| <!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/value-bag-1.4.0/src/internal/cast/primitive.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>primitive.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="../../../../value_bag/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="../../../../value_bag/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="comment">/* |
| This module generates code to try efficiently convert some arbitrary `T: 'static` into |
| a `Internal`. |
| */ |
| |
| </span><span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::std::string::String; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::internal::Internal; |
| |
| <span class="kw">pub</span>(<span class="kw">in </span><span class="kw">crate</span>::internal) <span class="kw">fn </span>from_any<<span class="lifetime">'v</span>, T: <span class="question-mark">?</span>Sized + <span class="lifetime">'static</span>>(value: <span class="kw-2">&</span><span class="lifetime">'v </span>T) -> <span class="prelude-ty">Option</span><Internal<<span class="lifetime">'v</span>>> { |
| <span class="comment">// NOTE: The casts for unsized values (str) are dubious here. To really do this properly |
| // we need https://github.com/rust-lang/rust/issues/81513 |
| // NOTE: With some kind of const `Any::is<T>` we could do all this at compile-time |
| // Older versions of `value-bag` did this, but the infrastructure just wasn't worth |
| // the tiny performance improvement |
| </span><span class="kw">use </span><span class="kw">crate</span>::std::any::TypeId; |
| |
| <span class="kw">enum </span>Void {} |
| |
| <span class="attribute">#[repr(transparent)] |
| </span><span class="kw">struct </span>VoidRef<<span class="lifetime">'a</span>>(<span class="kw-2">*const &</span><span class="lifetime">'a </span>Void); |
| |
| <span class="macro">macro_rules! </span>type_ids { |
| ($( |
| $(<span class="attribute">#[cfg($(<span class="macro-nonterminal">$cfg</span>:tt)<span class="kw-2">*</span>)]</span>)* |
| <span class="macro-nonterminal">$ty</span>:ty, |
| )<span class="kw-2">*</span>) => { |
| |v: VoidRef<<span class="lifetime">'_</span>>| { |
| <span class="kw">if </span>TypeId::of::<T>() == TypeId::of::<str>() { |
| <span class="comment">// SAFETY: We verify the value is str before casting |
| </span><span class="kw">let </span>v = <span class="kw">unsafe </span>{ <span class="kw-2">*</span>(v.<span class="number">0 </span><span class="kw">as </span><span class="kw-2">*const &</span><span class="lifetime">'_ </span>str) }; |
| |
| <span class="kw">return </span><span class="prelude-val">Some</span>(Internal::from(v)); |
| } |
| |
| $( |
| $(<span class="attribute">#[cfg($(<span class="macro-nonterminal">$cfg</span>)<span class="kw-2">*</span>)]</span>)* |
| <span class="kw">if </span>TypeId::of::<T>() == TypeId::of::<<span class="macro-nonterminal">$ty</span>>() { |
| <span class="comment">// SAFETY: We verify the value is $ty before casting |
| </span><span class="kw">let </span>v = <span class="kw">unsafe </span>{ <span class="kw-2">*</span>(v.<span class="number">0 </span><span class="kw">as </span><span class="kw-2">*const &</span><span class="lifetime">'_ </span><span class="macro-nonterminal">$ty</span>) }; |
| |
| <span class="kw">return </span><span class="prelude-val">Some</span>(Internal::from(v)); |
| } |
| )* |
| $( |
| $(<span class="attribute">#[cfg($(<span class="macro-nonterminal">$cfg</span>)<span class="kw-2">*</span>)]</span>)* |
| <span class="kw">if </span>TypeId::of::<T>() == TypeId::of::<<span class="prelude-ty">Option</span><<span class="macro-nonterminal">$ty</span>>>() { |
| <span class="comment">// SAFETY: We verify the value is Option<$ty> before casting |
| </span><span class="kw">let </span>v = <span class="kw">unsafe </span>{ <span class="kw-2">*</span>(v.<span class="number">0 </span><span class="kw">as </span><span class="kw-2">*const &</span><span class="lifetime">'_ </span><span class="prelude-ty">Option</span><<span class="macro-nonterminal">$ty</span>>) }; |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(v) = v { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(Internal::from(v)); |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Some</span>(Internal::None); |
| } |
| } |
| )* |
| |
| <span class="prelude-val">None |
| </span>} |
| }; |
| } |
| |
| <span class="kw">let </span>type_ids = <span class="macro">type_ids!</span>[ |
| usize, |
| u8, |
| u16, |
| u32, |
| u64, |
| u128, |
| isize, |
| i8, |
| i16, |
| i32, |
| i64, |
| i128, |
| f32, |
| f64, |
| char, |
| bool, |
| <span class="kw-2">&</span><span class="lifetime">'static </span>str, |
| <span class="comment">// We deal with `str` separately because it's unsized |
| // str, |
| </span><span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span>String, |
| ]; |
| |
| (type_ids)(VoidRef(<span class="kw-2">&</span>(value) <span class="kw">as </span><span class="kw-2">*const &</span><span class="lifetime">'v </span>T <span class="kw">as </span><span class="kw-2">*const &</span><span class="lifetime">'v </span>Void)) |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="value_bag" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |