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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 to the Rust file `/Users/sambuc/.cargo/registry/src/github.com-1ecc6299db9ec823/arrayref-0.3.6/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs.html -- 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="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="shortcut icon" href="../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">&#9776;</div><a href='../../arrayref/index.html'><div class='logo-container'><img src='../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! This package contains just four macros, which enable the creation</span>
<span class="doccomment">//! of array references to portions of arrays or slices (or things</span>
<span class="doccomment">//! that can be sliced).</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Examples</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Here is a simple example of slicing and dicing a slice into array</span>
<span class="doccomment">//! references with these macros. Here we implement a simple</span>
<span class="doccomment">//! little-endian conversion from bytes to `u16`, and demonstrate code</span>
<span class="doccomment">//! that uses `array_ref!` to extract an array reference from a larger</span>
<span class="doccomment">//! array. Note that the documentation for each macro also has an</span>
<span class="doccomment">//! example of its use.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! #[macro_use]</span>
<span class="doccomment">//! extern crate arrayref;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn read_u16(bytes: &amp;[u8; 2]) -&gt; u16 {</span>
<span class="doccomment">//! bytes[0] as u16 + ((bytes[1] as u16) &lt;&lt; 8)</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! // ...</span>
<span class="doccomment">//! # fn main() {</span>
<span class="doccomment">//! let data = [0,1,2,3,4,0,6,7,8,9];</span>
<span class="doccomment">//! assert_eq!(256, read_u16(array_ref![data,0,2]));</span>
<span class="doccomment">//! assert_eq!(4, read_u16(array_ref![data,4,2]));</span>
<span class="doccomment">//! # }</span>
<span class="doccomment">//! ```</span>
<span class="attribute">#![<span class="ident">deny</span>(<span class="ident">warnings</span>)]</span>
<span class="attribute">#![<span class="ident">no_std</span>]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">std</span>;
<span class="doccomment">/// You can use `array_ref` to generate an array reference to a subset</span>
<span class="doccomment">/// of a sliceable bit of data (which could be an array, or a slice,</span>
<span class="doccomment">/// or a Vec).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Panics** if the slice is out of bounds.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #[macro_use]</span>
<span class="doccomment">/// extern crate arrayref;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn read_u16(bytes: &amp;[u8; 2]) -&gt; u16 {</span>
<span class="doccomment">/// bytes[0] as u16 + ((bytes[1] as u16) &lt;&lt; 8)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// // ...</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let data = [0,1,2,3,4,0,6,7,8,9];</span>
<span class="doccomment">/// assert_eq!(256, read_u16(array_ref![data,0,2]));</span>
<span class="doccomment">/// assert_eq!(4, read_u16(array_ref![data,4,2]));</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">array_ref</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">offset</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">&gt;</span> {{
{
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">as_array</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="ident">slice</span>: <span class="kw-2">&amp;</span>[<span class="ident">T</span>]) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span>[<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>] {
<span class="kw-2">&amp;</span><span class="kw-2">*</span>(<span class="ident">slice</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> [<span class="kw">_</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>])
}
<span class="kw">let</span> <span class="ident">offset</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">offset</span>;
<span class="kw">let</span> <span class="ident">slice</span> <span class="op">=</span> <span class="op">&amp;</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>[<span class="ident">offset</span>..<span class="ident">offset</span> <span class="op">+</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>];
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_unsafe</span>)]</span>
<span class="kw">unsafe</span> {
<span class="ident">as_array</span>(<span class="ident">slice</span>)
}
}
}}
}
<span class="doccomment">/// You can use `array_refs` to generate a series of array references</span>
<span class="doccomment">/// to an input array reference. The idea is if you want to break an</span>
<span class="doccomment">/// array into a series of contiguous and non-overlapping arrays.</span>
<span class="doccomment">/// `array_refs` is a bit funny in that it insists on slicing up the</span>
<span class="doccomment">/// *entire* array. This is intentional, as I find it handy to make</span>
<span class="doccomment">/// me ensure that my sub-arrays add up to the entire array. This</span>
<span class="doccomment">/// macro will *never* panic, since the sizes are all checked at</span>
<span class="doccomment">/// compile time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that unlike `array_ref!`, `array_refs` *requires* that the</span>
<span class="doccomment">/// first argument be an array reference. The following arguments are</span>
<span class="doccomment">/// the lengths of each subarray you wish a reference to. The total</span>
<span class="doccomment">/// of these arguments *must* equal the size of the array itself.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #[macro_use]</span>
<span class="doccomment">/// extern crate arrayref;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn read_u16(bytes: &amp;[u8; 2]) -&gt; u16 {</span>
<span class="doccomment">/// bytes[0] as u16 + ((bytes[1] as u16) &lt;&lt; 8)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// // ...</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let data = [0,1,2,3,4,0,6,7];</span>
<span class="doccomment">/// let (a,b,c) = array_refs![&amp;data,2,2,4];</span>
<span class="doccomment">/// assert_eq!(read_u16(a), 256);</span>
<span class="doccomment">/// assert_eq!(read_u16(b), 3*256+2);</span>
<span class="doccomment">/// assert_eq!(*c, [4,0,6,7]);</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">array_refs</span> {
( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>:<span class="ident">expr</span>, $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">pre</span>:<span class="ident">expr</span> ),<span class="op">*</span> ; .. ; $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">post</span>:<span class="ident">expr</span> ),<span class="op">*</span> ) <span class="op">=</span><span class="op">&gt;</span> {{
{
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">slice</span>;
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_assignments</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">eval_order_dependence</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">as_arrays</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="ident">a</span>: <span class="kw-2">&amp;</span>[<span class="ident">T</span>]) <span class="op">-</span><span class="op">&gt;</span> ( $( <span class="kw-2">&amp;</span>[<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">pre</span>], )<span class="op">*</span> <span class="kw-2">&amp;</span>[<span class="ident">T</span>], $( <span class="kw-2">&amp;</span>[<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">post</span>], )<span class="kw-2">*</span>) {
<span class="kw">let</span> <span class="ident">min_len</span> <span class="op">=</span> $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">pre</span> <span class="op">+</span> )<span class="op">*</span> $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">post</span> <span class="op">+</span> )<span class="op">*</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="ident">var_len</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">min_len</span>;
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">len</span>() <span class="op">&gt;</span><span class="op">=</span> <span class="ident">min_len</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">as_ptr</span>();
( $( {
<span class="kw">let</span> <span class="ident">aref</span> <span class="op">=</span> <span class="op">&amp;</span> <span class="kw-2">*</span>(<span class="ident">p</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">pre</span>]);
<span class="ident">p</span> <span class="op">=</span> <span class="ident">p</span>.<span class="ident">offset</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pre</span> <span class="kw">as</span> <span class="ident">isize</span>);
<span class="ident">aref</span>
} ),<span class="op">*</span> , {
<span class="kw">let</span> <span class="ident">sl</span> <span class="op">=</span> <span class="ident">slice</span>::<span class="ident">from_raw_parts</span>(<span class="ident">p</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">var_len</span>);
<span class="ident">p</span> <span class="op">=</span> <span class="ident">p</span>.<span class="ident">offset</span>(<span class="ident">var_len</span> <span class="kw">as</span> <span class="ident">isize</span>);
<span class="ident">sl</span>
}, $( {
<span class="kw">let</span> <span class="ident">aref</span> <span class="op">=</span> <span class="op">&amp;</span> <span class="kw-2">*</span>(<span class="ident">p</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">post</span>]);
<span class="ident">p</span> <span class="op">=</span> <span class="ident">p</span>.<span class="ident">offset</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">post</span> <span class="kw">as</span> <span class="ident">isize</span>);
<span class="ident">aref</span>
} ),<span class="kw-2">*</span>)
}
<span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>;
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_unsafe</span>)]</span>
<span class="kw">unsafe</span> {
<span class="ident">as_arrays</span>(<span class="ident">input</span>)
}
}
}};
( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>:<span class="ident">expr</span>, $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>:<span class="ident">expr</span> ),<span class="op">*</span> ) <span class="op">=</span><span class="op">&gt;</span> {{
{
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_assignments</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">eval_order_dependence</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">as_arrays</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="ident">a</span>: <span class="kw-2">&amp;</span>[<span class="ident">T</span>; $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span> <span class="op">+</span> )<span class="op">*</span> <span class="number">0</span> ]) <span class="op">-</span><span class="op">&gt;</span> ( $( <span class="kw-2">&amp;</span>[<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>], )<span class="op">*</span> ) {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">as_ptr</span>();
( $( {
<span class="kw">let</span> <span class="ident">aref</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">*</span>(<span class="ident">p</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>]);
<span class="ident">p</span> <span class="op">=</span> <span class="ident">p</span>.<span class="ident">offset</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span> <span class="kw">as</span> <span class="ident">isize</span>);
<span class="ident">aref</span>
} ),<span class="op">*</span> )
}
<span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>;
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_unsafe</span>)]</span>
<span class="kw">unsafe</span> {
<span class="ident">as_arrays</span>(<span class="ident">input</span>)
}
}
}}
}
<span class="doccomment">/// You can use `mut_array_refs` to generate a series of mutable array</span>
<span class="doccomment">/// references to an input mutable array reference. The idea is if</span>
<span class="doccomment">/// you want to break an array into a series of contiguous and</span>
<span class="doccomment">/// non-overlapping mutable array references. Like `array_refs!`,</span>
<span class="doccomment">/// `mut_array_refs!` is a bit funny in that it insists on slicing up</span>
<span class="doccomment">/// the *entire* array. This is intentional, as I find it handy to</span>
<span class="doccomment">/// make me ensure that my sub-arrays add up to the entire array.</span>
<span class="doccomment">/// This macro will *never* panic, since the sizes are all checked at</span>
<span class="doccomment">/// compile time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that unlike `array_mut_ref!`, `mut_array_refs` *requires*</span>
<span class="doccomment">/// that the first argument be a mutable array reference. The</span>
<span class="doccomment">/// following arguments are the lengths of each subarray you wish a</span>
<span class="doccomment">/// reference to. The total of these arguments *must* equal the size</span>
<span class="doccomment">/// of the array itself. Also note that this macro allows you to take</span>
<span class="doccomment">/// out multiple mutable references to a single object, which is both</span>
<span class="doccomment">/// weird and powerful.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #[macro_use]</span>
<span class="doccomment">/// extern crate arrayref;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn write_u16(bytes: &amp;mut [u8; 2], num: u16) {</span>
<span class="doccomment">/// bytes[0] = num as u8;</span>
<span class="doccomment">/// bytes[1] = (num &gt;&gt; 8) as u8;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// fn write_u32(bytes: &amp;mut [u8; 4], num: u32) {</span>
<span class="doccomment">/// bytes[0] = num as u8;</span>
<span class="doccomment">/// bytes[1] = (num &gt;&gt; 8) as u8; // this is buggy to save space...</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// // ...</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let mut data = [0,1,2,3,4,0,6,7];</span>
<span class="doccomment">/// let (a,b,c) = mut_array_refs![&amp;mut data,2,2,4];</span>
<span class="doccomment">/// // let&#39;s write out some nice prime numbers!</span>
<span class="doccomment">/// write_u16(a, 37);</span>
<span class="doccomment">/// write_u16(b, 73);</span>
<span class="doccomment">/// write_u32(c, 137); // approximate inverse of the fine structure constant!</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">mut_array_refs</span> {
( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>:<span class="ident">expr</span>, $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">pre</span>:<span class="ident">expr</span> ),<span class="op">*</span> ; .. ; $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">post</span>:<span class="ident">expr</span> ),<span class="op">*</span> ) <span class="op">=</span><span class="op">&gt;</span> {{
{
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">slice</span>;
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_assignments</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">eval_order_dependence</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">as_arrays</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="ident">a</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-</span><span class="op">&gt;</span> ( $( <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">pre</span>], )<span class="op">*</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">T</span>], $( <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">post</span>], )<span class="kw-2">*</span>) {
<span class="kw">let</span> <span class="ident">min_len</span> <span class="op">=</span> $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">pre</span> <span class="op">+</span> )<span class="op">*</span> $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">post</span> <span class="op">+</span> )<span class="op">*</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="ident">var_len</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">min_len</span>;
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">len</span>() <span class="op">&gt;</span><span class="op">=</span> <span class="ident">min_len</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">as_mut_ptr</span>();
( $( {
<span class="kw">let</span> <span class="ident">aref</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="kw-2">*</span>(<span class="ident">p</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">pre</span>]);
<span class="ident">p</span> <span class="op">=</span> <span class="ident">p</span>.<span class="ident">offset</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pre</span> <span class="kw">as</span> <span class="ident">isize</span>);
<span class="ident">aref</span>
} ),<span class="op">*</span> , {
<span class="kw">let</span> <span class="ident">sl</span> <span class="op">=</span> <span class="ident">slice</span>::<span class="ident">from_raw_parts_mut</span>(<span class="ident">p</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">var_len</span>);
<span class="ident">p</span> <span class="op">=</span> <span class="ident">p</span>.<span class="ident">offset</span>(<span class="ident">var_len</span> <span class="kw">as</span> <span class="ident">isize</span>);
<span class="ident">sl</span>
}, $( {
<span class="kw">let</span> <span class="ident">aref</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="kw-2">*</span>(<span class="ident">p</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">post</span>]);
<span class="ident">p</span> <span class="op">=</span> <span class="ident">p</span>.<span class="ident">offset</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">post</span> <span class="kw">as</span> <span class="ident">isize</span>);
<span class="ident">aref</span>
} ),<span class="kw-2">*</span>)
}
<span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>;
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_unsafe</span>)]</span>
<span class="kw">unsafe</span> {
<span class="ident">as_arrays</span>(<span class="ident">input</span>)
}
}
}};
( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>:<span class="ident">expr</span>, $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>:<span class="ident">expr</span> ),<span class="op">*</span> ) <span class="op">=</span><span class="op">&gt;</span> {{
{
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_assignments</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">eval_order_dependence</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">as_arrays</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="ident">a</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">T</span>; $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span> <span class="op">+</span> )<span class="op">*</span> <span class="number">0</span> ]) <span class="op">-</span><span class="op">&gt;</span> ( $( <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>], )<span class="op">*</span> ) {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">as_mut_ptr</span>();
( $( {
<span class="kw">let</span> <span class="ident">aref</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="kw-2">*</span>(<span class="ident">p</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>]);
<span class="ident">p</span> <span class="op">=</span> <span class="ident">p</span>.<span class="ident">offset</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span> <span class="kw">as</span> <span class="ident">isize</span>);
<span class="ident">aref</span>
} ),<span class="op">*</span> )
}
<span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>;
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_unsafe</span>)]</span>
<span class="kw">unsafe</span> {
<span class="ident">as_arrays</span>(<span class="ident">input</span>)
}
}
}};
}
<span class="doccomment">/// You can use `array_mut_ref` to generate a mutable array reference</span>
<span class="doccomment">/// to a subset of a sliceable bit of data (which could be an array,</span>
<span class="doccomment">/// or a slice, or a Vec).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Panics** if the slice is out of bounds.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #[macro_use]</span>
<span class="doccomment">/// extern crate arrayref;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn write_u16(bytes: &amp;mut [u8; 2], num: u16) {</span>
<span class="doccomment">/// bytes[0] = num as u8;</span>
<span class="doccomment">/// bytes[1] = (num &gt;&gt; 8) as u8;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// // ...</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// let mut data = [0,1,2,3,4,0,6,7,8,9];</span>
<span class="doccomment">/// write_u16(array_mut_ref![data,0,2], 1);</span>
<span class="doccomment">/// write_u16(array_mut_ref![data,2,2], 5);</span>
<span class="doccomment">/// assert_eq!(*array_ref![data,0,4], [1,0,5,0]);</span>
<span class="doccomment">/// *array_mut_ref![data,4,5] = [4,3,2,1,0];</span>
<span class="doccomment">/// assert_eq!(data, [1,0,5,0,4,3,2,1,0,9]);</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">array_mut_ref</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">offset</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">&gt;</span> {{
{
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">as_array</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="ident">slice</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>] {
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="kw-2">*</span>(<span class="ident">slice</span>.<span class="ident">as_mut_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> [<span class="kw">_</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>])
}
<span class="kw">let</span> <span class="ident">offset</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">offset</span>;
<span class="kw">let</span> <span class="ident">slice</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>[<span class="ident">offset</span>..<span class="ident">offset</span> <span class="op">+</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">len</span>];
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_unsafe</span>)]</span>
<span class="kw">unsafe</span> {
<span class="ident">as_array</span>(<span class="ident">slice</span>)
}
}
}}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">test</span> {
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">quickcheck</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">vec</span>::<span class="ident">Vec</span>;
<span class="comment">// use super::*;</span>
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">should_panic</span>]</span>
<span class="kw">fn</span> <span class="ident">checks_bounds</span>() {
<span class="kw">let</span> <span class="ident">foo</span>: [<span class="ident">u8</span>; <span class="number">11</span>] <span class="op">=</span> [<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">10</span>];
<span class="kw">let</span> <span class="ident">bar</span> <span class="op">=</span> <span class="macro">array_ref</span><span class="macro">!</span>(<span class="ident">foo</span>, <span class="number">1</span>, <span class="number">11</span>);
<span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;I am checking that I can dereference bar[0] = {}&quot;</span>, <span class="ident">bar</span>[<span class="number">0</span>]);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">simple_case_works</span>() {
<span class="kw">fn</span> <span class="ident">check</span>(<span class="ident">expected</span>: [<span class="ident">u8</span>; <span class="number">3</span>], <span class="ident">actual</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>; <span class="number">3</span>]) {
<span class="kw">for</span> (<span class="ident">e</span>, <span class="ident">a</span>) <span class="kw">in</span> (<span class="kw-2">&amp;</span><span class="ident">expected</span>).<span class="ident">iter</span>().<span class="ident">zip</span>(<span class="ident">actual</span>.<span class="ident">iter</span>()) {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">e</span>, <span class="ident">a</span>)
}
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">foo</span>: [<span class="ident">u8</span>; <span class="number">11</span>] <span class="op">=</span> [<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">10</span>];
{
<span class="kw">let</span> <span class="ident">bar</span> <span class="op">=</span> <span class="macro">array_ref</span><span class="macro">!</span>(<span class="ident">foo</span>, <span class="number">2</span>, <span class="number">3</span>);
<span class="ident">check</span>([<span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>], <span class="ident">bar</span>);
}
<span class="ident">check</span>([<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>], <span class="macro">array_ref</span><span class="macro">!</span>(<span class="ident">foo</span>, <span class="number">0</span>, <span class="number">3</span>));
<span class="kw">fn</span> <span class="ident">zero2</span>(<span class="ident">x</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">u8</span>; <span class="number">2</span>]) {
<span class="ident">x</span>[<span class="number">0</span>] <span class="op">=</span> <span class="number">0</span>;
<span class="ident">x</span>[<span class="number">1</span>] <span class="op">=</span> <span class="number">0</span>;
}
<span class="ident">zero2</span>(<span class="macro">array_mut_ref</span><span class="macro">!</span>(<span class="ident">foo</span>, <span class="number">8</span>, <span class="number">2</span>));
<span class="ident">check</span>([<span class="number">0</span>, <span class="number">0</span>, <span class="number">10</span>], <span class="macro">array_ref</span><span class="macro">!</span>(<span class="ident">foo</span>, <span class="number">8</span>, <span class="number">3</span>));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">check_array_ref_5</span>() {
<span class="kw">fn</span> <span class="ident">f</span>(<span class="ident">data</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>, <span class="ident">offset</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">quickcheck</span>::<span class="ident">TestResult</span> {
<span class="kw">if</span> <span class="ident">data</span>.<span class="ident">len</span>() <span class="op">&lt;</span> <span class="ident">offset</span> <span class="op">+</span> <span class="number">5</span> {
<span class="kw">return</span> <span class="ident">quickcheck</span>::<span class="ident">TestResult</span>::<span class="ident">discard</span>();
}
<span class="kw">let</span> <span class="ident">out</span> <span class="op">=</span> <span class="macro">array_ref</span><span class="macro">!</span>(<span class="ident">data</span>, <span class="ident">offset</span>, <span class="number">5</span>);
<span class="ident">quickcheck</span>::<span class="ident">TestResult</span>::<span class="ident">from_bool</span>(<span class="ident">out</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">5</span>)
}
<span class="ident">quickcheck</span>::<span class="ident">quickcheck</span>(<span class="ident">f</span> <span class="kw">as</span> <span class="kw">fn</span>(<span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>, <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">quickcheck</span>::<span class="ident">TestResult</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">check_array_ref_out_of_bounds_5</span>() {
<span class="kw">fn</span> <span class="ident">f</span>(<span class="ident">data</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>, <span class="ident">offset</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">quickcheck</span>::<span class="ident">TestResult</span> {
<span class="kw">if</span> <span class="ident">data</span>.<span class="ident">len</span>() <span class="op">&gt;</span><span class="op">=</span> <span class="ident">offset</span> <span class="op">+</span> <span class="number">5</span> {
<span class="kw">return</span> <span class="ident">quickcheck</span>::<span class="ident">TestResult</span>::<span class="ident">discard</span>();
}
<span class="ident">quickcheck</span>::<span class="ident">TestResult</span>::<span class="ident">must_fail</span>(<span class="kw">move</span> <span class="op">|</span><span class="op">|</span> {
<span class="macro">array_ref</span><span class="macro">!</span>(<span class="ident">data</span>, <span class="ident">offset</span>, <span class="number">5</span>);
})
}
<span class="ident">quickcheck</span>::<span class="ident">quickcheck</span>(<span class="ident">f</span> <span class="kw">as</span> <span class="kw">fn</span>(<span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>, <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">quickcheck</span>::<span class="ident">TestResult</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">check_array_mut_ref_7</span>() {
<span class="kw">fn</span> <span class="ident">f</span>(<span class="kw-2">mut</span> <span class="ident">data</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>, <span class="ident">offset</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">quickcheck</span>::<span class="ident">TestResult</span> {
<span class="kw">if</span> <span class="ident">data</span>.<span class="ident">len</span>() <span class="op">&lt;</span> <span class="ident">offset</span> <span class="op">+</span> <span class="number">7</span> {
<span class="kw">return</span> <span class="ident">quickcheck</span>::<span class="ident">TestResult</span>::<span class="ident">discard</span>();
}
<span class="kw">let</span> <span class="ident">out</span> <span class="op">=</span> <span class="macro">array_mut_ref</span><span class="macro">!</span>(<span class="ident">data</span>, <span class="ident">offset</span>, <span class="number">7</span>);
<span class="ident">out</span>[<span class="number">6</span>] <span class="op">=</span> <span class="number">3</span>;
<span class="ident">quickcheck</span>::<span class="ident">TestResult</span>::<span class="ident">from_bool</span>(<span class="ident">out</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">7</span>)
}
<span class="ident">quickcheck</span>::<span class="ident">quickcheck</span>(<span class="ident">f</span> <span class="kw">as</span> <span class="kw">fn</span>(<span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>, <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">quickcheck</span>::<span class="ident">TestResult</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">check_array_mut_ref_out_of_bounds_32</span>() {
<span class="kw">fn</span> <span class="ident">f</span>(<span class="kw-2">mut</span> <span class="ident">data</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>, <span class="ident">offset</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">quickcheck</span>::<span class="ident">TestResult</span> {
<span class="kw">if</span> <span class="ident">data</span>.<span class="ident">len</span>() <span class="op">&gt;</span><span class="op">=</span> <span class="ident">offset</span> <span class="op">+</span> <span class="number">32</span> {
<span class="kw">return</span> <span class="ident">quickcheck</span>::<span class="ident">TestResult</span>::<span class="ident">discard</span>();
}
<span class="ident">quickcheck</span>::<span class="ident">TestResult</span>::<span class="ident">must_fail</span>(<span class="kw">move</span> <span class="op">|</span><span class="op">|</span> {
<span class="macro">array_mut_ref</span><span class="macro">!</span>(<span class="ident">data</span>, <span class="ident">offset</span>, <span class="number">32</span>);
})
}
<span class="ident">quickcheck</span>::<span class="ident">quickcheck</span>(<span class="ident">f</span> <span class="kw">as</span> <span class="kw">fn</span>(<span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>, <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">quickcheck</span>::<span class="ident">TestResult</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_5_array_refs</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">data</span>: [<span class="ident">usize</span>; <span class="number">128</span>] <span class="op">=</span> [<span class="number">0</span>; <span class="number">128</span>];
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">128</span> {
<span class="ident">data</span>[<span class="ident">i</span>] <span class="op">=</span> <span class="ident">i</span>;
}
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="ident">data</span>;
<span class="kw">let</span> (<span class="ident">a</span>,<span class="ident">b</span>,<span class="ident">c</span>,<span class="ident">d</span>,<span class="ident">e</span>) <span class="op">=</span> <span class="macro">array_refs</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">data</span>, <span class="number">1</span>, <span class="number">14</span>, <span class="number">3</span>, <span class="number">100</span>, <span class="number">10</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">len</span>(), <span class="number">1</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">len</span>(), <span class="number">14</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">c</span>.<span class="ident">len</span>(), <span class="number">3</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">len</span>(), <span class="number">100</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">e</span>.<span class="ident">len</span>(), <span class="number">10</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>, <span class="macro">array_ref</span><span class="macro">!</span>[<span class="ident">data</span>, <span class="number">0</span>, <span class="number">1</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">b</span>, <span class="macro">array_ref</span><span class="macro">!</span>[<span class="ident">data</span>, <span class="number">1</span>, <span class="number">14</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">c</span>, <span class="macro">array_ref</span><span class="macro">!</span>[<span class="ident">data</span>, <span class="number">15</span>, <span class="number">3</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">e</span>, <span class="macro">array_ref</span><span class="macro">!</span>[<span class="ident">data</span>, <span class="number">118</span>, <span class="number">10</span>]);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_5_array_refs_dotdot</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">data</span>: [<span class="ident">usize</span>; <span class="number">128</span>] <span class="op">=</span> [<span class="number">0</span>; <span class="number">128</span>];
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">128</span> {
<span class="ident">data</span>[<span class="ident">i</span>] <span class="op">=</span> <span class="ident">i</span>;
}
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="ident">data</span>;
<span class="kw">let</span> (<span class="ident">a</span>,<span class="ident">b</span>,<span class="ident">c</span>,<span class="ident">d</span>,<span class="ident">e</span>) <span class="op">=</span> <span class="macro">array_refs</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">data</span>, <span class="number">1</span>, <span class="number">14</span>, <span class="number">3</span>; ..; <span class="number">10</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">len</span>(), <span class="number">1</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">len</span>(), <span class="number">14</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">c</span>.<span class="ident">len</span>(), <span class="number">3</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">len</span>(), <span class="number">100</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">e</span>.<span class="ident">len</span>(), <span class="number">10</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>, <span class="macro">array_ref</span><span class="macro">!</span>[<span class="ident">data</span>, <span class="number">0</span>, <span class="number">1</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">b</span>, <span class="macro">array_ref</span><span class="macro">!</span>[<span class="ident">data</span>, <span class="number">1</span>, <span class="number">14</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">c</span>, <span class="macro">array_ref</span><span class="macro">!</span>[<span class="ident">data</span>, <span class="number">15</span>, <span class="number">3</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">e</span>, <span class="macro">array_ref</span><span class="macro">!</span>[<span class="ident">data</span>, <span class="number">118</span>, <span class="number">10</span>]);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_5_mut_xarray_refs</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">data</span>: [<span class="ident">usize</span>; <span class="number">128</span>] <span class="op">=</span> [<span class="number">0</span>; <span class="number">128</span>];
{
<span class="comment">// temporarily borrow the data to modify it.</span>
<span class="kw">let</span> (<span class="ident">a</span>,<span class="ident">b</span>,<span class="ident">c</span>,<span class="ident">d</span>,<span class="ident">e</span>) <span class="op">=</span> <span class="macro">mut_array_refs</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">data</span>, <span class="number">1</span>, <span class="number">14</span>, <span class="number">3</span>, <span class="number">100</span>, <span class="number">10</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">len</span>(), <span class="number">1</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">len</span>(), <span class="number">14</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">c</span>.<span class="ident">len</span>(), <span class="number">3</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">len</span>(), <span class="number">100</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">e</span>.<span class="ident">len</span>(), <span class="number">10</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="kw-2">*</span><span class="ident">a</span> <span class="op">=</span> [<span class="number">1</span>; <span class="number">1</span>];
<span class="kw-2">*</span><span class="ident">b</span> <span class="op">=</span> [<span class="number">14</span>; <span class="number">14</span>];
<span class="kw-2">*</span><span class="ident">c</span> <span class="op">=</span> [<span class="number">3</span>; <span class="number">3</span>];
<span class="kw-2">*</span><span class="ident">d</span> <span class="op">=</span> [<span class="number">100</span>; <span class="number">100</span>];
<span class="kw-2">*</span><span class="ident">e</span> <span class="op">=</span> [<span class="number">10</span>; <span class="number">10</span>];
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&amp;</span>[<span class="number">1</span>;<span class="number">1</span>], <span class="macro">array_ref</span><span class="macro">!</span>[<span class="ident">data</span>, <span class="number">0</span>, <span class="number">1</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&amp;</span>[<span class="number">14</span>;<span class="number">14</span>], <span class="macro">array_ref</span><span class="macro">!</span>[<span class="ident">data</span>, <span class="number">1</span>, <span class="number">14</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&amp;</span>[<span class="number">3</span>;<span class="number">3</span>], <span class="macro">array_ref</span><span class="macro">!</span>[<span class="ident">data</span>, <span class="number">15</span>, <span class="number">3</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&amp;</span>[<span class="number">10</span>;<span class="number">10</span>], <span class="macro">array_ref</span><span class="macro">!</span>[<span class="ident">data</span>, <span class="number">118</span>, <span class="number">10</span>]);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_5_mut_xarray_refs_with_dotdot</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">data</span>: [<span class="ident">usize</span>; <span class="number">128</span>] <span class="op">=</span> [<span class="number">0</span>; <span class="number">128</span>];
{
<span class="comment">// temporarily borrow the data to modify it.</span>
<span class="kw">let</span> (<span class="ident">a</span>,<span class="ident">b</span>,<span class="ident">c</span>,<span class="ident">d</span>,<span class="ident">e</span>) <span class="op">=</span> <span class="macro">mut_array_refs</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">data</span>, <span class="number">1</span>, <span class="number">14</span>, <span class="number">3</span>; ..; <span class="number">10</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">len</span>(), <span class="number">1</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">len</span>(), <span class="number">14</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">c</span>.<span class="ident">len</span>(), <span class="number">3</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">len</span>(), <span class="number">100</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">e</span>.<span class="ident">len</span>(), <span class="number">10</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="kw-2">*</span><span class="ident">a</span> <span class="op">=</span> [<span class="number">1</span>; <span class="number">1</span>];
<span class="kw-2">*</span><span class="ident">b</span> <span class="op">=</span> [<span class="number">14</span>; <span class="number">14</span>];
<span class="kw-2">*</span><span class="ident">c</span> <span class="op">=</span> [<span class="number">3</span>; <span class="number">3</span>];
<span class="kw-2">*</span><span class="ident">e</span> <span class="op">=</span> [<span class="number">10</span>; <span class="number">10</span>];
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&amp;</span>[<span class="number">1</span>;<span class="number">1</span>], <span class="macro">array_ref</span><span class="macro">!</span>[<span class="ident">data</span>, <span class="number">0</span>, <span class="number">1</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&amp;</span>[<span class="number">14</span>;<span class="number">14</span>], <span class="macro">array_ref</span><span class="macro">!</span>[<span class="ident">data</span>, <span class="number">1</span>, <span class="number">14</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&amp;</span>[<span class="number">3</span>;<span class="number">3</span>], <span class="macro">array_ref</span><span class="macro">!</span>[<span class="ident">data</span>, <span class="number">15</span>, <span class="number">3</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&amp;</span>[<span class="number">10</span>;<span class="number">10</span>], <span class="macro">array_ref</span><span class="macro">!</span>[<span class="ident">data</span>, <span class="number">118</span>, <span class="number">10</span>]);
}
} <span class="comment">// mod test</span>
</pre></div>
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