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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 `/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/rawpointer-0.2.1/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs - source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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</pre><div class="example-wrap"><pre class="rust ">
<span class="comment">// Copyright 2016-2019 bluss and rawpointer developers.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="attribute">#![<span class="ident">no_std</span>]</span>
<span class="doccomment">//! Rawpointer adds extra utility methods to raw pointers `*const T`, `*mut T`</span>
<span class="doccomment">//! and `NonNull<T>`.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Features include:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! - Strided offsets - [`.stride_offset(stride,</span>
<span class="doccomment">//! index)`](PointerExt::stride_offset) make it easy to compute</span>
<span class="doccomment">//! pointer offsets where the index is unsigned and the stride is signed.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! - Offsetting methods in general for `NonNull`, since it does not have these</span>
<span class="doccomment">//! from libcore</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! - Post- and preincrement and post- and predecrement methods</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! - For `p++` use [`p.post_inc()`](PointerExt::post_inc).</span>
<span class="doccomment">//! - For `++p` use [`p.pre_inc()`](PointerExt::pre_inc).</span>
<span class="doccomment">//! - For `p--` use [`p.post_dec()`](PointerExt::post_dec).</span>
<span class="doccomment">//! - For `--p` use [`p.pre_dec()`](PointerExt::pre_dec).</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! use rawpointer::PointerExt;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! unsafe {</span>
<span class="doccomment">//! // In this example:</span>
<span class="doccomment">//! // Use .post_inc() to iterate and overwrite the first four</span>
<span class="doccomment">//! // elements of the array.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let mut xs = [0; 16];</span>
<span class="doccomment">//! let mut ptr = xs.as_mut_ptr();</span>
<span class="doccomment">//! let end = ptr.offset(4);</span>
<span class="doccomment">//! let mut i = 0;</span>
<span class="doccomment">//! while ptr != end {</span>
<span class="doccomment">//! *ptr.post_inc() = i;</span>
<span class="doccomment">//! i += 1;</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! assert_eq!(&xs[..8], &[0, 1, 2, 3, 0, 0, 0, 0]);</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Safety</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! See the Rust [core::ptr] documentation for more information.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Rust Version</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This version of the crate requires Rust 1.26 or later</span>
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">mem</span>::<span class="ident">size_of</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ptr</span>::<span class="ident">NonNull</span>;
<span class="doccomment">/// Return the number of elements of `T` from `start` to `end`.<br></span>
<span class="doccomment">/// Return the arithmetic difference if `T` is zero size.</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ptrdistance</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">start</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">end</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="kw">let</span> <span class="ident">size</span> <span class="op">=</span> <span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>();
<span class="kw">if</span> <span class="ident">size</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
(<span class="ident">end</span> <span class="kw">as</span> <span class="ident">usize</span>).<span class="ident">wrapping_sub</span>(<span class="ident">start</span> <span class="kw">as</span> <span class="ident">usize</span>)
} <span class="kw">else</span> {
(<span class="ident">end</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">-</span> <span class="ident">start</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op">/</span> <span class="ident">size</span>
}
}
<span class="doccomment">/// Extension methods for raw pointers</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">PointerExt</span> : <span class="ident">Copy</span> {
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">offset</span>(<span class="self">self</span>, <span class="ident">i</span>: <span class="ident">isize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>;
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">add</span>(<span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">self</span>.<span class="ident">offset</span>(<span class="ident">i</span> <span class="kw">as</span> <span class="ident">isize</span>)
}
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">sub</span>(<span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">self</span>.<span class="ident">offset</span>((<span class="ident">i</span> <span class="kw">as</span> <span class="ident">isize</span>).<span class="ident">wrapping_neg</span>())
}
<span class="doccomment">/// Increment the pointer by 1, and return its new value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Equivalent to the C idiom `++ptr`.</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">pre_inc</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">offset</span>(<span class="number">1</span>);
<span class="kw-2">*</span><span class="self">self</span>
}
<span class="doccomment">/// Increment the pointer by 1, but return its old value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Equivalent to the C idiom `ptr++`.</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">post_inc</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="kw">let</span> <span class="ident">current</span> <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span>;
<span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">offset</span>(<span class="number">1</span>);
<span class="ident">current</span>
}
<span class="doccomment">/// Decrement the pointer by 1, and return its new value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Equivalent to the C idiom `--ptr`.</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">pre_dec</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">offset</span>(<span class="op">-</span><span class="number">1</span>);
<span class="kw-2">*</span><span class="self">self</span>
}
<span class="doccomment">/// Decrement the pointer by 1, but return its old value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Equivalent to the C idiom `ptr--`.</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">post_dec</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="kw">let</span> <span class="ident">current</span> <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span>;
<span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">offset</span>(<span class="op">-</span><span class="number">1</span>);
<span class="ident">current</span>
}
<span class="doccomment">/// Increment by 1</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">inc</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">offset</span>(<span class="number">1</span>);
}
<span class="doccomment">/// Decrement by 1</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">dec</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">offset</span>(<span class="op">-</span><span class="number">1</span>);
}
<span class="doccomment">/// Offset the pointer by `s` multiplied by `index`.</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">stride_offset</span>(<span class="self">self</span>, <span class="ident">s</span>: <span class="ident">isize</span>, <span class="ident">index</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">self</span>.<span class="ident">offset</span>(<span class="ident">s</span> <span class="op">*</span> <span class="ident">index</span> <span class="kw">as</span> <span class="ident">isize</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">PointerExt</span> <span class="kw">for</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span> {
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">offset</span>(<span class="self">self</span>, <span class="ident">i</span>: <span class="ident">isize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">self</span>.<span class="ident">offset</span>(<span class="ident">i</span>)
}
<span class="comment">// Call inherent version of add/sub</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">add</span>(<span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">self</span>.<span class="ident">add</span>(<span class="ident">i</span>)
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">sub</span>(<span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">self</span>.<span class="ident">sub</span>(<span class="ident">i</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">PointerExt</span> <span class="kw">for</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">offset</span>(<span class="self">self</span>, <span class="ident">i</span>: <span class="ident">isize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">self</span>.<span class="ident">offset</span>(<span class="ident">i</span>)
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">add</span>(<span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">self</span>.<span class="ident">add</span>(<span class="ident">i</span>)
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">sub</span>(<span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">self</span>.<span class="ident">sub</span>(<span class="ident">i</span>)
}
}
<span class="doccomment">/// `NonNull<T>` supports the same offsetting methods under the same</span>
<span class="doccomment">/// safety constraints as the other raw pointer implementations.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// There is no difference - both when offsetting `*mut T` and `NonNull<T>`,</span>
<span class="doccomment">/// the offset is only well defined if we remain inside the same object or</span>
<span class="doccomment">/// one-past the end, and we can never land in a null pointer while obeying</span>
<span class="doccomment">/// those rules.</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">PointerExt</span> <span class="kw">for</span> <span class="ident">NonNull</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">offset</span>(<span class="self">self</span>, <span class="ident">i</span>: <span class="ident">isize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="ident">NonNull</span>::<span class="ident">new_unchecked</span>(<span class="self">self</span>.<span class="ident">as_ptr</span>().<span class="ident">offset</span>(<span class="ident">i</span>))
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">PointerExt</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ptr</span>::<span class="ident">NonNull</span>;
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">it_works</span>() {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">xs</span> <span class="op">=</span> [<span class="number">0</span>; <span class="number">16</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">xs</span>.<span class="ident">as_mut_ptr</span>();
<span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="ident">ptr</span>.<span class="ident">offset</span>(<span class="number">4</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">while</span> <span class="ident">ptr</span> <span class="op">!</span><span class="op">=</span> <span class="ident">end</span> {
<span class="kw-2">*</span><span class="ident">ptr</span>.<span class="ident">post_inc</span>() <span class="op">=</span> <span class="ident">i</span>;
<span class="ident">i</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">xs</span>[..<span class="number">8</span>], <span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>]);
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">nonnull</span>() {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">xs</span> <span class="op">=</span> [<span class="number">0</span>; <span class="number">16</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">NonNull</span>::<span class="ident">new</span>(<span class="ident">xs</span>.<span class="ident">as_mut_ptr</span>()).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="ident">ptr</span>.<span class="ident">offset</span>(<span class="number">4</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">while</span> <span class="ident">ptr</span> <span class="op">!</span><span class="op">=</span> <span class="ident">end</span> {
<span class="kw-2">*</span><span class="ident">ptr</span>.<span class="ident">post_inc</span>().<span class="ident">as_ptr</span>() <span class="op">=</span> <span class="ident">i</span>;
<span class="ident">i</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">xs</span>[..<span class="number">8</span>], <span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>]);
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">nonnull_sub</span>() {
<span class="kw">unsafe</span> {
<span class="comment">// Test NonNull<T> .sub(1) iteration and equivalence to *mut T</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">xs</span> <span class="op">=</span> [<span class="number">0</span>; <span class="number">16</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">xs</span>.<span class="ident">as_mut_ptr</span>().<span class="ident">add</span>(<span class="ident">xs</span>.<span class="ident">len</span>());
<span class="kw">let</span> <span class="ident">nptr</span> <span class="op">=</span> <span class="ident">NonNull</span>::<span class="ident">new</span>(<span class="ident">xs</span>.<span class="ident">as_mut_ptr</span>()).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">nend</span> <span class="op">=</span> <span class="ident">nptr</span>.<span class="ident">add</span>(<span class="ident">xs</span>.<span class="ident">len</span>());
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">while</span> <span class="ident">nptr</span> <span class="op">!</span><span class="op">=</span> <span class="ident">nend</span> {
<span class="ident">nend</span> <span class="op">=</span> <span class="ident">nend</span>.<span class="ident">sub</span>(<span class="number">1</span>);
<span class="ident">ptr</span> <span class="op">=</span> <span class="ident">ptr</span>.<span class="ident">sub</span>(<span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">nend</span>.<span class="ident">as_ptr</span>(), <span class="ident">ptr</span>);
<span class="kw-2">*</span><span class="ident">nend</span>.<span class="ident">as_ptr</span>() <span class="op">=</span> <span class="ident">i</span>;
<span class="ident">i</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">xs</span>[..<span class="number">8</span>], <span class="kw-2">&</span>[<span class="number">15</span>, <span class="number">14</span>, <span class="number">13</span>, <span class="number">12</span>, <span class="number">11</span>, <span class="number">10</span>, <span class="number">9</span>, <span class="number">8</span>]);
}
}
}
</pre></div>
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