| <!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="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/serde-1.0.163/src/macros.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>macros.rs - source</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="../../source-script.js"></script><script defer src="../../source-files.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 source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><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></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../serde/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><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="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="comment">// Super explicit first paragraph because this shows up at the top level and |
| // trips up people who are just looking for basic Serialize / Deserialize |
| // documentation. |
| // |
| </span><span class="doccomment">/// Helper macro when implementing the `Deserializer` part of a new data format |
| /// for Serde. |
| /// |
| /// Some [`Deserializer`] implementations for self-describing formats do not |
| /// care what hint the [`Visitor`] gives them, they just want to blindly call |
| /// the [`Visitor`] method corresponding to the data they can tell is in the |
| /// input. This requires repetitive implementations of all the [`Deserializer`] |
| /// trait methods. |
| /// |
| /// ```edition2018 |
| /// # use serde::forward_to_deserialize_any; |
| /// # use serde::de::{value, Deserializer, Visitor}; |
| /// # |
| /// # struct MyDeserializer; |
| /// # |
| /// # impl<'de> Deserializer<'de> for MyDeserializer { |
| /// # type Error = value::Error; |
| /// # |
| /// # fn deserialize_any<V>(self, _: V) -> Result<V::Value, Self::Error> |
| /// # where |
| /// # V: Visitor<'de>, |
| /// # { |
| /// # unimplemented!() |
| /// # } |
| /// # |
| /// #[inline] |
| /// fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Self::Error> |
| /// where |
| /// V: Visitor<'de>, |
| /// { |
| /// self.deserialize_any(visitor) |
| /// } |
| /// # |
| /// # forward_to_deserialize_any! { |
| /// # 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 struct enum identifier ignored_any |
| /// # } |
| /// # } |
| /// ``` |
| /// |
| /// The `forward_to_deserialize_any!` macro implements these simple forwarding |
| /// methods so that they forward directly to [`Deserializer::deserialize_any`]. |
| /// You can choose which methods to forward. |
| /// |
| /// ```edition2018 |
| /// # use serde::forward_to_deserialize_any; |
| /// # use serde::de::{value, Deserializer, Visitor}; |
| /// # |
| /// # struct MyDeserializer; |
| /// # |
| /// impl<'de> Deserializer<'de> for MyDeserializer { |
| /// # type Error = value::Error; |
| /// # |
| /// fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> |
| /// where |
| /// V: Visitor<'de>, |
| /// { |
| /// /* ... */ |
| /// # let _ = visitor; |
| /// # unimplemented!() |
| /// } |
| /// |
| /// forward_to_deserialize_any! { |
| /// 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 struct enum identifier ignored_any |
| /// } |
| /// } |
| /// ``` |
| /// |
| /// The macro assumes the convention that your `Deserializer` lifetime parameter |
| /// is called `'de` and that the `Visitor` type parameters on each method are |
| /// called `V`. A different type parameter and a different lifetime can be |
| /// specified explicitly if necessary. |
| /// |
| /// ```edition2018 |
| /// # use std::marker::PhantomData; |
| /// # |
| /// # use serde::forward_to_deserialize_any; |
| /// # use serde::de::{value, Deserializer, Visitor}; |
| /// # |
| /// # struct MyDeserializer<V>(PhantomData<V>); |
| /// # |
| /// # impl<'q, V> Deserializer<'q> for MyDeserializer<V> { |
| /// # type Error = value::Error; |
| /// # |
| /// # fn deserialize_any<W>(self, visitor: W) -> Result<W::Value, Self::Error> |
| /// # where |
| /// # W: Visitor<'q>, |
| /// # { |
| /// # unimplemented!() |
| /// # } |
| /// # |
| /// forward_to_deserialize_any! { |
| /// <W: Visitor<'q>> |
| /// 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 struct enum identifier ignored_any |
| /// } |
| /// # } |
| /// ``` |
| /// |
| /// [`Deserializer`]: trait.Deserializer.html |
| /// [`Visitor`]: de/trait.Visitor.html |
| /// [`Deserializer::deserialize_any`]: trait.Deserializer.html#tymethod.deserialize_any |
| </span><span class="attribute">#[macro_export(local_inner_macros)] |
| </span><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>) => { |
| $(<span class="macro">forward_to_deserialize_any_helper!</span>{<span class="macro-nonterminal">$func</span><<span class="macro-nonterminal">$lifetime</span>, <span class="macro-nonterminal">$visitor</span>>})* |
| }; |
| <span class="comment">// This case must be after the previous one. |
| </span>($(<span class="macro-nonterminal">$func</span>:ident)<span class="kw-2">*</span>) => { |
| $(<span class="macro">forward_to_deserialize_any_helper!</span>{<span class="macro-nonterminal">$func</span><<span class="lifetime">'de</span>, V>})* |
| }; |
| } |
| |
| <span class="attribute">#[doc(hidden)] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>forward_to_deserialize_any_method { |
| (<span class="macro-nonterminal">$func</span>:ident<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>($(<span class="macro-nonterminal">$arg</span>:ident : <span class="macro-nonterminal">$ty</span>:ty),<span class="kw-2">*</span>)) => { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span><span class="macro-nonterminal">$func</span><<span class="macro-nonterminal">$v</span>>(<span class="self">self</span>, $(<span class="macro-nonterminal">$arg</span>: <span class="macro-nonterminal">$ty</span>,)* visitor: <span class="macro-nonterminal">$v</span>) -> <span class="macro-nonterminal">$crate::__private::Result</span><<span class="macro-nonterminal">$v::Value</span>, <span class="self">Self</span>::Error> |
| <span class="kw">where |
| </span><span class="macro-nonterminal">$v</span>: <span class="macro-nonterminal">$crate::de::Visitor</span><<span class="macro-nonterminal">$l</span>>, |
| { |
| $( |
| <span class="kw">let _ </span>= <span class="macro-nonterminal">$arg</span>; |
| )* |
| <span class="self">self</span>.deserialize_any(visitor) |
| } |
| }; |
| } |
| |
| <span class="attribute">#[doc(hidden)] |
| #[macro_export(local_inner_macros)] |
| </span><span class="macro">macro_rules! </span>forward_to_deserialize_any_helper { |
| (bool<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_bool<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (i8<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_i8<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (i16<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_i16<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (i32<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_i32<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (i64<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_i64<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (i128<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">serde_if_integer128! </span>{ |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_i128<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| } |
| }; |
| (u8<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_u8<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (u16<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_u16<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (u32<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_u32<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (u64<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_u64<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (u128<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">serde_if_integer128! </span>{ |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_u128<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| } |
| }; |
| (f32<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_f32<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (f64<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_f64<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (char<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_char<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (str<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_str<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (string<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_string<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (bytes<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_bytes<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (byte_buf<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_byte_buf<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (option<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_option<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (unit<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_unit<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (unit_struct<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_unit_struct<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>(name: <span class="kw-2">&</span><span class="lifetime">'static </span>str)} |
| }; |
| (newtype_struct<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_newtype_struct<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>(name: <span class="kw-2">&</span><span class="lifetime">'static </span>str)} |
| }; |
| (seq<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_seq<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (tuple<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_tuple<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>(len: usize)} |
| }; |
| (tuple_struct<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_tuple_struct<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>(name: <span class="kw-2">&</span><span class="lifetime">'static </span>str, len: usize)} |
| }; |
| (map<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_map<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (<span class="kw">struct</span><<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_struct<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>(name: <span class="kw-2">&</span><span class="lifetime">'static </span>str, fields: <span class="kw-2">&</span><span class="lifetime">'static </span>[<span class="kw-2">&</span><span class="lifetime">'static </span>str])} |
| }; |
| (<span class="kw">enum</span><<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_enum<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>(name: <span class="kw-2">&</span><span class="lifetime">'static </span>str, variants: <span class="kw-2">&</span><span class="lifetime">'static </span>[<span class="kw-2">&</span><span class="lifetime">'static </span>str])} |
| }; |
| (identifier<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_identifier<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| (ignored_any<<span class="macro-nonterminal">$l</span>:tt, <span class="macro-nonterminal">$v</span>:ident>) => { |
| <span class="macro">forward_to_deserialize_any_method!</span>{deserialize_ignored_any<<span class="macro-nonterminal">$l</span>, <span class="macro-nonterminal">$v</span>>()} |
| }; |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="serde" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
