<!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 `/Users/travis/.cargo/registry/src/github.com-1ecc6299db9ec823/failure-0.1.1/src/context.rs`.">
<meta name="keywords" content="rust, rustlang, rust-lang">
<title>context.rs.html -- source</title>
<link rel="stylesheet" type="text/css" href="../../normalize.css">
<link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle">
<link rel="stylesheet" type="text/css" href="../../dark.css">
<link rel="stylesheet" type="text/css" href="../../main.css" id="themeStyle">
<script src="../../storage.js"></script>
</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">
<div class="sidebar-menu">☰</div>
</nav>
<div class="theme-picker">
<button id="theme-picker" aria-label="Pick another theme!">
<img src="../../brush.svg" width="18" alt="Pick another theme!">
</button>
<div id="theme-choices"></div>
</div>
<script src="../../theme.js"></script>
<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>
<span id="116">116</span>
<span id="117">117</span>
<span id="118">118</span>
<span id="119">119</span>
<span id="120">120</span>
<span id="121">121</span>
<span id="122">122</span>
<span id="123">123</span>
<span id="124">124</span>
<span id="125">125</span>
<span id="126">126</span>
<span id="127">127</span>
<span id="128">128</span>
<span id="129">129</span>
<span id="130">130</span>
<span id="131">131</span>
<span id="132">132</span>
<span id="133">133</span>
<span id="134">134</span>
<span id="135">135</span>
<span id="136">136</span>
<span id="137">137</span>
<span id="138">138</span>
<span id="139">139</span>
<span id="140">140</span>
<span id="141">141</span>
<span id="142">142</span>
</pre><pre class="rust ">
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">fmt</span>::{<span class="self">self</span>, <span class="ident">Display</span>, <span class="ident">Debug</span>};
<span class="kw">use</span> <span class="ident">Fail</span>;
<span class="macro">without_std</span><span class="macro">!</span> {
<span class="doccomment">/// An error with context around it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The context is intended to be a human-readable, user-facing explanation for the</span>
<span class="doccomment">/// error that has occurred. The underlying error is not assumed to be end-user-relevant</span>
<span class="doccomment">/// information.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `Display` impl for `Context` only prints the human-readable context, while the</span>
<span class="doccomment">/// `Debug` impl also prints the underlying error.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Context</span><span class="op"><</span><span class="ident">D</span>: <span class="ident">Display</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">context</span>: <span class="ident">D</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">D</span>: <span class="ident">Display</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">Context</span><span class="op"><</span><span class="ident">D</span><span class="op">></span> {
<span class="doccomment">/// Creates a new context without an underlying error message.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">context</span>: <span class="ident">D</span>) <span class="op">-></span> <span class="ident">Context</span><span class="op"><</span><span class="ident">D</span><span class="op">></span> {
<span class="ident">Context</span> { <span class="ident">context</span> }
}
<span class="doccomment">/// Returns a reference to the context provided with this error.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_context</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">D</span> {
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">context</span>
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">with_err</span><span class="op"><</span><span class="ident">E</span>: <span class="ident">Fail</span><span class="op">></span>(<span class="ident">context</span>: <span class="ident">D</span>, _: <span class="ident">E</span>) <span class="op">-></span> <span class="ident">Context</span><span class="op"><</span><span class="ident">D</span><span class="op">></span> {
<span class="ident">Context</span> { <span class="ident">context</span> }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">D</span>: <span class="ident">Display</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">Fail</span> <span class="kw">for</span> <span class="ident">Context</span><span class="op"><</span><span class="ident">D</span><span class="op">></span> { }
<span class="kw">impl</span><span class="op"><</span><span class="ident">D</span>: <span class="ident">Display</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">Debug</span> <span class="kw">for</span> <span class="ident">Context</span><span class="op"><</span><span class="ident">D</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">f</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="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{}"</span>, <span class="self">self</span>.<span class="ident">context</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">D</span>: <span class="ident">Display</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">Display</span> <span class="kw">for</span> <span class="ident">Context</span><span class="op"><</span><span class="ident">D</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">f</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="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{}"</span>, <span class="self">self</span>.<span class="ident">context</span>)
}
}
}
<span class="macro">with_std</span><span class="macro">!</span> {
<span class="kw">use</span> {<span class="ident">Error</span>, <span class="ident">Backtrace</span>};
<span class="doccomment">/// An error with context around it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The context is intended to be a human-readable, user-facing explanation for the</span>
<span class="doccomment">/// error that has occurred. The underlying error is not assumed to be end-user-relevant</span>
<span class="doccomment">/// information.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `Display` impl for `Context` only prints the human-readable context, while the</span>
<span class="doccomment">/// `Debug` impl also prints the underlying error.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Context</span><span class="op"><</span><span class="ident">D</span>: <span class="ident">Display</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">context</span>: <span class="ident">D</span>,
<span class="ident">failure</span>: <span class="ident">Either</span><span class="op"><</span><span class="ident">Backtrace</span>, <span class="ident">Error</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">D</span>: <span class="ident">Display</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">Context</span><span class="op"><</span><span class="ident">D</span><span class="op">></span> {
<span class="doccomment">/// Creates a new context without an underlying error message.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">context</span>: <span class="ident">D</span>) <span class="op">-></span> <span class="ident">Context</span><span class="op"><</span><span class="ident">D</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">failure</span> <span class="op">=</span> <span class="ident">Either</span>::<span class="ident">This</span>(<span class="ident">Backtrace</span>::<span class="ident">new</span>());
<span class="ident">Context</span> { <span class="ident">context</span>, <span class="ident">failure</span> }
}
<span class="doccomment">/// Returns a reference to the context provided with this error.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_context</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">D</span> {
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">context</span>
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">with_err</span><span class="op"><</span><span class="ident">E</span>: <span class="ident">Into</span><span class="op"><</span><span class="ident">Error</span><span class="op">>></span>(<span class="ident">context</span>: <span class="ident">D</span>, <span class="ident">error</span>: <span class="ident">E</span>) <span class="op">-></span> <span class="ident">Context</span><span class="op"><</span><span class="ident">D</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">failure</span> <span class="op">=</span> <span class="ident">Either</span>::<span class="ident">That</span>(<span class="ident">error</span>.<span class="ident">into</span>());
<span class="ident">Context</span> { <span class="ident">context</span>, <span class="ident">failure</span> }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">D</span>: <span class="ident">Display</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">Fail</span> <span class="kw">for</span> <span class="ident">Context</span><span class="op"><</span><span class="ident">D</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">cause</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">Fail</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">failure</span>.<span class="ident">cause</span>()
}
<span class="kw">fn</span> <span class="ident">backtrace</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">Backtrace</span><span class="op">></span> {
<span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">failure</span>.<span class="ident">backtrace</span>())
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">D</span>: <span class="ident">Display</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">Debug</span> <span class="kw">for</span> <span class="ident">Context</span><span class="op"><</span><span class="ident">D</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">f</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="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{:?}\n\n{}"</span>, <span class="self">self</span>.<span class="ident">failure</span>, <span class="self">self</span>.<span class="ident">context</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">D</span>: <span class="ident">Display</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">Display</span> <span class="kw">for</span> <span class="ident">Context</span><span class="op"><</span><span class="ident">D</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">f</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="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{}"</span>, <span class="self">self</span>.<span class="ident">context</span>)
}
}
<span class="kw">enum</span> <span class="ident">Either</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">B</span><span class="op">></span> {
<span class="ident">This</span>(<span class="ident">A</span>),
<span class="ident">That</span>(<span class="ident">B</span>),
}
<span class="kw">impl</span> <span class="ident">Either</span><span class="op"><</span><span class="ident">Backtrace</span>, <span class="ident">Error</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">backtrace</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">Backtrace</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">Either</span>::<span class="ident">This</span>(<span class="kw-2">ref</span> <span class="ident">backtrace</span>) <span class="op">=></span> <span class="ident">backtrace</span>,
<span class="ident">Either</span>::<span class="ident">That</span>(<span class="kw-2">ref</span> <span class="ident">error</span>) <span class="op">=></span> <span class="ident">error</span>.<span class="ident">backtrace</span>(),
}
}
<span class="kw">fn</span> <span class="ident">cause</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">Fail</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">Either</span>::<span class="ident">This</span>(_) <span class="op">=></span> <span class="prelude-val">None</span>,
<span class="ident">Either</span>::<span class="ident">That</span>(<span class="kw-2">ref</span> <span class="ident">error</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">error</span>.<span class="ident">cause</span>())
}
}
}
<span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Either</span><span class="op"><</span><span class="ident">Backtrace</span>, <span class="ident">Error</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">f</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="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">Either</span>::<span class="ident">This</span>(<span class="kw-2">ref</span> <span class="ident">backtrace</span>) <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{:?}"</span>, <span class="ident">backtrace</span>),
<span class="ident">Either</span>::<span class="ident">That</span>(<span class="kw-2">ref</span> <span class="ident">error</span>) <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{:?}"</span>, <span class="ident">error</span>),
}
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">D</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">D</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Context</span><span class="op"><</span><span class="ident">D</span><span class="op">></span> <span class="kw">where</span>
<span class="ident">D</span>: <span class="ident">Display</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">fn</span> <span class="ident">from</span>(<span class="ident">display</span>: <span class="ident">D</span>) <span class="op">-></span> <span class="ident">Context</span><span class="op"><</span><span class="ident">D</span><span class="op">></span> {
<span class="ident">Context</span>::<span class="ident">new</span>(<span class="ident">display</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><kbd>?</kbd></dt>
<dd>Show this help dialog</dd>
<dt><kbd>S</kbd></dt>
<dd>Focus the search field</dd>
<dt><kbd>↑</kbd></dt>
<dd>Move up in search results</dd>
<dt><kbd>↓</kbd></dt>
<dd>Move down in search results</dd>
<dt><kbd>↹</kbd></dt>
<dd>Switch tab</dd>
<dt><kbd>⏎</kbd></dt>
<dd>Go to active search result</dd>
<dt><kbd>+</kbd></dt>
<dd>Expand all sections</dd>
<dt><kbd>-</kbd></dt>
<dd>Collapse 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 = "failure";
</script>
<script src="../../main.js"></script>
<script defer src="../../search-index.js"></script>
</body>
</html>