| <!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 of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/aho-corasick-1.0.2/src/util/int.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>int.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../aho_corasick/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../aho_corasick/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="doccomment">/*! |
| This module provides several integer oriented traits for converting between |
| both fixed size integers and integers whose size varies based on the target |
| (like `usize`). |
| |
| The main design principle for this module is to centralize all uses of `as`. |
| The thinking here is that `as` makes it very easy to perform accidental lossy |
| conversions, and if we centralize all its uses here under more descriptive |
| higher level operations, its use and correctness becomes easier to audit. |
| |
| This was copied mostly wholesale from `regex-automata`. |
| |
| NOTE: for simplicity, we don't take target pointer width into account here for |
| `usize` conversions. Since we currently only panic in debug mode, skipping the |
| check when it can be proven it isn't needed at compile time doesn't really |
| matter. Now, if we wind up wanting to do as many checks as possible in release |
| mode, then we would want to skip those when we know the conversions are always |
| non-lossy. |
| */ |
| |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>U8 { |
| <span class="kw">fn </span>as_usize(<span class="self">self</span>) -> usize; |
| } |
| |
| <span class="kw">impl </span>U8 <span class="kw">for </span>u8 { |
| <span class="kw">fn </span>as_usize(<span class="self">self</span>) -> usize { |
| usize::from(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>U16 { |
| <span class="kw">fn </span>as_usize(<span class="self">self</span>) -> usize; |
| <span class="kw">fn </span>low_u8(<span class="self">self</span>) -> u8; |
| <span class="kw">fn </span>high_u8(<span class="self">self</span>) -> u8; |
| } |
| |
| <span class="kw">impl </span>U16 <span class="kw">for </span>u16 { |
| <span class="kw">fn </span>as_usize(<span class="self">self</span>) -> usize { |
| usize::from(<span class="self">self</span>) |
| } |
| |
| <span class="kw">fn </span>low_u8(<span class="self">self</span>) -> u8 { |
| <span class="self">self </span><span class="kw">as </span>u8 |
| } |
| |
| <span class="kw">fn </span>high_u8(<span class="self">self</span>) -> u8 { |
| (<span class="self">self </span>>> <span class="number">8</span>) <span class="kw">as </span>u8 |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>U32 { |
| <span class="kw">fn </span>as_usize(<span class="self">self</span>) -> usize; |
| <span class="kw">fn </span>low_u8(<span class="self">self</span>) -> u8; |
| <span class="kw">fn </span>low_u16(<span class="self">self</span>) -> u16; |
| <span class="kw">fn </span>high_u16(<span class="self">self</span>) -> u16; |
| } |
| |
| <span class="kw">impl </span>U32 <span class="kw">for </span>u32 { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>as_usize(<span class="self">self</span>) -> usize { |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span>{ |
| usize::try_from(<span class="self">self</span>).expect(<span class="string">"u32 overflowed usize"</span>) |
| } |
| <span class="attribute">#[cfg(not(debug_assertions))] |
| </span>{ |
| <span class="self">self </span><span class="kw">as </span>usize |
| } |
| } |
| |
| <span class="kw">fn </span>low_u8(<span class="self">self</span>) -> u8 { |
| <span class="self">self </span><span class="kw">as </span>u8 |
| } |
| |
| <span class="kw">fn </span>low_u16(<span class="self">self</span>) -> u16 { |
| <span class="self">self </span><span class="kw">as </span>u16 |
| } |
| |
| <span class="kw">fn </span>high_u16(<span class="self">self</span>) -> u16 { |
| (<span class="self">self </span>>> <span class="number">16</span>) <span class="kw">as </span>u16 |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>U64 { |
| <span class="kw">fn </span>as_usize(<span class="self">self</span>) -> usize; |
| <span class="kw">fn </span>low_u8(<span class="self">self</span>) -> u8; |
| <span class="kw">fn </span>low_u16(<span class="self">self</span>) -> u16; |
| <span class="kw">fn </span>low_u32(<span class="self">self</span>) -> u32; |
| <span class="kw">fn </span>high_u32(<span class="self">self</span>) -> u32; |
| } |
| |
| <span class="kw">impl </span>U64 <span class="kw">for </span>u64 { |
| <span class="kw">fn </span>as_usize(<span class="self">self</span>) -> usize { |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span>{ |
| usize::try_from(<span class="self">self</span>).expect(<span class="string">"u64 overflowed usize"</span>) |
| } |
| <span class="attribute">#[cfg(not(debug_assertions))] |
| </span>{ |
| <span class="self">self </span><span class="kw">as </span>usize |
| } |
| } |
| |
| <span class="kw">fn </span>low_u8(<span class="self">self</span>) -> u8 { |
| <span class="self">self </span><span class="kw">as </span>u8 |
| } |
| |
| <span class="kw">fn </span>low_u16(<span class="self">self</span>) -> u16 { |
| <span class="self">self </span><span class="kw">as </span>u16 |
| } |
| |
| <span class="kw">fn </span>low_u32(<span class="self">self</span>) -> u32 { |
| <span class="self">self </span><span class="kw">as </span>u32 |
| } |
| |
| <span class="kw">fn </span>high_u32(<span class="self">self</span>) -> u32 { |
| (<span class="self">self </span>>> <span class="number">32</span>) <span class="kw">as </span>u32 |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>I32 { |
| <span class="kw">fn </span>as_usize(<span class="self">self</span>) -> usize; |
| <span class="kw">fn </span>to_bits(<span class="self">self</span>) -> u32; |
| <span class="kw">fn </span>from_bits(n: u32) -> i32; |
| } |
| |
| <span class="kw">impl </span>I32 <span class="kw">for </span>i32 { |
| <span class="kw">fn </span>as_usize(<span class="self">self</span>) -> usize { |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span>{ |
| usize::try_from(<span class="self">self</span>).expect(<span class="string">"i32 overflowed usize"</span>) |
| } |
| <span class="attribute">#[cfg(not(debug_assertions))] |
| </span>{ |
| <span class="self">self </span><span class="kw">as </span>usize |
| } |
| } |
| |
| <span class="kw">fn </span>to_bits(<span class="self">self</span>) -> u32 { |
| <span class="self">self </span><span class="kw">as </span>u32 |
| } |
| |
| <span class="kw">fn </span>from_bits(n: u32) -> i32 { |
| n <span class="kw">as </span>i32 |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>Usize { |
| <span class="kw">fn </span>as_u8(<span class="self">self</span>) -> u8; |
| <span class="kw">fn </span>as_u16(<span class="self">self</span>) -> u16; |
| <span class="kw">fn </span>as_u32(<span class="self">self</span>) -> u32; |
| <span class="kw">fn </span>as_u64(<span class="self">self</span>) -> u64; |
| } |
| |
| <span class="kw">impl </span>Usize <span class="kw">for </span>usize { |
| <span class="kw">fn </span>as_u8(<span class="self">self</span>) -> u8 { |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span>{ |
| u8::try_from(<span class="self">self</span>).expect(<span class="string">"usize overflowed u8"</span>) |
| } |
| <span class="attribute">#[cfg(not(debug_assertions))] |
| </span>{ |
| <span class="self">self </span><span class="kw">as </span>u8 |
| } |
| } |
| |
| <span class="kw">fn </span>as_u16(<span class="self">self</span>) -> u16 { |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span>{ |
| u16::try_from(<span class="self">self</span>).expect(<span class="string">"usize overflowed u16"</span>) |
| } |
| <span class="attribute">#[cfg(not(debug_assertions))] |
| </span>{ |
| <span class="self">self </span><span class="kw">as </span>u16 |
| } |
| } |
| |
| <span class="kw">fn </span>as_u32(<span class="self">self</span>) -> u32 { |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span>{ |
| u32::try_from(<span class="self">self</span>).expect(<span class="string">"usize overflowed u32"</span>) |
| } |
| <span class="attribute">#[cfg(not(debug_assertions))] |
| </span>{ |
| <span class="self">self </span><span class="kw">as </span>u32 |
| } |
| } |
| |
| <span class="kw">fn </span>as_u64(<span class="self">self</span>) -> u64 { |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span>{ |
| u64::try_from(<span class="self">self</span>).expect(<span class="string">"usize overflowed u64"</span>) |
| } |
| <span class="attribute">#[cfg(not(debug_assertions))] |
| </span>{ |
| <span class="self">self </span><span class="kw">as </span>u64 |
| } |
| } |
| } |
| |
| <span class="comment">// Pointers aren't integers, but we convert pointers to integers to perform |
| // offset arithmetic in some places. (And no, we don't convert the integers |
| // back to pointers.) So add 'as_usize' conversions here too for completeness. |
| // |
| // These 'as' casts are actually okay because they're always non-lossy. But the |
| // idea here is to just try and remove as much 'as' as possible, particularly |
| // in this crate where we are being really paranoid about offsets and making |
| // sure we don't panic on inputs that might be untrusted. This way, the 'as' |
| // casts become easier to audit if they're all in one place, even when some of |
| // them are actually okay 100% of the time. |
| |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>Pointer { |
| <span class="kw">fn </span>as_usize(<span class="self">self</span>) -> usize; |
| } |
| |
| <span class="kw">impl</span><T> Pointer <span class="kw">for </span><span class="kw-2">*const </span>T { |
| <span class="kw">fn </span>as_usize(<span class="self">self</span>) -> usize { |
| <span class="self">self </span><span class="kw">as </span>usize |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>PointerMut { |
| <span class="kw">fn </span>as_usize(<span class="self">self</span>) -> usize; |
| } |
| |
| <span class="kw">impl</span><T> PointerMut <span class="kw">for </span><span class="kw-2">*mut </span>T { |
| <span class="kw">fn </span>as_usize(<span class="self">self</span>) -> usize { |
| <span class="self">self </span><span class="kw">as </span>usize |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="aho_corasick" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
