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‎data_structures/bitfield.html‎

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@@ -161,10 +161,10 @@ <h1 class="menu-title">Rust Cookbook</h1>
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<main>
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<h1 id="bitfield"><a class="header" href="#bitfield">Bitfield</a></h1>
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<h2 id="define-and-operate-on-a-type-represented-as-a-bitfield"><a class="header" href="#define-and-operate-on-a-type-represented-as-a-bitfield">Define and operate on a type represented as a bitfield</a></h2>
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<p>[![bitflags-badge]][bitflags] [![cat-no-std-badge]][cat-no-std]</p>
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<p><a href="https://docs.rs/bitflags/"><img src="https://badge-cache.kominick.com/crates/v/bitflags.svg?label=bitflags" alt="bitflags-badge" /></a> <a href="https://crates.io/categories/no-std"><img src="https://badge-cache.kominick.com/badge/no_std--x.svg?style=social" alt="cat-no-std-badge" /></a></p>
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<p>Creates type safe bitfield type <code>MyFlags</code> with elementary <code>clear</code> operation as well as [<code>Display</code>] trait for it.
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Subsequently, shows basic bitwise operations and formatting.</p>
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<pre><pre class="playground"><code class="language-rust edition2018">use std::fmt;
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<pre><pre class="playground"><code class="language-rust edition2021">use std::fmt;
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#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
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struct MyFlags(u32);
@@ -226,169 +226,23 @@ <h2 id="define-and-operate-on-a-type-represented-as-a-bitfield"><a class="header
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fn main() {
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let e1 = MyFlags::FLAG_A | MyFlags::FLAG_C;
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let e2 = MyFlags::FLAG_B | MyFlags::FLAG_C;
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assert_eq!((e1 | e2), MyFlags::FLAG_ABC);
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assert_eq!((e1 &amp; e2), MyFlags::FLAG_C);
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assert_eq!((e1 - e2), MyFlags::FLAG_A);
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assert_eq!(!e2, MyFlags::FLAG_A);
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assert_eq!((e1 | e2), MyFlags::FLAG_ABC);
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assert_eq!((e1 &amp; e2), MyFlags::FLAG_C);
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assert_eq!((e1 - e2), MyFlags::FLAG_A);
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assert_eq!(!e2, MyFlags::FLAG_A);
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let mut flags = MyFlags::FLAG_ABC;
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assert_eq!(format!("{}", flags), "00000000000000000000000000000111");
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assert_eq!(format!("{}", flags.clear()), "00000000000000000000000000000000");
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assert_eq!(format!("{:?}", MyFlags::FLAG_B), "MyFlags(2)");
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assert_eq!(format!("{:?}", MyFlags::FLAG_A | MyFlags::FLAG_B), "MyFlags(3)");
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}
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&lt;!--
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}</code></pre></pre>
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‎hardware/processor.html‎

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@@ -162,7 +162,7 @@ <h1 class="menu-title">Rust Cookbook</h1>
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<h1 id="processor"><a class="header" href="#processor">Processor</a></h1>
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<h2 id="check-number-of-logical-cpu-cores"><a class="header" href="#check-number-of-logical-cpu-cores">Check number of logical cpu cores</a></h2>
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<p><a href="https://docs.rs/num_cpus/"><img src="https://badge-cache.kominick.com/crates/v/num_cpus.svg?label=num_cpus" alt="num_cpus-badge" /></a> <a href="https://crates.io/categories/hardware-support"><img src="https://badge-cache.kominick.com/badge/hardware_support--x.svg?style=social" alt="cat-hardware-support-badge" /></a></p>
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<p>Shows the number of logical CPU cores in current machine using [<code>num_cpus::get</code>].</p>
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<p>Shows the number of logical CPU cores in current machine using <a href="https://docs.rs/num_cpus/latest/num_cpus/fn.get.html"><code>num_cpus::get</code></a>.</p>
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<pre><pre class="playground"><code class="language-rust edition2021">fn main() {
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println!("Number of logical cores is {}", num_cpus::get());
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}</code></pre></pre>

‎mem/global_static.html‎

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@@ -187,6 +187,21 @@ <h2 id="declare-lazily-evaluated-constant"><a class="header" href="#declare-lazi
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show_access("Jim");
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}</code></pre></pre>
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<h2 id="stdcell"><a class="header" href="#stdcell">Std:cell</a></h2>
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<p><a href="https://doc.rust-lang.org/beta/std/cell/struct.OnceCell.html"><code>OnceCell</code></a> is included in the standard library as an alternative.</p>
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<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
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</span><span class="boring">fn main() {
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</span>use std::cell::OnceCell;
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let cell = OnceCell::new();
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assert!(cell.get().is_none());
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let value: &amp;String = cell.get_or_init(|| {
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"Hello, World!".to_string()
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});
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assert_eq!(value, "Hello, World!");
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assert!(cell.get().is_some());
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<span class="boring">}</span></code></pre></pre>
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