178 lines
8.8 KiB
HTML
178 lines
8.8 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta name="generator" content="rustdoc">
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<meta name="description" content="API documentation for the Rust `memoffset` crate.">
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<meta name="keywords" content="rust, rustlang, rust-lang, memoffset">
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<title>memoffset - Rust</title>
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<link rel="stylesheet" type="text/css" href="../normalize.css">
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</head>
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<body class="rustdoc mod">
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<div class="warning">
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This old browser is unsupported and will most likely display funky
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things.
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<![endif]-->
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<nav class="sidebar">
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<div class="sidebar-menu">☰</div>
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<p class='location'>Crate memoffset</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#macros">Macros</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'memoffset', ty: 'mod', relpath: '../'};</script></div>
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autocomplete="off"
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placeholder="Click or press ‘S’ to search, ‘?’ for more options…"
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type="search">
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</form>
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</nav>
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Crate <a class="mod" href=''>memoffset</a></span><span class='out-of-band'><span id='render-detail'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../src/memoffset/lib.rs.html#21-70' title='goto source code'>[src]</a></span></h1>
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<div class='docblock'><p>A crate used for calculating offsets of struct members and their spans.</p>
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<p>Some of the funcationality of the crate makes no sense when used along with structs that
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are not <code>#[repr(C, packed)]</code>, but it is up to the user to make sure that they are.</p>
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<h2 id="examples" class="section-header"><a href="#examples">Examples</a></h2>
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<pre class="rust rust-example-rendered">
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<span class="attribute">#[<span class="ident">macro_use</span>]</span>
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">memoffset</span>;
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<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>, <span class="ident">packed</span>)]</span>
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<span class="kw">struct</span> <span class="ident">HelpMeIAmTrappedInAStructFactory</span> {
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<span class="ident">help_me_before_they_</span>: [<span class="ident">u8</span>; <span class="number">15</span>],
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<span class="ident">a</span>: <span class="ident">u32</span>
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}
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">offset_of</span><span class="macro">!</span>(<span class="ident">HelpMeIAmTrappedInAStructFactory</span>, <span class="ident">a</span>), <span class="number">15</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">span_of</span><span class="macro">!</span>(<span class="ident">HelpMeIAmTrappedInAStructFactory</span>, <span class="ident">a</span>), <span class="number">15</span>..<span class="number">19</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">span_of</span><span class="macro">!</span>(<span class="ident">HelpMeIAmTrappedInAStructFactory</span>, <span class="ident">help_me_before_they_</span>[<span class="number">2</span>] .. <span class="ident">a</span>), <span class="number">2</span>..<span class="number">15</span>);
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}</pre>
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<p>This functionality can be useful, for example, for checksum calculations:</p>
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<div class='information'><div class='tooltip ignore'>ⓘ<span class='tooltiptext'>This example is not tested</span></div></div><pre class="rust rust-example-rendered ignore">
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<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>, <span class="ident">packed</span>)]</span>
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<span class="kw">struct</span> <span class="ident">Message</span> {
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<span class="ident">header</span>: <span class="ident">MessageHeader</span>,
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<span class="ident">fragment_index</span>: <span class="ident">u32</span>,
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<span class="ident">fragment_count</span>: <span class="ident">u32</span>,
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<span class="ident">payload</span>: [<span class="ident">u8</span>; <span class="number">1024</span>],
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<span class="ident">checksum</span>: <span class="ident">u16</span>
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}
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<span class="kw">let</span> <span class="ident">checksum_range</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">raw</span>[<span class="macro">span_of</span><span class="macro">!</span>(<span class="ident">Message</span>, <span class="ident">header</span>..<span class="ident">checksum</span>)];
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<span class="kw">let</span> <span class="ident">checksum</span> <span class="op">=</span> <span class="ident">crc16</span>(<span class="ident">checksum_range</span>);</pre>
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</div><h2 id='macros' class='section-header'><a href="#macros">Macros</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="macro" href="macro.offset_of.html"
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title='macro memoffset::offset_of'>offset_of</a></td>
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<td class='docblock-short'>
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<p>Calculates the offset of the specified field from the start of the struct.
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This macro supports arbitrary amount of subscripts and recursive member-accesses.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="macro" href="macro.span_of.html"
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title='macro memoffset::span_of'>span_of</a></td>
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<td class='docblock-short'>
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<p>Produces a range instance representing the sub-slice containing the specified member.</p>
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</td>
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</tr></table></section>
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<section id='search' class="content hidden"></section>
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<aside id="help" class="hidden">
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<div>
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<h1 class="hidden">Help</h1>
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<div class="shortcuts">
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<h2>Keyboard Shortcuts</h2>
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<dl>
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<dt><kbd>?</kbd></dt>
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<dd>Show this help dialog</dd>
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<dd>Focus the search field</dd>
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</dl>
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</div>
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<div class="infos">
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<h2>Search Tricks</h2>
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<p>
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Prefix searches with a type followed by a colon (e.g.
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<code>fn:</code>) to restrict the search to a given type.
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</p>
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<p>
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Accepted types are: <code>fn</code>, <code>mod</code>,
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<code>struct</code>, <code>enum</code>,
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<code>trait</code>, <code>type</code>, <code>macro</code>,
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and <code>const</code>.
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</p>
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<p>
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Search functions by type signature (e.g.
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<code>vec -> usize</code> or <code>* -> vec</code>)
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</div>
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</div>
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</aside>
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<script>
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window.rootPath = "../";
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window.currentCrate = "memoffset";
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</script>
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<script src="../main.js"></script>
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<script defer src="../search-index.js"></script>
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</html>
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