| <!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/foreign-types-0.3.2/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="../../foreign_types/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="../../foreign_types/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">//! A framework for Rust wrappers over C APIs. |
| //! |
| //! Ownership is as important in C as it is in Rust, but the semantics are often implicit. In |
| //! particular, pointer-to-value is commonly used to pass C values both when transferring ownership |
| //! or a borrow. |
| //! |
| //! This crate provides a framework to define a Rust wrapper over these kinds of raw C APIs in a way |
| //! that allows ownership semantics to be expressed in an ergonomic manner. The framework takes a |
| //! dual-type approach similar to APIs in the standard library such as `PathBuf`/`Path` or `String`/ |
| //! `str`. One type represents an owned value and references to the other represent borrowed |
| //! values. |
| //! |
| //! # Examples |
| //! |
| //! ``` |
| //! use foreign_types::{ForeignType, ForeignTypeRef, Opaque}; |
| //! use std::ops::{Deref, DerefMut}; |
| //! |
| //! mod foo_sys { |
| //! pub enum FOO {} |
| //! |
| //! extern { |
| //! pub fn FOO_free(foo: *mut FOO); |
| //! } |
| //! } |
| //! |
| //! // The borrowed type is a newtype wrapper around an `Opaque` value. |
| //! // |
| //! // `FooRef` values never exist; we instead create references to `FooRef`s |
| //! // from raw C pointers. |
| //! pub struct FooRef(Opaque); |
| //! |
| //! impl ForeignTypeRef for FooRef { |
| //! type CType = foo_sys::FOO; |
| //! } |
| //! |
| //! // The owned type is simply a newtype wrapper around the raw C type. |
| //! // |
| //! // It dereferences to `FooRef`, so methods that do not require ownership |
| //! // should be defined there. |
| //! pub struct Foo(*mut foo_sys::FOO); |
| //! |
| //! impl Drop for Foo { |
| //! fn drop(&mut self) { |
| //! unsafe { foo_sys::FOO_free(self.0) } |
| //! } |
| //! } |
| //! |
| //! impl ForeignType for Foo { |
| //! type CType = foo_sys::FOO; |
| //! type Ref = FooRef; |
| //! |
| //! unsafe fn from_ptr(ptr: *mut foo_sys::FOO) -> Foo { |
| //! Foo(ptr) |
| //! } |
| //! |
| //! fn as_ptr(&self) -> *mut foo_sys::FOO { |
| //! self.0 |
| //! } |
| //! } |
| //! |
| //! impl Deref for Foo { |
| //! type Target = FooRef; |
| //! |
| //! fn deref(&self) -> &FooRef { |
| //! unsafe { FooRef::from_ptr(self.0) } |
| //! } |
| //! } |
| //! |
| //! impl DerefMut for Foo { |
| //! fn deref_mut(&mut self) -> &mut FooRef { |
| //! unsafe { FooRef::from_ptr_mut(self.0) } |
| //! } |
| //! } |
| //! ``` |
| //! |
| //! The `foreign_type!` macro can generate this boilerplate for you: |
| //! |
| //! ``` |
| //! #[macro_use] |
| //! extern crate foreign_types; |
| //! |
| //! mod foo_sys { |
| //! pub enum FOO {} |
| //! |
| //! extern { |
| //! pub fn FOO_free(foo: *mut FOO); |
| //! pub fn FOO_duplicate(foo: *mut FOO) -> *mut FOO; // Optional |
| //! } |
| //! } |
| //! |
| //! foreign_type! { |
| //! type CType = foo_sys::FOO; |
| //! fn drop = foo_sys::FOO_free; |
| //! fn clone = foo_sys::FOO_duplicate; // Optional |
| //! /// A Foo. |
| //! pub struct Foo; |
| //! /// A borrowed Foo. |
| //! pub struct FooRef; |
| //! } |
| //! |
| //! # fn main() {} |
| //! ``` |
| //! |
| //! If `fn clone` is specified, then it must take `CType` as an argument and return a copy of it as `CType`. |
| //! It will be used to implement `ToOwned` and `Clone`. |
| //! |
| //! `#[derive(…)] is permitted before the lines with `pub struct`. |
| //! `#[doc(hidden)]` before the `type CType` line will hide the `foreign_type!` implementations from documentation. |
| //! |
| //! Say we then have a separate type in our C API that contains a `FOO`: |
| //! |
| //! ``` |
| //! mod foo_sys { |
| //! pub enum FOO {} |
| //! pub enum BAR {} |
| //! |
| //! extern { |
| //! pub fn FOO_free(foo: *mut FOO); |
| //! pub fn BAR_free(bar: *mut BAR); |
| //! pub fn BAR_get_foo(bar: *mut BAR) -> *mut FOO; |
| //! } |
| //! } |
| //! ``` |
| //! |
| //! The documentation for the C library states that `BAR_get_foo` returns a reference into the `BAR` |
| //! passed to it, which translates into a reference in Rust. It also says that we're allowed to |
| //! modify the `FOO`, so we'll define a pair of accessor methods, one immutable and one mutable: |
| //! |
| //! ``` |
| //! #[macro_use] |
| //! extern crate foreign_types; |
| //! |
| //! use foreign_types::ForeignTypeRef; |
| //! |
| //! mod foo_sys { |
| //! pub enum FOO {} |
| //! pub enum BAR {} |
| //! |
| //! extern { |
| //! pub fn FOO_free(foo: *mut FOO); |
| //! pub fn BAR_free(bar: *mut BAR); |
| //! pub fn BAR_get_foo(bar: *mut BAR) -> *mut FOO; |
| //! } |
| //! } |
| //! |
| //! foreign_type! { |
| //! #[doc(hidden)] |
| //! type CType = foo_sys::FOO; |
| //! fn drop = foo_sys::FOO_free; |
| //! /// A Foo. |
| //! pub struct Foo; |
| //! /// A borrowed Foo. |
| //! pub struct FooRef; |
| //! } |
| //! |
| //! foreign_type! { |
| //! type CType = foo_sys::BAR; |
| //! fn drop = foo_sys::BAR_free; |
| //! /// A Foo. |
| //! pub struct Bar; |
| //! /// A borrowed Bar. |
| //! pub struct BarRef; |
| //! } |
| //! |
| //! impl BarRef { |
| //! fn foo(&self) -> &FooRef { |
| //! unsafe { FooRef::from_ptr(foo_sys::BAR_get_foo(self.as_ptr())) } |
| //! } |
| //! |
| //! fn foo_mut(&mut self) -> &mut FooRef { |
| //! unsafe { FooRef::from_ptr_mut(foo_sys::BAR_get_foo(self.as_ptr())) } |
| //! } |
| //! } |
| //! |
| //! # fn main() {} |
| //! ``` |
| </span><span class="attribute">#![no_std] |
| #![warn(missing_docs)] |
| #![doc(html_root_url=<span class="string">"https://docs.rs/foreign-types/0.3"</span>)] |
| </span><span class="kw">extern crate </span>foreign_types_shared; |
| |
| <span class="attribute">#[doc(inline)] |
| </span><span class="kw">pub use </span>foreign_types_shared::<span class="kw-2">*</span>; |
| |
| <span class="doccomment">/// A macro to easily define wrappers for foreign types. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// #[macro_use] |
| /// extern crate foreign_types; |
| /// |
| /// # mod openssl_sys { pub type SSL = (); pub unsafe fn SSL_free(_: *mut SSL) {} pub unsafe fn SSL_dup(x: *mut SSL) -> *mut SSL {x} } |
| /// foreign_type! { |
| /// type CType = openssl_sys::SSL; |
| /// fn drop = openssl_sys::SSL_free; |
| /// fn clone = openssl_sys::SSL_dup; |
| /// /// Documentation for the owned type. |
| /// pub struct Ssl; |
| /// /// Documentation for the borrowed type. |
| /// pub struct SslRef; |
| /// } |
| /// |
| /// # fn main() {} |
| /// ``` |
| </span><span class="attribute">#[macro_export] |
| </span><span class="macro">macro_rules! </span>foreign_type { |
| ( |
| $(<span class="attribute">#[<span class="macro-nonterminal">$impl_attr</span>:meta]</span>)* |
| <span class="kw">type </span>CType = <span class="macro-nonterminal">$ctype</span>:ty; |
| <span class="kw">fn </span>drop = <span class="macro-nonterminal">$drop</span>:expr; |
| $(<span class="kw">fn </span>clone = <span class="macro-nonterminal">$clone</span>:expr;)* |
| $(<span class="attribute">#[<span class="macro-nonterminal">$owned_attr</span>:meta]</span>)* |
| <span class="kw">pub struct </span><span class="macro-nonterminal">$owned</span>:ident; |
| $(<span class="attribute">#[<span class="macro-nonterminal">$borrowed_attr</span>:meta]</span>)* |
| <span class="kw">pub struct </span><span class="macro-nonterminal">$borrowed</span>:ident; |
| ) => { |
| $(<span class="attribute">#[<span class="macro-nonterminal">$owned_attr</span>]</span>)* |
| <span class="kw">pub struct </span><span class="macro-nonterminal">$owned</span>(<span class="kw-2">*mut </span><span class="macro-nonterminal">$ctype</span>); |
| |
| $(<span class="attribute">#[<span class="macro-nonterminal">$impl_attr</span>]</span>)* |
| <span class="kw">impl </span><span class="macro-nonterminal">$crate::ForeignType </span><span class="kw">for </span><span class="macro-nonterminal">$owned </span>{ |
| <span class="kw">type </span>CType = <span class="macro-nonterminal">$ctype</span>; |
| <span class="kw">type </span>Ref = <span class="macro-nonterminal">$borrowed</span>; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">unsafe fn </span>from_ptr(ptr: <span class="kw-2">*mut </span><span class="macro-nonterminal">$ctype</span>) -> <span class="macro-nonterminal">$owned </span>{ |
| <span class="macro-nonterminal">$owned</span>(ptr) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>as_ptr(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">*mut </span><span class="macro-nonterminal">$ctype </span>{ |
| <span class="self">self</span>.<span class="number">0 |
| </span>} |
| } |
| |
| <span class="kw">impl </span>Drop <span class="kw">for </span><span class="macro-nonterminal">$owned </span>{ |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">unsafe </span>{ <span class="macro-nonterminal">$drop</span>(<span class="self">self</span>.<span class="number">0</span>) } |
| } |
| } |
| |
| $( |
| <span class="kw">impl </span>Clone <span class="kw">for </span><span class="macro-nonterminal">$owned </span>{ |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="macro-nonterminal">$owned </span>{ |
| <span class="kw">unsafe </span>{ |
| <span class="kw">let </span>handle: <span class="kw-2">*mut </span><span class="macro-nonterminal">$ctype </span>= <span class="macro-nonterminal">$clone</span>(<span class="self">self</span>.<span class="number">0</span>); |
| <span class="macro-nonterminal">$crate::ForeignType::from_ptr</span>(handle) |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>::std::borrow::ToOwned <span class="kw">for </span><span class="macro-nonterminal">$borrowed </span>{ |
| <span class="kw">type </span>Owned = <span class="macro-nonterminal">$owned</span>; |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>to_owned(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="macro-nonterminal">$owned </span>{ |
| <span class="kw">unsafe </span>{ |
| <span class="kw">let </span>handle: <span class="kw-2">*mut </span><span class="macro-nonterminal">$ctype </span>= <span class="macro-nonterminal">$clone</span>(<span class="macro-nonterminal">$crate::ForeignTypeRef::as_ptr</span>(<span class="self">self</span>)); |
| <span class="macro-nonterminal">$crate::ForeignType::from_ptr</span>(handle) |
| } |
| } |
| } |
| )* |
| |
| <span class="kw">impl </span>::std::ops::Deref <span class="kw">for </span><span class="macro-nonterminal">$owned </span>{ |
| <span class="kw">type </span>Target = <span class="macro-nonterminal">$borrowed</span>; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>deref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="macro-nonterminal">$borrowed </span>{ |
| <span class="kw">unsafe </span>{ <span class="macro-nonterminal">$crate::ForeignTypeRef::from_ptr</span>(<span class="self">self</span>.<span class="number">0</span>) } |
| } |
| } |
| |
| <span class="kw">impl </span>::std::ops::DerefMut <span class="kw">for </span><span class="macro-nonterminal">$owned </span>{ |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>deref_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span><span class="macro-nonterminal">$borrowed </span>{ |
| <span class="kw">unsafe </span>{ <span class="macro-nonterminal">$crate::ForeignTypeRef::from_ptr_mut</span>(<span class="self">self</span>.<span class="number">0</span>) } |
| } |
| } |
| |
| <span class="kw">impl </span>::std::borrow::Borrow<<span class="macro-nonterminal">$borrowed</span>> <span class="kw">for </span><span class="macro-nonterminal">$owned </span>{ |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>borrow(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="macro-nonterminal">$borrowed </span>{ |
| <span class="kw-2">&**</span><span class="self">self |
| </span>} |
| } |
| |
| <span class="kw">impl </span>::std::convert::AsRef<<span class="macro-nonterminal">$borrowed</span>> <span class="kw">for </span><span class="macro-nonterminal">$owned </span>{ |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="macro-nonterminal">$borrowed </span>{ |
| <span class="kw-2">&**</span><span class="self">self |
| </span>} |
| } |
| |
| $(<span class="attribute">#[<span class="macro-nonterminal">$borrowed_attr</span>]</span>)* |
| <span class="kw">pub struct </span><span class="macro-nonterminal">$borrowed</span>(<span class="macro-nonterminal">$crate::Opaque</span>); |
| |
| $(<span class="attribute">#[<span class="macro-nonterminal">$impl_attr</span>]</span>)* |
| <span class="kw">impl </span><span class="macro-nonterminal">$crate::ForeignTypeRef </span><span class="kw">for </span><span class="macro-nonterminal">$borrowed </span>{ |
| <span class="kw">type </span>CType = <span class="macro-nonterminal">$ctype</span>; |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="foreign_types" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
