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Trac3r-rust/doc/typenum/macro.cmp.html

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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 `cmp` macro in crate `typenum`."><meta name="keywords" content="rust, rustlang, rust-lang, cmp"><title>typenum::cmp - 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="../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 macro"><!--[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='../typenum/index.html'><div class='logo-container'><img src='../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class='location'><a href='index.html'>typenum</a></p><script>window.sidebarCurrent = {name: 'cmp', ty: 'macro', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></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 js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" 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"><h1 class='fqn'><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/typenum/type_operators.rs.html#458-500' title='goto source code'>[src]</a></span><span class='in-band'>Macro <a href='index.html'>typenum</a>::<wbr><a class="macro" href=''>cmp</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">cmp</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">ident</span> <span class="op">&lt;</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">b</span>:<span class="ident">ty</span>) <span class="op">=</span><span class="op">&gt;</span> { ... };
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">ty</span>, <span class="op">&lt;</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">b</span>:<span class="ident">ty</span>) <span class="op">=</span><span class="op">&gt;</span> { ... };
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">ident</span> <span class="op">=</span><span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">b</span>:<span class="ident">ty</span>) <span class="op">=</span><span class="op">&gt;</span> { ... };
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">ty</span>, <span class="op">=</span><span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">b</span>:<span class="ident">ty</span>) <span class="op">=</span><span class="op">&gt;</span> { ... };
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">ident</span> <span class="op">&gt;</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">b</span>:<span class="ident">ty</span>) <span class="op">=</span><span class="op">&gt;</span> { ... };
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">ty</span>, <span class="op">&gt;</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">b</span>:<span class="ident">ty</span>) <span class="op">=</span><span class="op">&gt;</span> { ... };
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">ident</span> <span class="op">&lt;</span><span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">b</span>:<span class="ident">ty</span>) <span class="op">=</span><span class="op">&gt;</span> { ... };
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">ty</span>, <span class="op">&lt;</span><span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">b</span>:<span class="ident">ty</span>) <span class="op">=</span><span class="op">&gt;</span> { ... };
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">ident</span> <span class="op">!</span><span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">b</span>:<span class="ident">ty</span>) <span class="op">=</span><span class="op">&gt;</span> { ... };
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">ty</span>, <span class="op">!</span><span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">b</span>:<span class="ident">ty</span>) <span class="op">=</span><span class="op">&gt;</span> { ... };
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">ident</span> <span class="op">&gt;</span><span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">b</span>:<span class="ident">ty</span>) <span class="op">=</span><span class="op">&gt;</span> { ... };
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">ty</span>, <span class="op">&gt;</span><span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">b</span>:<span class="ident">ty</span>) <span class="op">=</span><span class="op">&gt;</span> { ... };
}</pre></div>
</div><div class='stability'><div class='stab deprecated'>Deprecated since 1.9.0: <p>use the <code>op!</code> macro instead</p>
</div></div><div class='docblock'><p>A convenience macro for comparing type numbers. Use <code>op!</code> instead.</p>
<p>Due to the intricacies of the macro system, if the left-hand operand is more complex than a simple
<code>ident</code>, you must place a comma between it and the comparison sign.</p>
<p>For example, you can do <code>cmp!(P5 &gt; P3)</code> or <code>cmp!(typenum::P5, &gt; typenum::P3)</code> but not
<code>cmp!(typenum::P5 &gt; typenum::P3)</code>.</p>
<p>The result of this comparison will always be one of <code>True</code> (aka <code>B1</code>) or <code>False</code> (aka <code>B0</code>).</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">typenum</span>;
<span class="kw">use</span> <span class="ident">typenum</span>::<span class="ident">consts</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">typenum</span>::<span class="ident">Bit</span>;
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">type</span> <span class="prelude-ty">Result</span> <span class="op">=</span> <span class="macro">cmp</span><span class="macro">!</span>(<span class="ident">P9</span> <span class="op">=</span><span class="op">=</span> <span class="macro">op</span><span class="macro">!</span>(<span class="ident">P1</span> <span class="op">+</span> <span class="ident">P2</span> <span class="op">*</span> (<span class="ident">P2</span> <span class="op">-</span> <span class="ident">N2</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-ty">Result</span>::<span class="ident">to_bool</span>(), <span class="bool-val">true</span>);
}</pre></div>
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