| <!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="Helper macro when implementing the `Deserializer` part of a new data format for Serde."><meta name="keywords" content="rust, rustlang, rust-lang, forward_to_deserialize_any"><title>forward_to_deserialize_any 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" href="../normalize.css"><link rel="stylesheet" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../ayu.css" disabled><link rel="stylesheet" href="../dark.css" disabled><link rel="stylesheet" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../main.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../favicon.svg"></head><body class="rustdoc macro"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../serde/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><h2></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../serde/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2><a href="index.html">In serde</a></h2></div></nav><main><div class="width-limiter"><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn">Macro <a href="index.html">serde</a>::<wbr><a class="macro" href="#">forward_to_deserialize_any</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></h1><span class="out-of-band"><a class="srclink" href="../src/serde/macros.rs.html#112-120">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="item-decl"><div class="example-wrap"><pre class="rust macro"><code><span class="macro">macro_rules! </span>forward_to_deserialize_any { |
| (<<span class="macro-nonterminal">$visitor</span>:ident: Visitor<<span class="macro-nonterminal">$lifetime</span>:tt>> $(<span class="macro-nonterminal">$func</span>:ident)<span class="kw-2">*</span>) => { ... }; |
| ($(<span class="macro-nonterminal">$func</span>:ident)<span class="kw-2">*</span>) => { ... }; |
| }</code></pre></div> |
| </div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Helper macro when implementing the <code>Deserializer</code> part of a new data format |
| for Serde.</p> |
| <p>Some <a href="trait.Deserializer.html"><code>Deserializer</code></a> implementations for self-describing formats do not |
| care what hint the <a href="de/trait.Visitor.html"><code>Visitor</code></a> gives them, they just want to blindly call |
| the <a href="de/trait.Visitor.html"><code>Visitor</code></a> method corresponding to the data they can tell is in the |
| input. This requires repetitive implementations of all the <a href="trait.Deserializer.html"><code>Deserializer</code></a> |
| trait methods.</p> |
| |
| <div class="example-wrap edition"><div class='tooltip' data-edition="2018">ⓘ</div><pre class="rust rust-example-rendered"><code><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>deserialize_bool<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value, <span class="self">Self</span>::Error> |
| <span class="kw">where |
| </span>V: Visitor<<span class="lifetime">'de</span>>, |
| { |
| <span class="self">self</span>.deserialize_any(visitor) |
| }</code></pre></div> |
| <p>The <code>forward_to_deserialize_any!</code> macro implements these simple forwarding |
| methods so that they forward directly to <a href="trait.Deserializer.html#tymethod.deserialize_any"><code>Deserializer::deserialize_any</code></a>. |
| You can choose which methods to forward.</p> |
| |
| <div class="example-wrap edition"><div class='tooltip' data-edition="2018">ⓘ</div><pre class="rust rust-example-rendered"><code><span class="kw">impl</span><<span class="lifetime">'de</span>> Deserializer<<span class="lifetime">'de</span>> <span class="kw">for </span>MyDeserializer { |
| <span class="kw">fn </span>deserialize_any<V>(<span class="self">self</span>, visitor: V) -> <span class="prelude-ty">Result</span><V::Value, <span class="self">Self</span>::Error> |
| <span class="kw">where |
| </span>V: Visitor<<span class="lifetime">'de</span>>, |
| { |
| <span class="comment">/* ... */ |
| </span>} |
| |
| <span class="macro">forward_to_deserialize_any! </span>{ |
| bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string |
| bytes byte_buf option unit unit_struct newtype_struct seq tuple |
| tuple_struct map <span class="kw">struct enum </span>identifier ignored_any |
| } |
| }</code></pre></div> |
| <p>The macro assumes the convention that your <code>Deserializer</code> lifetime parameter |
| is called <code>'de</code> and that the <code>Visitor</code> type parameters on each method are |
| called <code>V</code>. A different type parameter and a different lifetime can be |
| specified explicitly if necessary.</p> |
| |
| <div class="example-wrap edition"><div class='tooltip' data-edition="2018">ⓘ</div><pre class="rust rust-example-rendered"><code><span class="macro">forward_to_deserialize_any! </span>{ |
| <W: Visitor<<span class="lifetime">'q</span>>> |
| bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string |
| bytes byte_buf option unit unit_struct newtype_struct seq tuple |
| tuple_struct map <span class="kw">struct enum </span>identifier ignored_any |
| }</code></pre></div> |
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