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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 `serde_if_integer128` macro in crate `serde`."><meta name="keywords" content="rust, rustlang, rust-lang, serde_if_integer128"><title>serde::serde_if_integer128 - 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">☰</div><a href='../serde/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'>serde</a></p><script>window.sidebarCurrent = {name: 'serde_if_integer128', 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'>−</span>]</a></span><a class='srclink' href='../src/serde/integer128.rs.html#71-75' title='goto source code'>[src]</a></span><span class='in-band'>Macro <a href='index.html'>serde</a>::<wbr><a class="macro" href=''>serde_if_integer128</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><div class="example-wrap"><pre class="rust macro">
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<span class="macro">macro_rules</span><span class="macro">!</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>) <span class="op">=</span><span class="op">></span> { ... };
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}</pre></div>
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</div><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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<pre><code class="language-edition2018"># use serde::private::ser::Error;
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#
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# struct MySerializer;
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#
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use serde::{serde_if_integer128, Serializer};
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impl Serializer for MySerializer {
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type Ok = ();
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type Error = Error;
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fn serialize_i64(self, v: i64) -> Result<Self::Ok, Self::Error> {
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/* ... */
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# unimplemented!()
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}
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/* ... */
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serde_if_integer128! {
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fn serialize_i128(self, v: i128) -> Result<Self::Ok, Self::Error> {
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/* ... */
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# unimplemented!()
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}
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fn serialize_u128(self, v: u128) -> Result<Self::Ok, Self::Error> {
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/* ... */
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# unimplemented!()
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}
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}
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#
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# serde::__serialize_unimplemented! {
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# bool i8 i16 i32 u8 u16 u32 u64 f32 f64 char str bytes none some
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# unit unit_struct unit_variant newtype_struct newtype_variant seq
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# tuple tuple_struct tuple_variant map struct struct_variant
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# }
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}
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</code></pre>
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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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<pre><code class="language-edition2018">macro_rules! serde_if_integer128 {
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($($tt:tt)*) => {
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$($tt)*
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};
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}
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</code></pre>
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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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<pre><code class="language-edition2018">macro_rules! serde_if_integer128 {
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($($tt:tt)*) => {};
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}
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</code></pre>
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