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52 lines
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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="Conditional compilation depending on whether Serde is built with support for 128-bit integers."><meta name="keywords" content="rust, rustlang, rust-lang, serde_if_integer128"><title>serde_if_integer128 in serde - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><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="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script src="../crates.js"></script><script defer src="../main.js"></script>
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</a><div class="sidebar-elems"><h2 class="location">Other items in<br><a href="index.html">serde</a></h2><div id="sidebar-vars" data-name="serde_if_integer128" data-ty="macro" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../serde/index.html"><img class="rust-logo" src="../rust-logo.png" alt="logo"></a><nav class="sub"><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../brush.svg"></button><div id="theme-choices" role="menu"></div></div><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" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../wheel.svg"></a></div></form></nav></div><section id="main-content" class="content"><h1 class="fqn"><span class="in-band">Macro <a href="index.html">serde</a>::<wbr><a class="macro" href="#">serde_if_integer128</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></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">−</span>]</a></span><a class="srclink" href="../src/serde/integer128.rs.html#71-75" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><div class="example-wrap"><pre class="rust macro"><code><span class="macro">macro_rules!</span> <span class="ident">serde_if_integer128</span> {
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($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span> : <span class="ident">tt</span>) <span class="kw-2">*</span>) => { ... };
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}</code></pre></div>
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</div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Conditional compilation depending on whether Serde is built with support for
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128-bit integers.</p>
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<p>Data formats that wish to support Rust compiler versions older than 1.26
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(or targets that lack 128-bit integers) may place the i128 / u128 methods
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of their Serializer and Deserializer behind this macro.</p>
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<p>Data formats that require a minimum Rust compiler version of at least 1.26,
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or do not target platforms that lack 128-bit integers, do not need to
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bother with this macro and may assume support for 128-bit integers.</p>
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<div class='information'><div class='tooltip edition' data-edition="2018">ⓘ</div></div><div class="example-wrap"><pre class="rust rust-example-rendered edition"><code><span class="kw">use</span> <span class="ident">serde</span>::{<span class="ident">serde_if_integer128</span>, <span class="ident">Serializer</span>};
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<span class="kw">impl</span> <span class="ident">Serializer</span> <span class="kw">for</span> <span class="ident">MySerializer</span> {
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<span class="kw">type</span> <span class="prelude-val">Ok</span> <span class="op">=</span> ();
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<span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">Error</span>;
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<span class="kw">fn</span> <span class="ident">serialize_i64</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">i64</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident"><span class="self">Self</span>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">></span> {
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<span class="comment">/* ... */</span>
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}
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<span class="comment">/* ... */</span>
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<span class="macro">serde_if_integer128!</span> {
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<span class="kw">fn</span> <span class="ident">serialize_i128</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">i128</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident"><span class="self">Self</span>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">></span> {
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<span class="comment">/* ... */</span>
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}
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<span class="kw">fn</span> <span class="ident">serialize_u128</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">u128</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident"><span class="self">Self</span>::Ok</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">></span> {
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<span class="comment">/* ... */</span>
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}
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}
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}</code></pre></div>
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<p>When Serde is built with support for 128-bit integers, this macro expands
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transparently into just the input tokens.</p>
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<div class='information'><div class='tooltip edition' data-edition="2018">ⓘ</div></div><div class="example-wrap"><pre class="rust rust-example-rendered edition"><code><span class="macro">macro_rules!</span> <span class="ident">serde_if_integer128</span> {
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($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) => {
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$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span>)<span class="op">*</span>
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};
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}</code></pre></div>
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<p>When built without support for 128-bit integers, this macro expands to
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nothing.</p>
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<div class='information'><div class='tooltip edition' data-edition="2018">ⓘ</div></div><div class="example-wrap"><pre class="rust rust-example-rendered edition"><code><span class="macro">macro_rules!</span> <span class="ident">serde_if_integer128</span> {
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($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) => {};
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}</code></pre></div>
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