-></span> <span class='ident'>SignalFn</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>SignalFn</span>::<span class='ident'>Func</span>(<span class='ident'>FuncSignal</span>::<span class='ident'>new</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='lifetime'>'static</span><span class='op'>></span> <span class='ident'>SignalFn</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>call</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>A</span> { + <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> { + <span class='ident'>SignalFn</span>::<span class='ident'>Const</span>(<span class='kw-2'>ref</span> <span class='ident'>a</span>) <span class='op'>=></span> <span class='ident'>a</span>.<span class='ident'>clone</span>(), + <span class='ident'>SignalFn</span>::<span class='ident'>Func</span>(<span class='kw-2'>ref</span> <span class='ident'>f</span>) <span class='op'>=></span> <span class='ident'>f</span>.<span class='ident'>call</span>(), + } + } +} + + +<span class='doccomment'>/// Helper function to register callback handlers related to signal construction.</span> +<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>reg_signal</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span>, <span class='ident'>F</span><span class='op'>></span>(<span class='ident'>parent_source</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>Source</span><span class='op'><</span><span class='ident'>A</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'>B</span><span class='op'>></span>, <span class='ident'>handler</span>: <span class='ident'>F</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='lifetime'>'static</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='ident'>A</span>) <span class='op'>-></span> <span class='ident'>SignalFn</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='kw'>let</span> <span class='ident'>weak_source</span> <span class='op'>=</span> <span class='ident'>signal</span>.<span class='ident'>source</span>.<span class='ident'>downgrade</span>(); + <span class='kw'>let</span> <span class='ident'>weak_current</span> <span class='op'>=</span> <span class='ident'>signal</span>.<span class='ident'>current</span>.<span class='ident'>downgrade</span>(); + <span class='ident'>parent_source</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_current</span>.<span class='ident'>upgrade</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>cur</span><span class='op'>|</span> <span class='ident'>end</span>( + <span class='kw'>move</span> <span class='op'>||</span> { <span class='kw'>let</span> _ <span class='op'>=</span> <span class='ident'>cur</span>.<span class='ident'>write</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='kw-2'>mut</span> <span class='ident'>cur</span><span class='op'>|</span> <span class='ident'>cur</span>.<span class='ident'>update</span>()); })) + .<span class='ident'>ok_or</span>(<span class='ident'>CallbackError</span>::<span class='ident'>Disappeared</span>) + .<span class='ident'>and</span>(<span class='ident'>with_weak</span>(<span class='kw-2'>&</span><span class='ident'>weak_current</span>, <span class='op'>|</span><span class='ident'>cur</span><span class='op'>|</span> <span class='ident'>cur</span>.<span class='ident'>queue</span>(<span class='ident'>handler</span>(<span class='ident'>a</span>)))) + .<span class='ident'>and</span>(<span class='ident'>with_weak</span>(<span class='kw-2'>&</span><span class='ident'>weak_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='doccomment'>/// External helper function to build a signal.</span> +<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>signal_build</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>K</span><span class='op'>></span>(<span class='ident'>func</span>: <span class='ident'>SignalFn</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span>, <span class='ident'>keep_alive</span>: <span class='ident'>K</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='kw'>where</span> <span class='ident'>K</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'>Signal</span>::<span class='ident'>build</span>(<span class='ident'>func</span>, <span class='ident'>keep_alive</span>) +} + +<span class='doccomment'>/// External accessor to current state of a signal.</span> +<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>signal_current</span><span class='op'><</span><span class='ident'>A</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='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'>Pending</span><span class='op'><</span><span class='ident'>SignalFn</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'>signal</span>.<span class='ident'>current</span> +} + +<span class='doccomment'>/// External accessor to signal source.</span> +<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>signal_source</span><span class='op'><</span><span class='ident'>A</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='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='op'>>></span><span class='op'>></span> { + <span class='kw-2'>&</span><span class='ident'>signal</span>.<span class='ident'>source</span> +} + +<span class='doccomment'>/// Sample the value of the signal without committing it as a transaction.</span> +<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>sample_raw</span><span class='op'><</span><span class='ident'>A</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>'static</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='op'>-></span> <span class='ident'>A</span> { + <span class='ident'>signal</span>.<span class='ident'>current</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>().<span class='ident'>call</span>() +} + + +<span class='doccomment'>/// A continuous signal that changes over time.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// Signals can be thought of as values that change over time. They have both a</span> +<span class='doccomment'>/// continuous and a discrete component. This means that their current value is</span> +<span class='doccomment'>/// defined by a function that can be called at any time. That function is only</span> +<span class='doccomment'>/// evaluated on-demand, when the signal's current value is sampled. (This is</span> +<span class='doccomment'>/// also called pull semantics in the literature on FRP.)</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// In addition, the current function used to sample a signal may change</span> +<span class='doccomment'>/// discretely in reaction to some event. For instance, it is possible to create</span> +<span class='doccomment'>/// a signal from an event stream, by holding the last event occurence as the</span> +<span class='doccomment'>/// current value of the stream.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// # Algebraic laws</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// Signals come with some primitive methods to compose them with each other and</span> +<span class='doccomment'>/// with streams. Some of these primitives give the signals an algebraic</span> +<span class='doccomment'>/// structure.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// ## Functor</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// Signals form a functor under unary lifting. Thus, the following laws hold:</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// - Preservation of identity: `lift!(|x| x, &a) == a`,</span> +<span class='doccomment'>/// - Function composition: `lift!(|x| g(f(x)), &a) == lift!(g, &lift!(f, &a))`.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// ## Applicative functor</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// By extension, using the notion of a signal of a function, signals also</span> +<span class='doccomment'>/// become an [applicative][ghc-applicative] using `Signal::new` as `pure` and</span> +<span class='doccomment'>/// `|sf, sa| lift!(|f, a| f(a), &sf, &sa)` as `<*>`.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// *TODO: Expand on this and replace the Haskell reference.*</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// [ghc-applicative]: https://downloads.haskell.org/~ghc/latest/docs/html/libraries/base/Control-Applicative.html</span> +<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Signal</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>current</span>: <span class='ident'>Arc</span><span class='op'><</span><span class='ident'>RwLock</span><span class='op'><</span><span class='ident'>Pending</span><span class='op'><</span><span class='ident'>SignalFn</span><span class='op'><</span><span class='ident'>A</span><span class='op'>>></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='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'>Signal</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'>Signal</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>Signal</span> { + <span class='ident'>current</span>: <span class='self'>self</span>.<span class='ident'>current</span>.<span class='ident'>clone</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='op'>></span> <span class='ident'>Signal</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='kw'>fn</span> <span class='ident'>build</span><span class='op'><</span><span class='ident'>K</span><span class='op'>></span>(<span class='ident'>func</span>: <span class='ident'>SignalFn</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span>, <span class='ident'>keep_alive</span>: <span class='ident'>K</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='kw'>where</span> <span class='ident'>K</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'>Signal</span> { + <span class='ident'>current</span>: <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>Pending</span>::<span class='ident'>new</span>(<span class='ident'>func</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='ident'>keep_alive</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='lifetime'>'static</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='doccomment'>/// Create a constant signal.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>a</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'>build</span>(<span class='ident'>SignalFn</span>::<span class='ident'>Const</span>(<span class='ident'>a</span>), ()) + } + + <span class='doccomment'>/// Sample the current value of the signal.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>sample</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>A</span> { + <span class='ident'>commit</span>(<span class='op'>||</span> <span class='ident'>sample_raw</span>(<span class='self'>self</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'>Signal</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='doccomment'>/// Create a signal with a cyclic definition.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// The closure gets an undefined forward-declaration of a signal. It is</span> + <span class='doccomment'>/// supposed to return a self-referential definition of the same signal.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// Sampling the forward-declared signal, before it is properly defined,</span> + <span class='doccomment'>/// will cause a run-time panic.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// This pattern is useful to implement accumulators, counters and other</span> + <span class='doccomment'>/// loops that depend on the sampling behaviour of a signal before a</span> + <span class='doccomment'>/// transaction.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>cyclic</span><span class='op'><</span><span class='ident'>F</span><span class='op'>></span>(<span class='ident'>def</span>: <span class='ident'>F</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='kw'>where</span> <span class='ident'>F</span>: <span class='ident'>FnOnce</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='op'>-></span> <span class='ident'>Signal</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'>cycle</span> <span class='op'>=</span> <span class='ident'>SignalCycle</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>finished</span> <span class='op'>=</span> <span class='ident'>def</span>(<span class='kw-2'>&</span><span class='ident'>cycle</span>); + <span class='ident'>cycle</span>.<span class='ident'>define</span>(<span class='ident'>finished</span>) + }) + } + + <span class='doccomment'>/// Combine the signal with a stream in a snapshot.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// `snapshot` creates a new stream given a signal and a stream. Whenever</span> + <span class='doccomment'>/// the input stream fires an event, the output stream fires an event</span> + <span class='doccomment'>/// created from the signal's current value and that event using the</span> + <span class='doccomment'>/// supplied function.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// ```</span> + <span class='doccomment'>/// # use carboxyl::Sink;</span> + <span class='doccomment'>/// let sink1: Sink<i32> = Sink::new();</span> + <span class='doccomment'>/// let sink2: Sink<f64> = Sink::new();</span> + <span class='doccomment'>/// let mut events = sink1.stream().hold(1)</span> + <span class='doccomment'>/// .snapshot(&sink2.stream(), |a, b| (a, b))</span> + <span class='doccomment'>/// .events();</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// // Updating its signal does not cause the snapshot to fire</span> + <span class='doccomment'>/// sink1.send(4);</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// // However sending an event down the stream does</span> + <span class='doccomment'>/// sink2.send(3.0);</span> + <span class='doccomment'>/// assert_eq!(events.next(), Some((4, 3.0)));</span> + <span class='doccomment'>/// ```</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>snapshot</span><span class='op'><</span><span class='ident'>B</span>, <span class='ident'>C</span>, <span class='ident'>F</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='self'>self</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'>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'>stream</span>::<span class='ident'>snapshot</span>(<span class='self'>self</span>, <span class='ident'>stream</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'>Signal</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='doccomment'>/// Switch between signals.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// This transforms a `Signal<Signal<A>>` into a `Signal<A>`. The nested</span> + <span class='doccomment'>/// signal can be thought of as a representation of a switch between different</span> + <span class='doccomment'>/// input signals, that allows one to change the structure of the dependency</span> + <span class='doccomment'>/// graph at run-time. `switch` provides a way to access the inner value of</span> + <span class='doccomment'>/// the currently active signal.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// The following example demonstrates how to use this to switch between two</span> + <span class='doccomment'>/// input signals based on a `Button` event stream:</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// ```</span> + <span class='doccomment'>/// # use carboxyl::Sink;</span> + <span class='doccomment'>/// // Button type</span> + <span class='doccomment'>/// #[derive(Clone, Show)]</span> + <span class='doccomment'>/// enum Button { A, B };</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// // The input sinks</span> + <span class='doccomment'>/// let sink_a = Sink::<i32>::new();</span> + <span class='doccomment'>/// let sink_b = Sink::<i32>::new();</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// // The button sink</span> + <span class='doccomment'>/// let sink_button = Sink::<Button>::new();</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// // Create the output</span> + <span class='doccomment'>/// let output = {</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// // Hold input sinks in a signal with some initials</span> + <span class='doccomment'>/// let channel_a = sink_a.stream().hold(1);</span> + <span class='doccomment'>/// let channel_b = sink_b.stream().hold(2);</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// // A trivial default channel used before any button event</span> + <span class='doccomment'>/// let default_channel = Sink::new().stream().hold(0);</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// // Map button to the channel signals, hold with the default channel as</span> + <span class='doccomment'>/// // initial value and switch between the signals</span> + <span class='doccomment'>/// sink_button</span> + <span class='doccomment'>/// .stream()</span> + <span class='doccomment'>/// .map(move |b| match b {</span> + <span class='doccomment'>/// Button::A => channel_a.clone(),</span> + <span class='doccomment'>/// Button::B => channel_b.clone(),</span> + <span class='doccomment'>/// })</span> + <span class='doccomment'>/// .hold(default_channel)</span> + <span class='doccomment'>/// .switch()</span> + <span class='doccomment'>/// };</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// // In the beginning, output will come from the default channel</span> + <span class='doccomment'>/// assert_eq!(output.sample(), 0);</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// // Let's switch to channel A</span> + <span class='doccomment'>/// sink_button.send(Button::A);</span> + <span class='doccomment'>/// assert_eq!(output.sample(), 1);</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// // And to channel B</span> + <span class='doccomment'>/// sink_button.send(Button::B);</span> + <span class='doccomment'>/// assert_eq!(output.sample(), 2);</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// // The channels can change, too, of course</span> + <span class='doccomment'>/// for k in 4..13 {</span> + <span class='doccomment'>/// sink_b.send(k);</span> + <span class='doccomment'>/// assert_eq!(output.sample(), k);</span> + <span class='doccomment'>/// }</span> + <span class='doccomment'>/// sink_button.send(Button::A);</span> + <span class='doccomment'>/// for k in 21..77 {</span> + <span class='doccomment'>/// sink_a.send(k);</span> + <span class='doccomment'>/// assert_eq!(output.sample(), k);</span> + <span class='doccomment'>/// }</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'>Signal</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='kw'>fn</span> <span class='ident'>make_callback</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span>(<span class='ident'>parent</span>: <span class='kw-2'>&</span><span class='ident'>Signal</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='op'>-></span> <span class='ident'>SignalFn</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> + <span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>'static</span>, + { + <span class='comment'>// TODO: use information on inner value</span> + <span class='kw'>let</span> <span class='ident'>current_signal</span> <span class='op'>=</span> <span class='ident'>parent</span>.<span class='ident'>current</span>.<span class='ident'>clone</span>(); + <span class='ident'>SignalFn</span>::<span class='ident'>from_fn</span>(<span class='kw'>move</span> <span class='op'>||</span> + <span class='ident'>sample_raw</span>(<span class='kw-2'>&</span><span class='ident'>current_signal</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>().<span class='ident'>call</span>()) + ) + } + <span class='ident'>commit</span>(<span class='op'>||</span> { + <span class='kw'>let</span> <span class='ident'>signal</span> <span class='op'>=</span> <span class='ident'>Signal</span>::<span class='ident'>build</span>(<span class='ident'>make_callback</span>(<span class='self'>self</span>), ()); + <span class='kw'>let</span> <span class='ident'>parent</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>clone</span>(); + <span class='ident'>reg_signal</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>(), <span class='kw-2'>&</span><span class='ident'>signal</span>, + <span class='kw'>move</span> <span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>make_callback</span>(<span class='kw-2'>&</span><span class='ident'>parent</span>)); + <span class='ident'>signal</span> + }) + } +} + +<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span> +<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>></span> <span class='ident'>Signal</span><span class='op'><</span><span class='ident'>ArcFn</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</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='doccomment'>/// Applicative functionality. Applies a signal of function to a signal of</span> + <span class='doccomment'>/// its argument.</span> + <span class='kw'>fn</span> <span class='ident'>apply</span>(<span class='kw-2'>&</span><span class='self'>self</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='op'>-></span> <span class='ident'>Signal</span><span class='op'><</span><span class='ident'>B</span><span class='op'>></span> { + <span class='ident'>lift</span>::<span class='ident'>lift2</span>(<span class='op'>|</span><span class='ident'>f</span>, <span class='ident'>a</span><span class='op'>|</span> <span class='ident'>f</span>(<span class='ident'>a</span>), <span class='self'>self</span>, <span class='ident'>signal</span>) + } +} + +<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span> +<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span>: <span class='ident'>Arbitrary</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'>Arbitrary</span> <span class='kw'>for</span> <span class='ident'>Signal</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='kw'>fn</span> <span class='ident'>arbitrary</span><span class='op'><</span><span class='ident'>G</span>: <span class='ident'>Gen</span><span class='op'>></span>(<span class='ident'>g</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>G</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='kw'>let</span> <span class='ident'>values</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='op'><</span><span class='ident'>A</span><span class='op'>></span>::<span class='ident'>arbitrary</span>(<span class='ident'>g</span>); + <span class='kw'>if</span> <span class='ident'>values</span>.<span class='ident'>is_empty</span>() { + <span class='ident'>Signal</span>::<span class='ident'>new</span>(<span class='ident'>Arbitrary</span>::<span class='ident'>arbitrary</span>(<span class='ident'>g</span>)) + } <span class='kw'>else</span> { + <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='ident'>Mutex</span>::<span class='ident'>new</span>(<span class='number'>0</span>); + <span class='ident'>lift</span>::<span class='ident'>lift0</span>(<span class='kw'>move</span> <span class='op'>||</span> { + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='ident'>n</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>(); + <span class='op'>*</span><span class='ident'>n</span> <span class='op'>+=</span> <span class='number'>1</span>; + <span class='kw'>if</span> <span class='op'>*</span><span class='ident'>n</span> <span class='op'>>=</span> <span class='ident'>values</span>.<span class='ident'>len</span>() { <span class='op'>*</span><span class='ident'>n</span> <span class='op'>=</span> <span class='number'>0</span> } + <span class='ident'>values</span>[<span class='op'>*</span><span class='ident'>n</span>].<span class='ident'>clone</span>() + }) + } + } +} + +<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span>: <span class='ident'>fmt</span>::<span class='ident'>Debug</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'>fmt</span>::<span class='ident'>Debug</span> <span class='kw'>for</span> <span class='ident'>Signal</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>fmt</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span>(), <span class='ident'>fmt</span>::<span class='ident'>Error</span><span class='op'>></span> { + <span class='ident'>commit</span>(<span class='op'>||</span> <span class='kw'>match</span> <span class='op'>*</span><span class='op'>*</span><span class='self'>self</span>.<span class='ident'>current</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>() { + <span class='ident'>SignalFn</span>::<span class='ident'>Const</span>(<span class='kw-2'>ref</span> <span class='ident'>a</span>) <span class='op'>=></span> + <span class='ident'>fmt</span>.<span class='ident'>debug_struct</span>(<span class='string'>"Signal::const"</span>).<span class='ident'>field</span>(<span class='string'>"value"</span>, <span class='kw-2'>&</span><span class='ident'>a</span>).<span class='ident'>finish</span>(), + <span class='ident'>SignalFn</span>::<span class='ident'>Func</span>(<span class='kw-2'>ref</span> <span class='ident'>f</span>) <span class='op'>=></span> + <span class='ident'>fmt</span>.<span class='ident'>debug_struct</span>(<span class='string'>"Signal::fn"</span>).<span class='ident'>field</span>(<span class='string'>"current"</span>, <span class='kw-2'>&</span><span class='ident'>f</span>.<span class='ident'>call</span>()).<span class='ident'>finish</span>(), + }) + } +} + + +<span class='doccomment'>/// Forward declaration of a signal to create value loops.</span> +<span class='kw'>struct</span> <span class='ident'>SignalCycle</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>signal</span>: <span class='ident'>Signal</span><span class='op'><</span><span class='ident'>A</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='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>'static</span><span class='op'>></span> <span class='ident'>SignalCycle</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='doccomment'>/// Forward-declare a new signal.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-></span> <span class='ident'>SignalCycle</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='kw'>const</span> <span class='ident'>ERR</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span> <span class='op'>=</span> <span class='string'>"sampled on forward-declaration of signal"</span>; + <span class='ident'>SignalCycle</span> { <span class='ident'>signal</span>: <span class='ident'>Signal</span>::<span class='ident'>build</span>(<span class='ident'>SignalFn</span>::<span class='ident'>from_fn</span>(<span class='op'>||</span> <span class='macro'>panic</span><span class='macro'>!</span>(<span class='ident'>ERR</span>)), ()) } + } + + <span class='doccomment'>/// Provide the signal with a definition.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>define</span>(<span class='self'>self</span>, <span class='ident'>definition</span>: <span class='ident'>Signal</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></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='doccomment'>/// Generate a callback from the signal definition's current value.</span> + <span class='kw'>fn</span> <span class='ident'>make_callback</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span>(<span class='ident'>current_def</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'>Pending</span><span class='op'><</span><span class='ident'>SignalFn</span><span class='op'><</span><span class='ident'>A</span><span class='op'>>></span><span class='op'>>></span>) <span class='op'>-></span> <span class='ident'>SignalFn</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></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='kw'>match</span> <span class='op'>*</span><span class='ident'>current_def</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>().<span class='ident'>future</span>() { + <span class='ident'>SignalFn</span>::<span class='ident'>Const</span>(<span class='kw-2'>ref</span> <span class='ident'>a</span>) <span class='op'>=></span> <span class='ident'>SignalFn</span>::<span class='ident'>Const</span>(<span class='ident'>a</span>.<span class='ident'>clone</span>()), + <span class='ident'>SignalFn</span>::<span class='ident'>Func</span>(_) <span class='op'>=></span> <span class='ident'>SignalFn</span>::<span class='ident'>from_fn</span>({ + <span class='kw'>let</span> <span class='ident'>sig</span> <span class='op'>=</span> <span class='ident'>current_def</span>.<span class='ident'>downgrade</span>(); + <span class='kw'>move</span> <span class='op'>||</span> { + <span class='kw'>let</span> <span class='ident'>strong</span> <span class='op'>=</span> <span class='ident'>sig</span>.<span class='ident'>upgrade</span>().<span class='ident'>unwrap</span>(); + <span class='kw'>let</span> <span class='ident'>ret</span> <span class='op'>=</span> <span class='ident'>strong</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>().<span class='ident'>call</span>(); + <span class='ident'>ret</span> + } + }), + } + } + <span class='ident'>commit</span>(<span class='kw'>move</span> <span class='op'>||</span> { + <span class='op'>*</span><span class='self'>self</span>.<span class='ident'>signal</span>.<span class='ident'>current</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>() <span class='op'>=</span> <span class='ident'>Pending</span>::<span class='ident'>new</span>(<span class='ident'>make_callback</span>(<span class='kw-2'>&</span><span class='ident'>definition</span>.<span class='ident'>current</span>)); + <span class='kw'>let</span> <span class='ident'>weak_parent</span> <span class='op'>=</span> <span class='ident'>definition</span>.<span class='ident'>current</span>.<span class='ident'>downgrade</span>(); + <span class='ident'>reg_signal</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>definition</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>(), <span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>signal</span>, + <span class='kw'>move</span> <span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>make_callback</span>(<span class='kw-2'>&</span><span class='ident'>weak_parent</span>.<span class='ident'>upgrade</span>().<span class='ident'>unwrap</span>())); + <span class='ident'>Signal</span> { <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>definition</span>), ..<span class='self'>self</span>.<span class='ident'>signal</span> } + }) + } +} + +<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> <span class='ident'>Deref</span> <span class='kw'>for</span> <span class='ident'>SignalCycle</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='kw'>type</span> <span class='ident'>Target</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='kw'>fn</span> <span class='ident'>deref</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></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='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>signal</span> } +} + + +<span class='doccomment'>/// Signal variant using inner mutability for efficient in-place updates.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// This is the only kind of primitive that allows non-`Clone` types to be</span> +<span class='doccomment'>/// wrapped into functional reactive abstractions. The API is somewhat different</span> +<span class='doccomment'>/// from that of a regular signal to accommodate this.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// One cannot directly sample a `SignalMut` as this would require a clone.</span> +<span class='doccomment'>/// Instead it comes with a couple of adaptor methods that mimick a subset of</span> +<span class='doccomment'>/// the `Signal` API. However, all functions passed to these methods take the</span> +<span class='doccomment'>/// argument coming from the `SignalMut` by reference.</span> +<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>SignalMut</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='ident'>inner</span>: <span class='ident'>Signal</span><span class='op'><</span><span class='ident'>ReadOnly</span><span class='op'><</span><span class='ident'>A</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'>SignalMut</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span> { + <span class='doccomment'>/// Semantically the same as `Signal::snapshot`</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// The key difference here is, that the combining function takes its first</span> + <span class='doccomment'>/// argument by reference, as it can't be moved out of the `SignalMut`.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// # Example</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// ```</span> + <span class='doccomment'>/// # use carboxyl::Sink;</span> + <span class='doccomment'>/// let sink1 = Sink::new();</span> + <span class='doccomment'>/// let sink2 = Sink::new();</span> + <span class='doccomment'>/// // Collect values in a mutable `Vec`</span> + <span class='doccomment'>/// let values = sink1.stream().scan_mut(vec![], |v, a| v.push(a));</span> + <span class='doccomment'>/// // Snapshot some value from it</span> + <span class='doccomment'>/// let mut index = values.snapshot(&sink2.stream(),</span> + <span class='doccomment'>/// |v, k| v.get(k).map(|x| *x)</span> + <span class='doccomment'>/// ).events();</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// sink1.send(4);</span> + <span class='doccomment'>/// sink1.send(5);</span> + <span class='doccomment'>/// sink2.send(0);</span> + <span class='doccomment'>/// assert_eq!(index.next(), Some(Some(4)));</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// sink2.send(1);</span> + <span class='doccomment'>/// assert_eq!(index.next(), Some(Some(5)));</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// sink2.send(2);</span> + <span class='doccomment'>/// assert_eq!(index.next(), Some(None));</span> + <span class='doccomment'>/// ```</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>snapshot</span><span class='op'><</span><span class='ident'>B</span>, <span class='ident'>C</span>, <span class='ident'>F</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='self'>self</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'>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='kw-2'>&</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='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>snapshot</span>(<span class='ident'>stream</span>, <span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> <span class='ident'>f</span>(<span class='kw-2'>&</span><span class='ident'>a</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>(), <span class='ident'>b</span>)) + } + + <span class='doccomment'>/// Similar to `lift2`. Combines a `SignalMut` with a `Signal` using a</span> + <span class='doccomment'>/// function. The function takes its first argument by reference.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>combine</span><span class='op'><</span><span class='ident'>B</span>, <span class='ident'>C</span>, <span class='ident'>F</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>signal</span>: <span class='kw-2'>&</span><span class='ident'>Signal</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'>Signal</span><span class='op'><</span><span class='ident'>C</span><span class='op'>></span> + <span class='kw'>where</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='kw-2'>&</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'>lift</span>::<span class='ident'>lift2</span>( + <span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> <span class='ident'>f</span>(<span class='kw-2'>&</span><span class='ident'>a</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>(), <span class='ident'>b</span>), + <span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>inner</span>, <span class='kw-2'>&</span><span class='ident'>signal</span> + ) + } + + <span class='doccomment'>/// Similar to `lift2`, but combines two `SignalMut` using a function. The</span> + <span class='doccomment'>/// supplied function takes both arguments by reference.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// # Example</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 sum = sink.stream().scan_mut(0, |sum, a| *sum += a);</span> + <span class='doccomment'>/// let product = sink.stream().scan_mut(1, |prod, a| *prod *= a);</span> + <span class='doccomment'>/// let combo = sum.combine_mut(&product, |s, p| (*s, *p));</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// sink.send(1);</span> + <span class='doccomment'>/// assert_eq!(combo.sample(), (1, 1));</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// sink.send(3);</span> + <span class='doccomment'>/// assert_eq!(combo.sample(), (4, 3));</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// sink.send(5);</span> + <span class='doccomment'>/// assert_eq!(combo.sample(), (9, 15));</span> + <span class='doccomment'>/// ```</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>combine_mut</span><span class='op'><</span><span class='ident'>B</span>, <span class='ident'>C</span>, <span class='ident'>F</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&</span><span class='ident'>SignalMut</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'>Signal</span><span class='op'><</span><span class='ident'>C</span><span class='op'>></span> + <span class='kw'>where</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='kw-2'>&</span><span class='ident'>A</span>, <span class='kw-2'>&</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'>lift</span>::<span class='ident'>lift2</span>( + <span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> <span class='ident'>f</span>(<span class='kw-2'>&</span><span class='ident'>a</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>(), <span class='kw-2'>&</span><span class='ident'>b</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>()), + <span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>inner</span>, <span class='kw-2'>&</span><span class='ident'>other</span>.<span class='ident'>inner</span> + ) + } +} + + +<span class='doccomment'>/// Same as Stream::hold.</span> +<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>hold</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span>(<span class='ident'>initial</span>: <span class='ident'>A</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'>Signal</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></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='lifetime'>'static</span>, +{ + <span class='ident'>commit</span>(<span class='op'>||</span> { + <span class='kw'>let</span> <span class='ident'>signal</span> <span class='op'>=</span> <span class='ident'>Signal</span>::<span class='ident'>build</span>(<span class='ident'>SignalFn</span>::<span class='ident'>Const</span>(<span class='ident'>initial</span>), <span class='ident'>stream</span>.<span class='ident'>clone</span>()); + <span class='ident'>reg_signal</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>stream</span>::<span class='ident'>source</span>(<span class='kw-2'>&</span><span class='ident'>stream</span>).<span class='ident'>write</span>().<span class='ident'>unwrap</span>(), <span class='kw-2'>&</span><span class='ident'>signal</span>, <span class='ident'>SignalFn</span>::<span class='ident'>Const</span>); + <span class='ident'>signal</span> + }) +} + + +<span class='doccomment'>/// Same as Stream::scan_mut.</span> +<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>scan_mut</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span>, <span class='ident'>F</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='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'>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='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'>commit</span>(<span class='kw'>move</span> <span class='op'>||</span> { + <span class='kw'>let</span> <span class='ident'>state</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'>initial</span>)); + <span class='kw'>let</span> <span class='ident'>signal</span> <span class='op'>=</span> <span class='ident'>Signal</span>::<span class='ident'>build</span>(<span class='ident'>SignalFn</span>::<span class='ident'>Const</span>(<span class='ident'>readonly</span>::<span class='ident'>create</span>(<span class='ident'>state</span>.<span class='ident'>clone</span>())), <span class='ident'>stream</span>.<span class='ident'>clone</span>()); + <span class='ident'>reg_signal</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>stream</span>::<span class='ident'>source</span>(<span class='kw-2'>&</span><span class='ident'>stream</span>).<span class='ident'>write</span>().<span class='ident'>unwrap</span>(), <span class='kw-2'>&</span><span class='ident'>signal</span>, + <span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> { <span class='ident'>f</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>state</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>(), <span class='ident'>a</span>); <span class='ident'>SignalFn</span>::<span class='ident'>Const</span>(<span class='ident'>readonly</span>::<span class='ident'>create</span>(<span class='ident'>state</span>.<span class='ident'>clone</span>())) }); + <span class='ident'>SignalMut</span> { <span class='ident'>inner</span>: <span class='ident'>signal</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'>quickcheck</span>::<span class='ident'>quickcheck</span>; + + <span class='kw'>use</span> ::<span class='ident'>stream</span>::<span class='ident'>Sink</span>; + <span class='kw'>use</span> ::<span class='ident'>signal</span>::{ <span class='self'>self</span>, <span class='ident'>Signal</span>, <span class='ident'>SignalCycle</span> }; + <span class='kw'>use</span> ::<span class='ident'>lift</span>::<span class='ident'>lift1</span>; + <span class='kw'>use</span> ::<span class='ident'>testing</span>::{ <span class='ident'>ArcFn</span>, <span class='ident'>signal_eq</span>, <span class='ident'>id</span>, <span class='ident'>pure_fn</span>, <span class='ident'>partial_comp</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'>signal</span>: <span class='ident'>Signal</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>) <span class='op'>-></span> <span class='ident'>bool</span> { + <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>signal_eq</span>(<span class='kw-2'>&</span><span class='ident'>signal</span>, <span class='kw-2'>&</span><span class='ident'>lift1</span>(<span class='ident'>id</span>, <span class='kw-2'>&</span><span class='ident'>signal</span>)); + (<span class='number'>0</span>..<span class='number'>10</span>).<span class='ident'>all</span>(<span class='op'>|</span>_<span class='op'>|</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'>Signal</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>) <span class='op'>-></span> <span class='ident'>bool</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'>signal</span>: <span class='ident'>Signal</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>) <span class='op'>-></span> <span class='ident'>bool</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'>i32</span> { <span class='number'>3</span> <span class='op'>*</span> <span class='ident'>n</span> } + <span class='kw'>fn</span> <span class='ident'>g</span>(<span class='ident'>n</span>: <span class='ident'>i32</span>) <span class='op'>-></span> <span class='ident'>i32</span> { <span class='ident'>n</span> <span class='op'>+</span> <span class='number'>2</span> } + <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>signal_eq</span>( + <span class='kw-2'>&</span><span class='ident'>lift1</span>(<span class='op'>|</span><span class='ident'>n</span><span class='op'>|</span> <span class='ident'>f</span>(<span class='ident'>g</span>(<span class='ident'>n</span>)), <span class='kw-2'>&</span><span class='ident'>signal</span>), + <span class='kw-2'>&</span><span class='ident'>lift1</span>(<span class='ident'>f</span>, <span class='kw-2'>&</span><span class='ident'>lift1</span>(<span class='ident'>g</span>, <span class='kw-2'>&</span><span class='ident'>signal</span>)) + ); + (<span class='number'>0</span>..<span class='number'>10</span>).<span class='ident'>all</span>(<span class='op'>|</span>_<span class='op'>|</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'>Signal</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>) <span class='op'>-></span> <span class='ident'>bool</span>); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>applicative_identity</span>() { + <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>signal</span>: <span class='ident'>Signal</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>) <span class='op'>-></span> <span class='ident'>bool</span> { + <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>signal_eq</span>(<span class='kw-2'>&</span><span class='ident'>pure_fn</span>(<span class='ident'>id</span>).<span class='ident'>apply</span>(<span class='kw-2'>&</span><span class='ident'>signal</span>), <span class='kw-2'>&</span><span class='ident'>signal</span>); + (<span class='number'>0</span>..<span class='number'>10</span>).<span class='ident'>all</span>(<span class='op'>|</span>_<span class='op'>|</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'>Signal</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>) <span class='op'>-></span> <span class='ident'>bool</span>); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>applicative_composition</span>() { + <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>signal</span>: <span class='ident'>Signal</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>) <span class='op'>-></span> <span class='ident'>bool</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'>i32</span> { <span class='ident'>n</span> <span class='op'>*</span> <span class='number'>4</span> } + <span class='kw'>fn</span> <span class='ident'>g</span>(<span class='ident'>n</span>: <span class='ident'>i32</span>) <span class='op'>-></span> <span class='ident'>i32</span> { <span class='ident'>n</span> <span class='op'>-</span> <span class='number'>3</span> } + <span class='kw'>let</span> <span class='ident'>u</span> <span class='op'>=</span> <span class='ident'>pure_fn</span>(<span class='ident'>f</span>); + <span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='ident'>pure_fn</span>(<span class='ident'>g</span>); + <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>signal_eq</span>( + <span class='kw-2'>&</span><span class='ident'>pure_fn</span>(<span class='ident'>partial_comp</span>).<span class='ident'>apply</span>(<span class='kw-2'>&</span><span class='ident'>u</span>).<span class='ident'>apply</span>(<span class='kw-2'>&</span><span class='ident'>v</span>).<span class='ident'>apply</span>(<span class='kw-2'>&</span><span class='ident'>signal</span>), + <span class='kw-2'>&</span><span class='ident'>u</span>.<span class='ident'>apply</span>(<span class='kw-2'>&</span><span class='ident'>v</span>.<span class='ident'>apply</span>(<span class='kw-2'>&</span><span class='ident'>signal</span>)) + ); + (<span class='number'>0</span>..<span class='number'>10</span>).<span class='ident'>all</span>(<span class='op'>|</span>_<span class='op'>|</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'>Signal</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span>) <span class='op'>-></span> <span class='ident'>bool</span>); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>applicative_homomorphism</span>() { + <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>x</span>: <span class='ident'>i32</span>) <span class='op'>-></span> <span class='ident'>bool</span> { + <span class='kw'>fn</span> <span class='ident'>f</span>(<span class='ident'>x</span>: <span class='ident'>i32</span>) <span class='op'>-></span> <span class='ident'>i32</span> { <span class='ident'>x</span> <span class='op'>*</span> (<span class='op'>-</span><span class='number'>5</span>) } + <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>signal_eq</span>( + <span class='kw-2'>&</span><span class='ident'>pure_fn</span>(<span class='ident'>f</span>).<span class='ident'>apply</span>(<span class='kw-2'>&</span><span class='ident'>Signal</span>::<span class='ident'>new</span>(<span class='ident'>x</span>)), + <span class='kw-2'>&</span><span class='ident'>Signal</span>::<span class='ident'>new</span>(<span class='ident'>f</span>(<span class='ident'>x</span>)) + ); + (<span class='number'>0</span>..<span class='number'>10</span>).<span class='ident'>all</span>(<span class='op'>|</span>_<span class='op'>|</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'>i32</span>) <span class='op'>-></span> <span class='ident'>bool</span>); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>applicative_interchange</span>() { + <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>x</span>: <span class='ident'>i32</span>) <span class='op'>-></span> <span class='ident'>bool</span> { + <span class='kw'>fn</span> <span class='ident'>f</span>(<span class='ident'>x</span>: <span class='ident'>i32</span>) <span class='op'>-></span> <span class='ident'>i32</span> { <span class='ident'>x</span> <span class='op'>*</span> <span class='number'>2</span> <span class='op'>-</span> <span class='number'>7</span> } + <span class='kw'>let</span> <span class='ident'>u</span> <span class='op'>=</span> <span class='ident'>pure_fn</span>(<span class='ident'>f</span>); + <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>signal_eq</span>( + <span class='kw-2'>&</span><span class='ident'>u</span>.<span class='ident'>apply</span>(<span class='kw-2'>&</span><span class='ident'>Signal</span>::<span class='ident'>new</span>(<span class='ident'>x</span>)), + <span class='kw-2'>&</span><span class='ident'>pure_fn</span>(<span class='kw'>move</span> <span class='op'>|</span><span class='ident'>f</span>: <span class='ident'>ArcFn</span><span class='op'><</span><span class='ident'>i32</span>, <span class='ident'>i32</span><span class='op'>></span><span class='op'>|</span> <span class='ident'>f</span>(<span class='ident'>x</span>)).<span class='ident'>apply</span>(<span class='kw-2'>&</span><span class='ident'>u</span>) + ); + (<span class='number'>0</span>..<span class='number'>10</span>).<span class='ident'>all</span>(<span class='op'>|</span>_<span class='op'>|</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'>i32</span>) <span class='op'>-></span> <span class='ident'>bool</span>); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>clone</span>() { + <span class='kw'>let</span> <span class='ident'>b</span> <span class='op'>=</span> <span class='ident'>Signal</span>::<span class='ident'>new</span>(<span class='number'>3</span>); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>b</span>.<span class='ident'>clone</span>().<span class='ident'>sample</span>(), <span class='number'>3</span>); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>hold</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'>signal</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='number'>3</span>); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>signal</span>.<span class='ident'>sample</span>(), <span class='number'>3</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'>signal</span>.<span class='ident'>sample</span>(), <span class='number'>4</span>); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>hold_implicit_stream</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'>signal</span> <span class='op'>=</span> <span class='ident'>signal</span>::<span class='ident'>hold</span>(<span class='number'>0</span>, <span class='kw-2'>&</span><span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>n</span><span class='op'>|</span> <span class='number'>2</span> <span class='op'>*</span> <span class='ident'>n</span>)); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>signal</span>.<span class='ident'>sample</span>(), <span class='number'>0</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'>signal</span>.<span class='ident'>sample</span>(), <span class='number'>8</span>); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>snapshot</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'>f64</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'>snap_events</span> <span class='op'>=</span> <span class='ident'>sink1</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='number'>1</span>) + .<span class='ident'>snapshot</span>(<span class='kw-2'>&</span><span class='ident'>sink2</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'>3.0</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='ident'>b</span>)) + .<span class='ident'>events</span>(); + <span class='ident'>sink2</span>.<span class='ident'>send</span>(<span class='number'>4.0</span>); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>snap_events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>((<span class='number'>1</span>, <span class='number'>7.0</span>))); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>snapshot_2</span>() { + <span class='kw'>let</span> <span class='ident'>ev1</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>beh1</span> <span class='op'>=</span> <span class='ident'>ev1</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='number'>5</span>); + <span class='kw'>let</span> <span class='ident'>ev2</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>snap</span> <span class='op'>=</span> <span class='ident'>beh1</span>.<span class='ident'>snapshot</span>(<span class='kw-2'>&</span><span class='ident'>ev2</span>.<span class='ident'>stream</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='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'>snap</span>.<span class='ident'>events</span>(); + <span class='ident'>ev2</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'>5</span>, <span class='number'>4</span>))); + <span class='ident'>ev1</span>.<span class='ident'>send</span>(<span class='op'>-</span><span class='number'>2</span>); + <span class='ident'>ev2</span>.<span class='ident'>send</span>(<span class='number'>6</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='op'>-</span><span class='number'>2</span>, <span class='number'>6</span>))); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>cyclic_snapshot_accum</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='kw'>let</span> <span class='ident'>accum</span> <span class='op'>=</span> <span class='ident'>SignalCycle</span>::<span class='ident'>new</span>(); + <span class='kw'>let</span> <span class='ident'>def</span> <span class='op'>=</span> <span class='ident'>accum</span>.<span class='ident'>snapshot</span>(<span class='kw-2'>&</span><span class='ident'>stream</span>, <span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>s</span><span class='op'>|</span> <span class='ident'>a</span> <span class='op'>+</span> <span class='ident'>s</span>).<span class='ident'>hold</span>(<span class='number'>0</span>); + <span class='kw'>let</span> <span class='ident'>accum</span> <span class='op'>=</span> <span class='ident'>accum</span>.<span class='ident'>define</span>(<span class='ident'>def</span>); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>accum</span>.<span class='ident'>sample</span>(), <span class='number'>0</span>); + <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>3</span>); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>accum</span>.<span class='ident'>sample</span>(), <span class='number'>3</span>); + <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>7</span>); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>accum</span>.<span class='ident'>sample</span>(), <span class='number'>10</span>); + <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='op'>-</span><span class='number'>21</span>); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>accum</span>.<span class='ident'>sample</span>(), <span class='op'>-</span><span class='number'>11</span>); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>snapshot_order_standard</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'>signal</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='number'>0</span>); + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>signal</span> + .<span class='ident'>snapshot</span>(<span class='kw-2'>&</span><span class='ident'>sink</span>.<span class='ident'>stream</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='ident'>b</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'>0</span>, <span class='number'>1</span>))); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>snapshot_lift_order_standard</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'>signal</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='number'>0</span>); + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>lift1</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span>, <span class='kw-2'>&</span><span class='ident'>signal</span>) + .<span class='ident'>snapshot</span>(<span class='kw-2'>&</span><span class='ident'>sink</span>.<span class='ident'>stream</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='ident'>b</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'>0</span>, <span class='number'>1</span>))); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>snapshot_order_alternative</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'>// Invert the "natural" order of the registry by declaring the stream before</span> + <span class='comment'>// the signal, which are both used by the snapshot.</span> + <span class='kw'>let</span> <span class='ident'>first</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='kw'>let</span> <span class='ident'>signal</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='number'>0</span>); + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>signal</span>.<span class='ident'>snapshot</span>(<span class='kw-2'>&</span><span class='ident'>first</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='ident'>b</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'>0</span>, <span class='number'>1</span>))); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>cyclic_signal_intermediate</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='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>snap</span> <span class='op'>=</span> <span class='prelude-val'>None</span>; + <span class='kw'>let</span> <span class='ident'>sum</span> <span class='op'>=</span> <span class='ident'>Signal</span>::<span class='ident'>cyclic</span>(<span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> { + <span class='kw'>let</span> <span class='ident'>my_snap</span> <span class='op'>=</span> <span class='ident'>a</span>.<span class='ident'>snapshot</span>(<span class='kw-2'>&</span><span class='ident'>stream</span>, <span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>e</span><span class='op'>|</span> <span class='ident'>e</span> <span class='op'>+</span> <span class='ident'>a</span>); + <span class='ident'>snap</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='ident'>my_snap</span>.<span class='ident'>clone</span>()); + <span class='ident'>my_snap</span>.<span class='ident'>hold</span>(<span class='number'>0</span>) + }); + <span class='kw'>let</span> <span class='ident'>snap</span> <span class='op'>=</span> <span class='ident'>snap</span>.<span class='ident'>unwrap</span>(); + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>snap</span>.<span class='ident'>events</span>(); + + <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>3</span>); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>sum</span>.<span class='ident'>sample</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'>3</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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