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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 `forward_to_deserialize_any` macro in crate `serde`."><meta name="keywords" content="rust, rustlang, rust-lang, forward_to_deserialize_any"><title>serde::forward_to_deserialize_any - 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: 'forward_to_deserialize_any', 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/macros.rs.html#112-120' title='goto source code'>[src]</a></span><span class='in-band'>Macro <a href='index.html'>serde</a>::<wbr><a class="macro" href=''>forward_to_deserialize_any</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">forward_to_deserialize_any</span> {
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(<span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">visitor</span>:<span class="ident">ident</span>: <span class="ident">Visitor</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">lifetime</span>:<span class="ident">tt</span><span class="op">></span><span class="op">></span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">func</span>:<span class="ident">ident</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { ... };
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($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">func</span>:<span class="ident">ident</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>Helper macro when implementing the <code>Deserializer</code> part of a new data format
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for Serde.</p>
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<p>Some <a href="trait.Deserializer.html"><code>Deserializer</code></a> implementations for self-describing formats do not
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care what hint the <a href="de/trait.Visitor.html"><code>Visitor</code></a> gives them, they just want to blindly call
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the <a href="de/trait.Visitor.html"><code>Visitor</code></a> method corresponding to the data they can tell is in the
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input. This requires repetitive implementations of all the <a href="trait.Deserializer.html"><code>Deserializer</code></a>
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trait methods.</p>
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<pre><code class="language-edition2018"># use serde::forward_to_deserialize_any;
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# use serde::de::{value, Deserializer, Visitor};
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#
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# struct MyDeserializer;
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#
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# impl<'de> Deserializer<'de> for MyDeserializer {
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# type Error = value::Error;
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#
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# fn deserialize_any<V>(self, _: V) -> Result<V::Value, Self::Error>
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# where
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# V: Visitor<'de>,
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# {
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# unimplemented!()
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# }
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#
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#[inline]
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fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Self::Error>
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where
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V: Visitor<'de>,
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{
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self.deserialize_any(visitor)
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}
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#
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# forward_to_deserialize_any! {
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# i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
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# bytes byte_buf option unit unit_struct newtype_struct seq tuple
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# tuple_struct map struct enum identifier ignored_any
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# }
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# }
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</code></pre>
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<p>The <code>forward_to_deserialize_any!</code> macro implements these simple forwarding
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methods so that they forward directly to <a href="trait.Deserializer.html#tymethod.deserialize_any"><code>Deserializer::deserialize_any</code></a>.
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You can choose which methods to forward.</p>
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<pre><code class="language-edition2018"># use serde::forward_to_deserialize_any;
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# use serde::de::{value, Deserializer, Visitor};
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#
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# struct MyDeserializer;
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#
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impl<'de> Deserializer<'de> for MyDeserializer {
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# type Error = value::Error;
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#
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fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
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where
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V: Visitor<'de>,
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{
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/* ... */
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# let _ = visitor;
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# unimplemented!()
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}
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forward_to_deserialize_any! {
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bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
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bytes byte_buf option unit unit_struct newtype_struct seq tuple
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tuple_struct map struct enum identifier ignored_any
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}
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}
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</code></pre>
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<p>The macro assumes the convention that your <code>Deserializer</code> lifetime parameter
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is called <code>'de</code> and that the <code>Visitor</code> type parameters on each method are
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called <code>V</code>. A different type parameter and a different lifetime can be
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specified explicitly if necessary.</p>
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<pre><code class="language-edition2018"># use std::marker::PhantomData;
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#
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# use serde::forward_to_deserialize_any;
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# use serde::de::{value, Deserializer, Visitor};
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#
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# struct MyDeserializer<V>(PhantomData<V>);
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#
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# impl<'q, V> Deserializer<'q> for MyDeserializer<V> {
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# type Error = value::Error;
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#
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# fn deserialize_any<W>(self, visitor: W) -> Result<W::Value, Self::Error>
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# where
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# W: Visitor<'q>,
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# {
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# unimplemented!()
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# }
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#
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forward_to_deserialize_any! {
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<W: Visitor<'q>>
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bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
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bytes byte_buf option unit unit_struct newtype_struct seq tuple
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tuple_struct map struct enum identifier ignored_any
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}
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# }
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</code></pre>
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