| <!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/nix-0.26.2/src/macros.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>macros.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="../../nix/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="../../nix/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">// Thanks to Tokio for this macro |
| </span><span class="macro">macro_rules! </span>feature { |
| ( |
| <span class="attribute">#![<span class="macro-nonterminal">$meta</span>:meta] |
| </span>$(<span class="macro-nonterminal">$item</span>:item)* |
| ) => { |
| $( |
| <span class="attribute">#[cfg(<span class="macro-nonterminal">$meta</span>)] |
| #[cfg_attr(docsrs, doc(cfg(<span class="macro-nonterminal">$meta</span>)))] |
| </span><span class="macro-nonterminal">$item |
| </span>)* |
| } |
| } |
| |
| <span class="doccomment">/// The `libc_bitflags!` macro helps with a common use case of defining a public bitflags type |
| /// with values from the libc crate. It is used the same way as the `bitflags!` macro, except |
| /// that only the name of the flag value has to be given. |
| /// |
| /// The `libc` crate must be in scope with the name `libc`. |
| /// |
| /// # Example |
| /// ```ignore |
| /// libc_bitflags!{ |
| /// pub struct ProtFlags: libc::c_int { |
| /// PROT_NONE; |
| /// PROT_READ; |
| /// /// PROT_WRITE enables write protect |
| /// PROT_WRITE; |
| /// PROT_EXEC; |
| /// #[cfg(any(target_os = "linux", target_os = "android"))] |
| /// PROT_GROWSDOWN; |
| /// #[cfg(any(target_os = "linux", target_os = "android"))] |
| /// PROT_GROWSUP; |
| /// } |
| /// } |
| /// ``` |
| /// |
| /// Example with casting, due to a mistake in libc. In this example, the |
| /// various flags have different types, so we cast the broken ones to the right |
| /// type. |
| /// |
| /// ```ignore |
| /// libc_bitflags!{ |
| /// pub struct SaFlags: libc::c_ulong { |
| /// SA_NOCLDSTOP as libc::c_ulong; |
| /// SA_NOCLDWAIT; |
| /// SA_NODEFER as libc::c_ulong; |
| /// SA_ONSTACK; |
| /// SA_RESETHAND as libc::c_ulong; |
| /// SA_RESTART as libc::c_ulong; |
| /// SA_SIGINFO; |
| /// } |
| /// } |
| /// ``` |
| </span><span class="macro">macro_rules! </span>libc_bitflags { |
| ( |
| $(<span class="attribute">#[<span class="macro-nonterminal">$outer</span>:meta]</span>)* |
| <span class="kw">pub struct </span><span class="macro-nonterminal">$BitFlags</span>:ident: <span class="macro-nonterminal">$T</span>:ty { |
| $( |
| $(<span class="attribute">#[<span class="macro-nonterminal">$inner</span>:ident $(<span class="macro-nonterminal">$args</span>:tt)<span class="kw-2">*</span>]</span>)* |
| <span class="macro-nonterminal">$Flag</span>:ident $(<span class="kw">as </span><span class="macro-nonterminal">$cast</span>:ty)<span class="kw-2">*</span>; |
| )+ |
| } |
| ) => { |
| <span class="macro">::bitflags::bitflags! </span>{ |
| $(<span class="attribute">#[<span class="macro-nonterminal">$outer</span>]</span>)* |
| <span class="kw">pub struct </span><span class="macro-nonterminal">$BitFlags</span>: <span class="macro-nonterminal">$T </span>{ |
| $( |
| $(<span class="attribute">#[<span class="macro-nonterminal">$inner </span>$(<span class="macro-nonterminal">$args</span>)<span class="kw-2">*</span>]</span>)* |
| <span class="kw">const </span><span class="macro-nonterminal">$Flag </span>= libc::<span class="macro-nonterminal">$Flag </span>$(<span class="kw">as </span><span class="macro-nonterminal">$cast</span>)<span class="kw-2">*</span>; |
| )+ |
| } |
| } |
| }; |
| } |
| |
| <span class="doccomment">/// The `libc_enum!` macro helps with a common use case of defining an enum exclusively using |
| /// values from the `libc` crate. This macro supports both `pub` and private `enum`s. |
| /// |
| /// The `libc` crate must be in scope with the name `libc`. |
| /// |
| /// # Example |
| /// ```ignore |
| /// libc_enum!{ |
| /// pub enum ProtFlags { |
| /// PROT_NONE, |
| /// PROT_READ, |
| /// PROT_WRITE, |
| /// PROT_EXEC, |
| /// #[cfg(any(target_os = "linux", target_os = "android"))] |
| /// PROT_GROWSDOWN, |
| /// #[cfg(any(target_os = "linux", target_os = "android"))] |
| /// PROT_GROWSUP, |
| /// } |
| /// } |
| /// ``` |
| </span><span class="comment">// Some targets don't use all rules. |
| </span><span class="attribute">#[allow(unknown_lints)] |
| #[allow(unused_macro_rules)] |
| </span><span class="macro">macro_rules! </span>libc_enum { |
| <span class="comment">// Exit rule. |
| </span>(@make_enum |
| name: <span class="macro-nonterminal">$BitFlags</span>:ident, |
| { |
| <span class="macro-nonterminal">$v</span>:vis |
| attrs: [$(<span class="macro-nonterminal">$attrs</span>:tt)<span class="kw-2">*</span>], |
| entries: [$(<span class="macro-nonterminal">$entries</span>:tt)<span class="kw-2">*</span>], |
| } |
| ) => { |
| $(<span class="macro-nonterminal">$attrs</span>)* |
| <span class="attribute">#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)] |
| </span><span class="macro-nonterminal">$v </span><span class="kw">enum </span><span class="macro-nonterminal">$BitFlags </span>{ |
| $(<span class="macro-nonterminal">$entries</span>)* |
| } |
| }; |
| |
| <span class="comment">// Exit rule including TryFrom |
| </span>(@make_enum |
| name: <span class="macro-nonterminal">$BitFlags</span>:ident, |
| { |
| <span class="macro-nonterminal">$v</span>:vis |
| attrs: [$(<span class="macro-nonterminal">$attrs</span>:tt)<span class="kw-2">*</span>], |
| entries: [$(<span class="macro-nonterminal">$entries</span>:tt)<span class="kw-2">*</span>], |
| from_type: <span class="macro-nonterminal">$repr</span>:path, |
| try_froms: [$(<span class="macro-nonterminal">$try_froms</span>:tt)<span class="kw-2">*</span>] |
| } |
| ) => { |
| $(<span class="macro-nonterminal">$attrs</span>)* |
| <span class="attribute">#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)] |
| </span><span class="macro-nonterminal">$v </span><span class="kw">enum </span><span class="macro-nonterminal">$BitFlags </span>{ |
| $(<span class="macro-nonterminal">$entries</span>)* |
| } |
| <span class="kw">impl </span>::std::convert::TryFrom<<span class="macro-nonterminal">$repr</span>> <span class="kw">for </span><span class="macro-nonterminal">$BitFlags </span>{ |
| <span class="kw">type </span>Error = <span class="macro-nonterminal">$crate::Error</span>; |
| <span class="attribute">#[allow(unused_doc_comments)] |
| </span><span class="kw">fn </span>try_from(x: <span class="macro-nonterminal">$repr</span>) -> <span class="macro-nonterminal">$crate::Result</span><<span class="self">Self</span>> { |
| <span class="kw">match </span>x { |
| $(<span class="macro-nonterminal">$try_froms</span>)* |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(<span class="macro-nonterminal">$crate::Error::EINVAL</span>) |
| } |
| } |
| } |
| }; |
| |
| <span class="comment">// Done accumulating. |
| </span>(@accumulate_entries |
| name: <span class="macro-nonterminal">$BitFlags</span>:ident, |
| { |
| <span class="macro-nonterminal">$v</span>:vis |
| attrs: <span class="macro-nonterminal">$attrs</span>:tt, |
| }, |
| <span class="macro-nonterminal">$entries</span>:tt, |
| <span class="macro-nonterminal">$try_froms</span>:tt; |
| ) => { |
| <span class="macro">libc_enum! </span>{ |
| @make_enum |
| name: <span class="macro-nonterminal">$BitFlags</span>, |
| { |
| <span class="macro-nonterminal">$v |
| </span>attrs: <span class="macro-nonterminal">$attrs</span>, |
| entries: <span class="macro-nonterminal">$entries</span>, |
| } |
| } |
| }; |
| |
| <span class="comment">// Done accumulating and want TryFrom |
| </span>(@accumulate_entries |
| name: <span class="macro-nonterminal">$BitFlags</span>:ident, |
| { |
| <span class="macro-nonterminal">$v</span>:vis |
| attrs: <span class="macro-nonterminal">$attrs</span>:tt, |
| from_type: <span class="macro-nonterminal">$repr</span>:path, |
| }, |
| <span class="macro-nonterminal">$entries</span>:tt, |
| <span class="macro-nonterminal">$try_froms</span>:tt; |
| ) => { |
| <span class="macro">libc_enum! </span>{ |
| @make_enum |
| name: <span class="macro-nonterminal">$BitFlags</span>, |
| { |
| <span class="macro-nonterminal">$v |
| </span>attrs: <span class="macro-nonterminal">$attrs</span>, |
| entries: <span class="macro-nonterminal">$entries</span>, |
| from_type: <span class="macro-nonterminal">$repr</span>, |
| try_froms: <span class="macro-nonterminal">$try_froms |
| </span>} |
| } |
| }; |
| |
| <span class="comment">// Munch an attr. |
| </span>(@accumulate_entries |
| name: <span class="macro-nonterminal">$BitFlags</span>:ident, |
| <span class="macro-nonterminal">$prefix</span>:tt, |
| [$(<span class="macro-nonterminal">$entries</span>:tt)<span class="kw-2">*</span>], |
| [$(<span class="macro-nonterminal">$try_froms</span>:tt)<span class="kw-2">*</span>]; |
| <span class="attribute">#[<span class="macro-nonterminal">$attr</span>:meta] </span>$(<span class="macro-nonterminal">$tail</span>:tt)* |
| ) => { |
| <span class="macro">libc_enum! </span>{ |
| @accumulate_entries |
| name: <span class="macro-nonterminal">$BitFlags</span>, |
| <span class="macro-nonterminal">$prefix</span>, |
| [ |
| $(<span class="macro-nonterminal">$entries</span>)* |
| <span class="attribute">#[<span class="macro-nonterminal">$attr</span>] |
| </span>], |
| [ |
| $(<span class="macro-nonterminal">$try_froms</span>)* |
| <span class="attribute">#[<span class="macro-nonterminal">$attr</span>] |
| </span>]; |
| $(<span class="macro-nonterminal">$tail</span>)* |
| } |
| }; |
| |
| <span class="comment">// Munch last ident if not followed by a comma. |
| </span>(@accumulate_entries |
| name: <span class="macro-nonterminal">$BitFlags</span>:ident, |
| <span class="macro-nonterminal">$prefix</span>:tt, |
| [$(<span class="macro-nonterminal">$entries</span>:tt)<span class="kw-2">*</span>], |
| [$(<span class="macro-nonterminal">$try_froms</span>:tt)<span class="kw-2">*</span>]; |
| <span class="macro-nonterminal">$entry</span>:ident |
| ) => { |
| <span class="macro">libc_enum! </span>{ |
| @accumulate_entries |
| name: <span class="macro-nonterminal">$BitFlags</span>, |
| <span class="macro-nonterminal">$prefix</span>, |
| [ |
| $(<span class="macro-nonterminal">$entries</span>)* |
| <span class="macro-nonterminal">$entry </span>= libc::<span class="macro-nonterminal">$entry</span>, |
| ], |
| [ |
| $(<span class="macro-nonterminal">$try_froms</span>)* |
| libc::<span class="macro-nonterminal">$entry </span>=> <span class="prelude-val">Ok</span>(<span class="macro-nonterminal">$BitFlags</span>::<span class="macro-nonterminal">$entry</span>), |
| ]; |
| } |
| }; |
| |
| <span class="comment">// Munch an ident; covers terminating comma case. |
| </span>(@accumulate_entries |
| name: <span class="macro-nonterminal">$BitFlags</span>:ident, |
| <span class="macro-nonterminal">$prefix</span>:tt, |
| [$(<span class="macro-nonterminal">$entries</span>:tt)<span class="kw-2">*</span>], |
| [$(<span class="macro-nonterminal">$try_froms</span>:tt)<span class="kw-2">*</span>]; |
| <span class="macro-nonterminal">$entry</span>:ident, |
| $(<span class="macro-nonterminal">$tail</span>:tt)* |
| ) => { |
| <span class="macro">libc_enum! </span>{ |
| @accumulate_entries |
| name: <span class="macro-nonterminal">$BitFlags</span>, |
| <span class="macro-nonterminal">$prefix</span>, |
| [ |
| $(<span class="macro-nonterminal">$entries</span>)* |
| <span class="macro-nonterminal">$entry </span>= libc::<span class="macro-nonterminal">$entry</span>, |
| ], |
| [ |
| $(<span class="macro-nonterminal">$try_froms</span>)* |
| libc::<span class="macro-nonterminal">$entry </span>=> <span class="prelude-val">Ok</span>(<span class="macro-nonterminal">$BitFlags</span>::<span class="macro-nonterminal">$entry</span>), |
| ]; |
| $(<span class="macro-nonterminal">$tail</span>)* |
| } |
| }; |
| |
| <span class="comment">// Munch an ident and cast it to the given type; covers terminating comma. |
| </span>(@accumulate_entries |
| name: <span class="macro-nonterminal">$BitFlags</span>:ident, |
| <span class="macro-nonterminal">$prefix</span>:tt, |
| [$(<span class="macro-nonterminal">$entries</span>:tt)<span class="kw-2">*</span>], |
| [$(<span class="macro-nonterminal">$try_froms</span>:tt)<span class="kw-2">*</span>]; |
| <span class="macro-nonterminal">$entry</span>:ident <span class="kw">as </span><span class="macro-nonterminal">$ty</span>:ty, |
| $(<span class="macro-nonterminal">$tail</span>:tt)* |
| ) => { |
| <span class="macro">libc_enum! </span>{ |
| @accumulate_entries |
| name: <span class="macro-nonterminal">$BitFlags</span>, |
| <span class="macro-nonterminal">$prefix</span>, |
| [ |
| $(<span class="macro-nonterminal">$entries</span>)* |
| <span class="macro-nonterminal">$entry </span>= libc::<span class="macro-nonterminal">$entry </span><span class="kw">as </span><span class="macro-nonterminal">$ty</span>, |
| ], |
| [ |
| $(<span class="macro-nonterminal">$try_froms</span>)* |
| libc::<span class="macro-nonterminal">$entry </span><span class="kw">as </span><span class="macro-nonterminal">$ty </span>=> <span class="prelude-val">Ok</span>(<span class="macro-nonterminal">$BitFlags</span>::<span class="macro-nonterminal">$entry</span>), |
| ]; |
| $(<span class="macro-nonterminal">$tail</span>)* |
| } |
| }; |
| |
| <span class="comment">// Entry rule. |
| </span>( |
| $(<span class="attribute">#[<span class="macro-nonterminal">$attr</span>:meta]</span>)* |
| <span class="macro-nonterminal">$v</span>:vis <span class="kw">enum </span><span class="macro-nonterminal">$BitFlags</span>:ident { |
| $(<span class="macro-nonterminal">$vals</span>:tt)* |
| } |
| ) => { |
| <span class="macro">libc_enum! </span>{ |
| @accumulate_entries |
| name: <span class="macro-nonterminal">$BitFlags</span>, |
| { |
| <span class="macro-nonterminal">$v |
| </span>attrs: [$(<span class="attribute">#[<span class="macro-nonterminal">$attr</span>]</span>)<span class="kw-2">*</span>], |
| }, |
| [], |
| []; |
| $(<span class="macro-nonterminal">$vals</span>)* |
| } |
| }; |
| |
| <span class="comment">// Entry rule including TryFrom |
| </span>( |
| $(<span class="attribute">#[<span class="macro-nonterminal">$attr</span>:meta]</span>)* |
| <span class="macro-nonterminal">$v</span>:vis <span class="kw">enum </span><span class="macro-nonterminal">$BitFlags</span>:ident { |
| $(<span class="macro-nonterminal">$vals</span>:tt)* |
| } |
| <span class="kw">impl </span>TryFrom<<span class="macro-nonterminal">$repr</span>:path> |
| ) => { |
| <span class="macro">libc_enum! </span>{ |
| @accumulate_entries |
| name: <span class="macro-nonterminal">$BitFlags</span>, |
| { |
| <span class="macro-nonterminal">$v |
| </span>attrs: [$(<span class="attribute">#[<span class="macro-nonterminal">$attr</span>]</span>)<span class="kw-2">*</span>], |
| from_type: <span class="macro-nonterminal">$repr</span>, |
| }, |
| [], |
| []; |
| $(<span class="macro-nonterminal">$vals</span>)* |
| } |
| }; |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="nix" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |