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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="API documentation for the Rust `bitflags` macro in crate `bitflags`."><meta name="keywords" content="rust, rustlang, rust-lang, bitflags"><title>bitflags::bitflags - Rust</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><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../favicon.svg">
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<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"><h1 class="fqn"><span class="in-band">Macro <a href="index.html">bitflags</a>::<wbr><a class="macro" href="">bitflags</a></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../src/bitflags/lib.rs.html#333-391" title="goto source code">[src]</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><div class="example-wrap"><pre class="rust macro">
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">bitflags</span> {
(
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">outer</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">BitFlags</span>:<span class="ident">ident</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>:<span class="ident">ty</span> {
$(
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">inner</span>:<span class="ident">ident</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">args</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>]</span>)<span class="op">*</span>
<span class="kw">const</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Flag</span>:<span class="ident">ident</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">value</span>:<span class="ident">expr</span>;
)<span class="op">+</span>
}
) <span class="op">=</span><span class="op">&gt;</span> { ... };
(
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">outer</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span>
<span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">BitFlags</span>:<span class="ident">ident</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>:<span class="ident">ty</span> {
$(
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">inner</span>:<span class="ident">ident</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">args</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>]</span>)<span class="op">*</span>
<span class="kw">const</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Flag</span>:<span class="ident">ident</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">value</span>:<span class="ident">expr</span>;
)<span class="op">+</span>
}
) <span class="op">=</span><span class="op">&gt;</span> { ... };
(
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">outer</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span>
<span class="kw">pub</span> ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">vis</span>:<span class="ident">tt</span>)<span class="op">+</span>) <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">BitFlags</span>:<span class="ident">ident</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>:<span class="ident">ty</span> {
$(
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">inner</span>:<span class="ident">ident</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">args</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>]</span>)<span class="op">*</span>
<span class="kw">const</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Flag</span>:<span class="ident">ident</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">value</span>:<span class="ident">expr</span>;
)<span class="op">+</span>
}
) <span class="op">=</span><span class="op">&gt;</span> { ... };
}</pre></div>
</div><div class="docblock"><p>The macro used to generate the flag structure.</p>
<p>See the <a href="../bitflags/index.html">crate level docs</a> for complete documentation.</p>
<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">bitflags</span>;
<span class="macro">bitflags</span><span class="macro">!</span> {
<span class="kw">struct</span> <span class="ident">Flags</span>: <span class="ident">u32</span> {
<span class="kw">const</span> <span class="ident">A</span> <span class="op">=</span> <span class="number">0b00000001</span>;
<span class="kw">const</span> <span class="ident">B</span> <span class="op">=</span> <span class="number">0b00000010</span>;
<span class="kw">const</span> <span class="ident">C</span> <span class="op">=</span> <span class="number">0b00000100</span>;
<span class="kw">const</span> <span class="ident">ABC</span> <span class="op">=</span> <span class="self">Self</span>::<span class="ident">A</span>.<span class="ident">bits</span> <span class="op">|</span> <span class="self">Self</span>::<span class="ident">B</span>.<span class="ident">bits</span> <span class="op">|</span> <span class="self">Self</span>::<span class="ident">C</span>.<span class="ident">bits</span>;
}
}
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="ident">e1</span> <span class="op">=</span> <span class="ident">Flags</span>::<span class="ident">A</span> <span class="op">|</span> <span class="ident">Flags</span>::<span class="ident">C</span>;
<span class="kw">let</span> <span class="ident">e2</span> <span class="op">=</span> <span class="ident">Flags</span>::<span class="ident">B</span> <span class="op">|</span> <span class="ident">Flags</span>::<span class="ident">C</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="ident">e1</span> <span class="op">|</span> <span class="ident">e2</span>), <span class="ident">Flags</span>::<span class="ident">ABC</span>); <span class="comment">// union</span>
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="ident">e1</span> <span class="op">&amp;</span> <span class="ident">e2</span>), <span class="ident">Flags</span>::<span class="ident">C</span>); <span class="comment">// intersection</span>
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="ident">e1</span> <span class="op">-</span> <span class="ident">e2</span>), <span class="ident">Flags</span>::<span class="ident">A</span>); <span class="comment">// set difference</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">e2</span>, <span class="ident">Flags</span>::<span class="ident">A</span>); <span class="comment">// set complement</span>
}</pre></div>
<p>The generated <code>struct</code>s can also be extended with type and trait
implementations:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">bitflags</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>;
<span class="macro">bitflags</span><span class="macro">!</span> {
<span class="kw">struct</span> <span class="ident">Flags</span>: <span class="ident">u32</span> {
<span class="kw">const</span> <span class="ident">A</span> <span class="op">=</span> <span class="number">0b00000001</span>;
<span class="kw">const</span> <span class="ident">B</span> <span class="op">=</span> <span class="number">0b00000010</span>;
}
}
<span class="kw">impl</span> <span class="ident">Flags</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clear</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="self">self</span>.<span class="ident">bits</span> <span class="op">=</span> <span class="number">0</span>; <span class="comment">// The `bits` field can be accessed from within the</span>
<span class="comment">// same module where the `bitflags!` macro was invoked.</span>
}
}
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Flags</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;hi!&quot;</span>)
}
}
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">flags</span> <span class="op">=</span> <span class="ident">Flags</span>::<span class="ident">A</span> <span class="op">|</span> <span class="ident">Flags</span>::<span class="ident">B</span>;
<span class="ident">flags</span>.<span class="ident">clear</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">flags</span>.<span class="ident">is_empty</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">flags</span>), <span class="string">&quot;hi!&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{:?}&quot;</span>, <span class="ident">Flags</span>::<span class="ident">A</span> <span class="op">|</span> <span class="ident">Flags</span>::<span class="ident">B</span>), <span class="string">&quot;A | B&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{:?}&quot;</span>, <span class="ident">Flags</span>::<span class="ident">B</span>), <span class="string">&quot;B&quot;</span>);
}</pre></div>
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