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 <!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/inventory-0.1.11/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.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="../../inventory/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="../../inventory/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">//! [![github]](https://github.com/dtolnay/inventory)&amp;ensp;[![crates-io]](https://crates.io/crates/inventory)&amp;ensp;[![docs-rs]](https://docs.rs/inventory)
 //!
 //! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&amp;labelColor=555555&amp;logo=github
 //! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&amp;labelColor=555555&amp;logo=rust
 //! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&amp;labelColor=555555&amp;logoColor=white&amp;logo=data:image/svg+xml;base64,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
 //!
 //! &lt;br&gt;
 //!
 //! **Typed distributed plugin registration.**
 //!
 //! This crate provides a way to set up a plugin registry into which plugins
 //! can be registered from any source file linked into your application. There
 //! does not need to be a central list of all the plugins.
 //!
 //! # Examples
 //!
 //! Suppose we are writing a command line flags library and want to allow any
 //! source file in the application to register command line flags that are
 //! relevant to it.
 //!
 //! This is the flag registration style used by [gflags] and is better suited
 //! for large scale development than maintaining a single central list of flags,
 //! as the central list would become an endless source of merge conflicts in an
 //! application developed simultaneously by thousands of developers.
 //!
 //! [gflags]: https://gflags.github.io/gflags/
 //!
 //! ## Instantiating the plugin registry
 //!
 //! Let&#39;s use a `struct Flag` as the plugin type, which will contain the short
 //! name of the flag like `-v`, the full name like `--verbose`, and maybe other
 //! information like argument type and help text. We instantiate a plugin
 //! registry with an invocation of `inventory::collect!`.
 //!
 //! ```
 //! pub struct Flag {
 //!     short: char,
 //!     name: &amp;&#39;static str,
 //!     /* ... */
 //! }
 //!
 //! impl Flag {
 //!     pub fn new(short: char, name: &amp;&#39;static str) -&gt; Self {
 //!         Flag { short, name }
 //!     }
 //! }
 //!
 //! inventory::collect!(Flag);
 //! ```
 //!
 //! This `collect!` call must be in the same crate that defines the plugin type.
 //! This macro does not &quot;run&quot; anything so place it outside of any function body.
 //!
 //! ## Registering plugins
 //!
 //! Now any crate with access to the `Flag` type can register flags as a plugin.
 //! Plugins can be registered by the same crate that declares the plugin type,
 //! or by any downstream crate.
 //!
 //! ```
 //! # struct Flag;
 //! #
 //! # impl Flag {
 //! #     fn new(short: char, name: &amp;&#39;static str) -&gt; Self {
 //! #         Flag
 //! #     }
 //! # }
 //! #
 //! # inventory::collect!(Flag);
 //! #
 //! inventory::submit! {
 //!     Flag::new(&#39;v&#39;, &quot;verbose&quot;)
 //! }
 //! #
 //! # fn main() {}
 //! ```
 //!
 //! The `submit!` macro does not &quot;run&quot; anything so place it outside of any
 //! function body. In particular, note that all `submit!` invocations across all
 //! source files linked into your application all take effect simultaneously. A
 //! `submit!` invocation is not a statement that needs to be called from `main`
 //! in order to execute.
 //!
 //! ## Iterating over plugins
 //!
 //! The value `inventory::iter::&lt;T&gt;` is an iterator with element type `&amp;&#39;static
 //! T` that iterates over all plugins registered of type `T`.
 //!
 //! ```
 //! # struct Flag {
 //! #     short: char,
 //! #     name: &amp;&#39;static str,
 //! # }
 //! #
 //! # inventory::collect!(Flag);
 //! #
 //! for flag in inventory::iter::&lt;Flag&gt; {
 //!     println!(&quot;-{}, --{}&quot;, flag.short, flag.name);
 //! }
 //! ```
 //!
 //! There is no guarantee about the order that plugins of the same type are
 //! visited by the iterator. They may be visited in any order.

 </span><span class="attribute">#![doc(html_root_url = <span class="string">&quot;https://docs.rs/inventory/0.1.11&quot;</span>)]
 #![cfg_attr(not(inventory_require_std), no_std)]
 #![allow(
     clippy::doc_markdown,
     clippy::empty_enum,
     clippy::expl_impl_clone_on_copy,
     clippy::let_unit_value,
     clippy::must_use_candidate,
     clippy::semicolon_if_nothing_returned, <span class="comment">// https://github.com/rust-lang/rust-clippy/issues/7324
 </span>)]

 #[cfg(not(inventory_require_std))]
 </span><span class="kw">extern crate </span>alloc;
 <span class="attribute">#[cfg(not(inventory_require_std))]
 </span><span class="kw">use </span>alloc::boxed::Box;

 <span class="comment">// Not public API.
 </span><span class="attribute">#[doc(hidden)]
 </span><span class="kw">pub use </span>ctor::ctor;

 <span class="comment">// Not public API.
 </span><span class="attribute">#[doc(hidden)]
 </span><span class="kw">pub use </span>inventory_impl <span class="kw">as </span>r#impl;

 <span class="kw">use </span>core::ops::Deref;
 <span class="kw">use </span>core::ptr;
 <span class="kw">use </span>core::sync::atomic::{AtomicPtr, Ordering};

 <span class="comment">// Not public API. Used by generated code.
 </span><span class="attribute">#[doc(hidden)]
 </span><span class="kw">pub struct </span>Registry&lt;T: <span class="lifetime">&#39;static</span>&gt; {
     head: AtomicPtr&lt;Node&lt;T&gt;&gt;,
 }

 <span class="kw">struct </span>Node&lt;T: <span class="lifetime">&#39;static</span>&gt; {
     value: T,
     next: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>Node&lt;T&gt;&gt;,
 }

 <span class="doccomment">/// Trait bound corresponding to types that can be iterated by inventory::iter.
 ///
 /// This trait cannot be implemented manually. Instead use the [`collect`] macro
 /// which expands to an implementation of this trait for the given type.
 ///
 /// # Examples
 ///
 /// ```
 /// use inventory::Collect;
 ///
 /// fn count_plugins&lt;T: Collect&gt;() -&gt; usize {
 ///     inventory::iter::&lt;T&gt;.into_iter().count()
 /// }
 /// ```
 </span><span class="kw">pub trait </span>Collect: Sized + <span class="lifetime">&#39;static </span>{
     <span class="attribute">#[doc(hidden)]
     </span><span class="kw">fn </span>registry() -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>Registry&lt;<span class="self">Self</span>&gt;;
 }

 <span class="comment">// Not public API. Used by generated code.
 </span><span class="attribute">#[doc(hidden)]
 </span><span class="kw">pub fn </span>submit&lt;T: Collect&gt;(value: T) {
     <span class="comment">// TODO: Avoid allocation by storing node in a static mut Option&lt;Node&lt;T&gt;&gt;
     // after existential type is stable. See comment in inventory-impl.
     </span>T::registry().submit(Box::new(Node { value, next: <span class="prelude-val">None </span>}));
 }

 <span class="kw">impl</span>&lt;T: <span class="lifetime">&#39;static</span>&gt; Registry&lt;T&gt; {
     <span class="comment">// Not public API. Used by generated code.
     </span><span class="kw">pub const fn </span>new() -&gt; <span class="self">Self </span>{
         Registry {
             head: AtomicPtr::new(ptr::null_mut()),
         }
     }

     <span class="kw">fn </span>submit(<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span><span class="self">self</span>, new: Box&lt;Node&lt;T&gt;&gt;) {
         <span class="kw">let </span><span class="kw-2">mut </span>new = ptr::NonNull::from(Box::leak(new));
         <span class="kw">let </span><span class="kw-2">mut </span>head = <span class="self">self</span>.head.load(Ordering::SeqCst);
         <span class="kw">loop </span>{
             <span class="comment">// `new` is always a valid Node&lt;T&gt;, and is not yet visible through the registry.
             // `head` is always null or valid &amp;&#39;static Node&lt;T&gt;.
             </span><span class="kw">unsafe </span>{ new.as_mut().next = head.as_ref() };
             <span class="kw">match </span><span class="self">self
                 </span>.head
                 .compare_exchange(head, new.as_ptr(), Ordering::SeqCst, Ordering::SeqCst)
             {
                 <span class="prelude-val">Ok</span>(<span class="kw">_</span>) =&gt; <span class="kw">return</span>,
                 <span class="prelude-val">Err</span>(prev) =&gt; head = prev,
             }
         }
     }
 }

 <span class="attribute">#[allow(non_camel_case_types)]
 </span><span class="kw">mod </span>private {
     <span class="kw">use </span>ghost::phantom;

     <span class="attribute">#[phantom]
     </span><span class="kw">pub struct </span>iter&lt;T&gt;;
 }

 <span class="doccomment">/// An iterator over plugins registered of a given type.
 ///
 /// The value `inventory::iter::&lt;T&gt;` is an iterator with element type `&amp;&#39;static
 /// T`.
 ///
 /// There is no guarantee about the order that plugins of the same type are
 /// visited by the iterator. They may be visited in any order.
 ///
 /// # Examples
 ///
 /// ```
 /// # struct Flag {
 /// #     short: char,
 /// #     name: &amp;&#39;static str,
 /// # }
 /// #
 /// # inventory::collect!(Flag);
 /// #
 /// # const IGNORE: &amp;str = stringify! {
 /// use my_flags::Flag;
 /// # };
 ///
 /// fn main() {
 ///     for flag in inventory::iter::&lt;Flag&gt; {
 ///         println!(&quot;-{}, --{}&quot;, flag.short, flag.name);
 ///     }
 /// }
 /// ```
 ///
 /// Refer to the [crate level documentation](index.html) for a complete example
 /// of instantiating a plugin registry and submitting plugins.
 </span><span class="attribute">#[allow(non_camel_case_types)]
 </span><span class="kw">pub type </span>iter&lt;T&gt; = private::iter&lt;T&gt;;

 <span class="attribute">#[doc(hidden)]
 </span><span class="kw">pub use </span><span class="kw">crate</span>::private::<span class="kw-2">*</span>;

 <span class="kw">const </span>ITER: () = {
     <span class="kw">fn </span>into_iter&lt;T: Collect&gt;() -&gt; Iter&lt;T&gt; {
         <span class="kw">let </span>head = T::registry().head.load(Ordering::SeqCst);
         Iter {
             <span class="comment">// Head pointer is always null or valid &amp;&#39;static Node&lt;T&gt;.
             </span>node: <span class="kw">unsafe </span>{ head.as_ref() },
         }
     }

     <span class="kw">impl</span>&lt;T: Collect&gt; IntoIterator <span class="kw">for </span>iter&lt;T&gt; {
         <span class="kw">type </span>Item = <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>T;
         <span class="kw">type </span>IntoIter = Iter&lt;T&gt;;

         <span class="kw">fn </span>into_iter(<span class="self">self</span>) -&gt; <span class="self">Self</span>::IntoIter {
             into_iter()
         }
     }

     <span class="attribute">#[doc(hidden)]
     </span><span class="kw">impl</span>&lt;T: Collect&gt; Deref <span class="kw">for </span>iter&lt;T&gt; {
         <span class="kw">type </span>Target = <span class="kw">fn</span>() -&gt; Iter&lt;T&gt;;
         <span class="kw">fn </span>deref(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="self">Self</span>::Target {
             <span class="kw-2">&amp;</span>(into_iter <span class="kw">as fn</span>() -&gt; Iter&lt;T&gt;)
         }
     }

     <span class="attribute">#[derive(Clone)]
     </span><span class="kw">pub struct </span>Iter&lt;T: <span class="lifetime">&#39;static</span>&gt; {
         node: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>Node&lt;T&gt;&gt;,
     }

     <span class="kw">impl</span>&lt;T: <span class="lifetime">&#39;static</span>&gt; Iterator <span class="kw">for </span>Iter&lt;T&gt; {
         <span class="kw">type </span>Item = <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>T;

         <span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt; {
             <span class="kw">let </span>node = <span class="self">self</span>.node<span class="question-mark">?</span>;
             <span class="kw">let </span>value = <span class="kw-2">&amp;</span>node.value;
             <span class="self">self</span>.node = node.next;
             <span class="prelude-val">Some</span>(value)
         }
     }
 };

 <span class="doccomment">/// Associate a plugin registry with the specified type.
 ///
 /// This call must be in the same crate that defines the plugin type. This macro
 /// does not &quot;run&quot; anything so place it outside of any function body.
 ///
 /// # Examples
 ///
 /// Suppose we are writing a command line flags library and want to allow any
 /// source file in the application to register command line flags that are
 /// relevant to it.
 ///
 /// This is the flag registration style used by [gflags] and is better suited
 /// for large scale development than maintaining a single central list of flags,
 /// as the central list would become an endless source of merge conflicts.
 ///
 /// [gflags]: https://gflags.github.io/gflags/
 ///
 /// ```
 /// pub struct Flag {
 ///     short: char,
 ///     name: &amp;&#39;static str,
 ///     /* ... */
 /// }
 ///
 /// inventory::collect!(Flag);
 /// ```
 ///
 /// Refer to the [crate level documentation](index.html) for a complete example
 /// of submitting plugins and iterating a plugin registry.
 </span><span class="attribute">#[macro_export]
 </span><span class="macro">macro_rules! </span>collect {
     (<span class="macro-nonterminal">$ty</span>:ty) =&gt; {
         <span class="kw">impl </span><span class="macro-nonterminal">$crate::Collect </span><span class="kw">for </span><span class="macro-nonterminal">$ty </span>{
             <span class="attribute">#[inline]
             </span><span class="kw">fn </span>registry() -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span><span class="macro-nonterminal">$crate::Registry</span>&lt;<span class="self">Self</span>&gt; {
                 <span class="kw">static </span>REGISTRY: <span class="macro-nonterminal">$crate::Registry</span>&lt;<span class="macro-nonterminal">$ty</span>&gt; = <span class="macro-nonterminal">$crate::Registry::new</span>();
                 <span class="kw-2">&amp;</span>REGISTRY
             }
         }
     };
 }

 <span class="doccomment">/// Enter an element into the plugin registry corresponding to its type.
 ///
 /// This call may be in the same crate that defines the type, or downstream in
 /// any crate that depends on that crate.
 ///
 /// This macro does not &quot;run&quot; anything so place it outside of any function body.
 /// In particular, note that all `submit!` invocations across all source files
 /// linked into your application all take effect simultaneously. A `submit!`
 /// invocation is not a statement that needs to be called from `main` in order
 /// to execute.
 ///
 /// # Examples
 ///
 /// Put `submit!` invocations outside of any function body.
 ///
 /// ```
 /// # struct Flag;
 /// #
 /// # impl Flag {
 /// #     fn new(short: char, name: &amp;&#39;static str) -&gt; Self {
 /// #         Flag
 /// #     }
 /// # }
 /// #
 /// # inventory::collect!(Flag);
 /// #
 /// inventory::submit! {
 ///     Flag::new(&#39;v&#39;, &quot;verbose&quot;)
 /// }
 /// #
 /// # fn main() {}
 /// ```
 ///
 /// Do not try to invoke `submit!` from inside of a function body as it does not
 /// do what you want.
 ///
 /// ```compile_fail
 /// // Do not do this.
 /// fn submit_flags(has_verbose_flag: bool) {
 ///     if has_verbose_flag {
 ///         inventory::submit! {
 ///             Flag::new(&#39;v&#39;, &quot;verbose&quot;)
 ///         }
 ///     }
 /// }
 /// ```
 ///
 /// Refer to the [crate level documentation](index.html) for a complete example
 /// of instantiating and iterating a plugin registry.
 </span><span class="attribute">#[macro_export]
 </span><span class="macro">macro_rules! </span>submit {
     ($(<span class="macro-nonterminal">$value</span>:tt)<span class="kw-2">*</span>) =&gt; {
         <span class="macro-nonterminal">$</span><span class="kw">crate</span>::r#impl<span class="macro">::submit! </span>{
             $(<span class="macro-nonterminal">$value</span>)*
         }
     }
 }

 <span class="attribute">#[allow(dead_code)]
 </span><span class="kw">fn </span>unused() {
     <span class="kw">let _ </span>= ITER;
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="inventory" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>