<!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 `C:\Users\Chrilieb\.cargo\registry\src\github.com-1ecc6299db9ec823\odds-0.2.25\src\fix.rs`.">
<meta name="keywords" content="rust, rustlang, rust-lang">
<title>fix.rs.html -- source</title>
<link rel="stylesheet" type="text/css" href="../../normalize.css">
<link rel="stylesheet" type="text/css" href="../../rustdoc.css">
<link rel="stylesheet" type="text/css" href="../../main.css">
</head>
<body class="rustdoc source">
<!--[if lte IE 8]>
<div class="warning">
This old browser is unsupported and will most likely display funky
things.
</div>
<![endif]-->
<nav class="sidebar">
</nav>
<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"><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 id="29"> 29</span>
<span id="30"> 30</span>
<span id="31"> 31</span>
<span id="32"> 32</span>
<span id="33"> 33</span>
<span id="34"> 34</span>
<span id="35"> 35</span>
<span id="36"> 36</span>
<span id="37"> 37</span>
<span id="38"> 38</span>
<span id="39"> 39</span>
<span id="40"> 40</span>
<span id="41"> 41</span>
<span id="42"> 42</span>
<span id="43"> 43</span>
<span id="44"> 44</span>
<span id="45"> 45</span>
<span id="46"> 46</span>
<span id="47"> 47</span>
<span id="48"> 48</span>
<span id="49"> 49</span>
<span id="50"> 50</span>
<span id="51"> 51</span>
<span id="52"> 52</span>
<span id="53"> 53</span>
<span id="54"> 54</span>
<span id="55"> 55</span>
<span id="56"> 56</span>
<span id="57"> 57</span>
<span id="58"> 58</span>
<span id="59"> 59</span>
<span id="60"> 60</span>
<span id="61"> 61</span>
<span id="62"> 62</span>
<span id="63"> 63</span>
<span id="64"> 64</span>
<span id="65"> 65</span>
<span id="66"> 66</span>
<span id="67"> 67</span>
<span id="68"> 68</span>
<span id="69"> 69</span>
<span id="70"> 70</span>
<span id="71"> 71</span>
<span id="72"> 72</span>
<span id="73"> 73</span>
<span id="74"> 74</span>
<span id="75"> 75</span>
<span id="76"> 76</span>
<span id="77"> 77</span>
<span id="78"> 78</span>
<span id="79"> 79</span>
<span id="80"> 80</span>
<span id="81"> 81</span>
<span id="82"> 82</span>
<span id="83"> 83</span>
<span id="84"> 84</span>
<span id="85"> 85</span>
<span id="86"> 86</span>
<span id="87"> 87</span>
<span id="88"> 88</span>
<span id="89"> 89</span>
<span id="90"> 90</span>
<span id="91"> 91</span>
<span id="92"> 92</span>
<span id="93"> 93</span>
<span id="94"> 94</span>
<span id="95"> 95</span>
<span id="96"> 96</span>
<span id="97"> 97</span>
<span id="98"> 98</span>
<span id="99"> 99</span>
<span id="100">100</span>
<span id="101">101</span>
<span id="102">102</span>
<span id="103">103</span>
<span id="104">104</span>
<span id="105">105</span>
<span id="106">106</span>
<span id="107">107</span>
<span id="108">108</span>
<span id="109">109</span>
<span id="110">110</span>
<span id="111">111</span>
<span id="112">112</span>
<span id="113">113</span>
<span id="114">114</span>
<span id="115">115</span>
</pre><pre class="rust ">
<span class="doccomment">/// Fixpoint combinator for rust closures, generalized over the return type.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In **Fix\<T, R\>**, **T** is the argument type, and **R** is the return type,</span>
<span class="doccomment">/// **R** defaults to **T**.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Calling the `Fix` value only supports function call notation with the nightly</span>
<span class="doccomment">/// channel and the crate feature ‘unstable’ enabled; use the .call() method otherwise.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Use this best through the `fix` function.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use odds::Fix;</span>
<span class="doccomment">/// use odds::fix;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = |f: Fix<i32>, x| if x == 0 { 1 } else { x * f.call(x - 1) };</span>
<span class="doccomment">/// let fact = Fix(&c);</span>
<span class="doccomment">/// assert_eq!(fact.call(5), 120);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let data = [true, false];</span>
<span class="doccomment">/// assert!(!fix(&data[..], |f, x| {</span>
<span class="doccomment">/// x.len() == 0 || x[0] && f.call(&x[1..])</span>
<span class="doccomment">/// }));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"unstable"</span>, <span class="ident">doc</span><span class="op">=</span><span class="string">"
```
// using feature `unstable`
use odds::Fix;
let c = |f: Fix<i32>, x| if x == 0 { 1 } else { x * f(x - 1) };
let fact = Fix(&c);
assert_eq!(fact(5), 120);
```
"</span>
)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Fix</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span>, <span class="ident">R</span>: <span class="lifetime">'a</span> <span class="op">=</span> <span class="ident">T</span><span class="op">></span>(<span class="kw">pub</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Fn</span>(<span class="ident">Fix</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">R</span><span class="op">></span>, <span class="ident">T</span>) <span class="op">-></span> <span class="ident">R</span>);
<span class="doccomment">/// Fixpoint combinator for rust closures, generalized over the return type.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is a wrapper function that uses the `Fix` type. The recursive closure</span>
<span class="doccomment">/// has two arguments, `Fix` and the argument type `T`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In **Fix\<T, R\>**, **T** is the argument type, and **R** is the return type,</span>
<span class="doccomment">/// **R** defaults to **T**.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Calling the `Fix` value only supports function call notation with the nightly</span>
<span class="doccomment">/// channel and the crate feature ‘unstable’ enabled; use the .call() method otherwise.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This helper function makes the type inference work out well.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use odds::fix;</span>
<span class="doccomment">/// </span>
<span class="doccomment">/// assert_eq!(120, fix(5, |f, x| if x == 0 { 1 } else { x * f.call(x - 1) }));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let data = [true, false];</span>
<span class="doccomment">/// assert!(!fix(&data[..], |f, x| {</span>
<span class="doccomment">/// x.len() == 0 || x[0] && f.call(&x[1..])</span>
<span class="doccomment">/// }));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"unstable"</span>, <span class="ident">doc</span><span class="op">=</span><span class="string">"
```
// using feature `unstable`
use odds::fix;
assert_eq!(120, fix(5, |f, x| if x == 0 { 1 } else { x * f(x - 1) }));
```
"</span>
)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fix</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">R</span>, <span class="ident">F</span><span class="op">></span>(<span class="ident">init</span>: <span class="ident">T</span>, <span class="ident">closure</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">R</span>
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">Fn</span>(<span class="ident">Fix</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">R</span><span class="op">></span>, <span class="ident">T</span>) <span class="op">-></span> <span class="ident">R</span>
{
<span class="ident">Fix</span>(<span class="kw-2">&</span><span class="ident">closure</span>).<span class="ident">call</span>(<span class="ident">init</span>)
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">R</span><span class="op">></span> <span class="ident">Fix</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">R</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="ident">arg</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">R</span> {
<span class="kw">let</span> <span class="ident">f</span> <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span>;
<span class="ident">f</span>.<span class="number">0</span>(<span class="ident">f</span>, <span class="ident">arg</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">R</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Fix</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">R</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="self">Self</span> { <span class="kw-2">*</span><span class="self">self</span> }
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">R</span><span class="op">></span> <span class="ident">Copy</span> <span class="kw">for</span> <span class="ident">Fix</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">R</span><span class="op">></span> { }
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"unstable"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">R</span><span class="op">></span> <span class="ident">FnOnce</span><span class="op"><</span>(<span class="ident">T</span>,)<span class="op">></span> <span class="kw">for</span> <span class="ident">Fix</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">R</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">R</span>;
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">extern</span> <span class="string">"rust-call"</span> <span class="kw">fn</span> <span class="ident">call_once</span>(<span class="self">self</span>, <span class="ident">x</span>: (<span class="ident">T</span>,)) <span class="op">-></span> <span class="ident">R</span> {
<span class="self">self</span>.<span class="ident">call</span>(<span class="ident">x</span>.<span class="number">0</span>)
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"unstable"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">R</span><span class="op">></span> <span class="ident">FnMut</span><span class="op"><</span>(<span class="ident">T</span>,)<span class="op">></span> <span class="kw">for</span> <span class="ident">Fix</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">R</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">extern</span> <span class="string">"rust-call"</span> <span class="kw">fn</span> <span class="ident">call_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">x</span>: (<span class="ident">T</span>,)) <span class="op">-></span> <span class="ident">R</span> {
<span class="self">self</span>.<span class="ident">call</span>(<span class="ident">x</span>.<span class="number">0</span>)
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"unstable"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">R</span><span class="op">></span> <span class="ident">Fn</span><span class="op"><</span>(<span class="ident">T</span>,)<span class="op">></span> <span class="kw">for</span> <span class="ident">Fix</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">R</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">extern</span> <span class="string">"rust-call"</span> <span class="kw">fn</span> <span class="ident">call</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">x</span>: (<span class="ident">T</span>,)) <span class="op">-></span> <span class="ident">R</span> {
<span class="self">self</span>.<span class="ident">call</span>(<span class="ident">x</span>.<span class="number">0</span>)
}
}
</pre>
</section>
<section id='search' class="content hidden"></section>
<section class="footer"></section>
<aside id="help" class="hidden">
<div>
<h1 class="hidden">Help</h1>
<div class="shortcuts">
<h2>Keyboard Shortcuts</h2>
<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>
<dt>+</dt>
<dd>Collapse/expand all sections</dd>
</dl>
</div>
<div class="infos">
<h2>Search Tricks</h2>
<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>type</code>, <code>macro</code>,
and <code>const</code>.
</p>
<p>
Search functions by type signature (e.g.
<code>vec -> usize</code> or <code>* -> vec</code>)
</p>
</div>
</div>
</aside>
<script>
window.rootPath = "../../";
window.currentCrate = "odds";
</script>
<script src="../../jquery.js"></script>
<script src="../../main.js"></script>
<script defer src="../../search-index.js"></script>
</body>
</html>