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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="../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">serde</a>::<wbr><a class="macro" href="">serde_if_integer128</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/serde/integer128.rs.html#71-75" 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">serde_if_integer128</span> {
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">&gt;</span> { ... };
}</pre></div>
</div><div class="docblock"><p>Conditional compilation depending on whether Serde is built with support for
128-bit integers.</p>
<p>Data formats that wish to support Rust compiler versions older than 1.26
(or targets that lack 128-bit integers) may place the i128 / u128 methods
of their Serializer and Deserializer behind this macro.</p>
<p>Data formats that require a minimum Rust compiler version of at least 1.26,
or do not target platforms that lack 128-bit integers, do not need to
bother with this macro and may assume support for 128-bit integers.</p>
<div class='information'><div class='tooltip edition' data-edition="2018">ⓘ</div></div><div class="example-wrap"><pre class="rust rust-example-rendered edition">
<span class="kw">use</span> <span class="ident">serde</span>::{<span class="ident">serde_if_integer128</span>, <span class="ident">Serializer</span>};
<span class="kw">impl</span> <span class="ident">Serializer</span> <span class="kw">for</span> <span class="ident">MySerializer</span> {
<span class="kw">type</span> <span class="prelude-val">Ok</span> <span class="op">=</span> ();
<span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">Error</span>;
<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="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="self">Self</span>::<span class="prelude-val">Ok</span>, <span class="self">Self</span>::<span class="ident">Error</span><span class="op">&gt;</span> {
<span class="comment">/* ... */</span>
}
<span class="comment">/* ... */</span>
<span class="macro">serde_if_integer128</span><span class="macro">!</span> {
<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="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="self">Self</span>::<span class="prelude-val">Ok</span>, <span class="self">Self</span>::<span class="ident">Error</span><span class="op">&gt;</span> {
<span class="comment">/* ... */</span>
}
<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="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="self">Self</span>::<span class="prelude-val">Ok</span>, <span class="self">Self</span>::<span class="ident">Error</span><span class="op">&gt;</span> {
<span class="comment">/* ... */</span>
}
}
}</pre></div>
<p>When Serde is built with support for 128-bit integers, this macro expands
transparently into just the input tokens.</p>
<div class='information'><div class='tooltip edition' data-edition="2018">ⓘ</div></div><div class="example-wrap"><pre class="rust rust-example-rendered edition">
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">serde_if_integer128</span> {
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">&gt;</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span>)<span class="op">*</span>
};
}</pre></div>
<p>When built without support for 128-bit integers, this macro expands to
nothing.</p>
<div class='information'><div class='tooltip edition' data-edition="2018">ⓘ</div></div><div class="example-wrap"><pre class="rust rust-example-rendered edition">
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">serde_if_integer128</span> {
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">&gt;</span> {};
}</pre></div>
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