| <!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/de/ignored_any.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>ignored_any.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="kw">use </span>lib::<span class="kw-2">*</span>; |
| |
| <span class="kw">use </span>de::{ |
| Deserialize, Deserializer, EnumAccess, Error, MapAccess, SeqAccess, VariantAccess, Visitor, |
| }; |
| |
| <span class="doccomment">/// An efficient way of discarding data from a deserializer. |
| /// |
| /// Think of this like `serde_json::Value` in that it can be deserialized from |
| /// any type, except that it does not store any information about the data that |
| /// gets deserialized. |
| /// |
| /// ```edition2018 |
| /// use std::fmt; |
| /// use std::marker::PhantomData; |
| /// |
| /// use serde::de::{ |
| /// self, Deserialize, DeserializeSeed, Deserializer, IgnoredAny, SeqAccess, Visitor, |
| /// }; |
| /// |
| /// /// A seed that can be used to deserialize only the `n`th element of a sequence |
| /// /// while efficiently discarding elements of any type before or after index `n`. |
| /// /// |
| /// /// For example to deserialize only the element at index 3: |
| /// /// |
| /// /// ``` |
| /// /// NthElement::new(3).deserialize(deserializer) |
| /// /// ``` |
| /// pub struct NthElement<T> { |
| /// n: usize, |
| /// marker: PhantomData<T>, |
| /// } |
| /// |
| /// impl<T> NthElement<T> { |
| /// pub fn new(n: usize) -> Self { |
| /// NthElement { |
| /// n: n, |
| /// marker: PhantomData, |
| /// } |
| /// } |
| /// } |
| /// |
| /// impl<'de, T> Visitor<'de> for NthElement<T> |
| /// where |
| /// T: Deserialize<'de>, |
| /// { |
| /// type Value = T; |
| /// |
| /// fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { |
| /// write!( |
| /// formatter, |
| /// "a sequence in which we care about element {}", |
| /// self.n |
| /// ) |
| /// } |
| /// |
| /// fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> |
| /// where |
| /// A: SeqAccess<'de>, |
| /// { |
| /// // Skip over the first `n` elements. |
| /// for i in 0..self.n { |
| /// // It is an error if the sequence ends before we get to element `n`. |
| /// if seq.next_element::<IgnoredAny>()?.is_none() { |
| /// return Err(de::Error::invalid_length(i, &self)); |
| /// } |
| /// } |
| /// |
| /// // Deserialize the one we care about. |
| /// let nth = match seq.next_element()? { |
| /// Some(nth) => nth, |
| /// None => { |
| /// return Err(de::Error::invalid_length(self.n, &self)); |
| /// } |
| /// }; |
| /// |
| /// // Skip over any remaining elements in the sequence after `n`. |
| /// while let Some(IgnoredAny) = seq.next_element()? { |
| /// // ignore |
| /// } |
| /// |
| /// Ok(nth) |
| /// } |
| /// } |
| /// |
| /// impl<'de, T> DeserializeSeed<'de> for NthElement<T> |
| /// where |
| /// T: Deserialize<'de>, |
| /// { |
| /// type Value = T; |
| /// |
| /// fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> |
| /// where |
| /// D: Deserializer<'de>, |
| /// { |
| /// deserializer.deserialize_seq(self) |
| /// } |
| /// } |
| /// |
| /// # fn example<'de, D>(deserializer: D) -> Result<(), D::Error> |
| /// # where |
| /// # D: Deserializer<'de>, |
| /// # { |
| /// // Deserialize only the sequence element at index 3 from this deserializer. |
| /// // The element at index 3 is required to be a string. Elements before and |
| /// // after index 3 are allowed to be of any type. |
| /// let s: String = NthElement::new(3).deserialize(deserializer)?; |
| /// # Ok(()) |
| /// # } |
| /// ``` |
| </span><span class="attribute">#[derive(Copy, Clone, Debug, Default)] |
| </span><span class="kw">pub struct </span>IgnoredAny; |
| |
| <span class="kw">impl</span><<span class="lifetime">'de</span>> Visitor<<span class="lifetime">'de</span>> <span class="kw">for </span>IgnoredAny { |
| <span class="kw">type </span>Value = IgnoredAny; |
| |
| <span class="kw">fn </span>expecting(<span class="kw-2">&</span><span class="self">self</span>, formatter: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| formatter.write_str(<span class="string">"anything at all"</span>) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>visit_bool<E>(<span class="self">self</span>, x: bool) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Value, E> { |
| <span class="kw">let _ </span>= x; |
| <span class="prelude-val">Ok</span>(IgnoredAny) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>visit_i64<E>(<span class="self">self</span>, x: i64) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Value, E> { |
| <span class="kw">let _ </span>= x; |
| <span class="prelude-val">Ok</span>(IgnoredAny) |
| } |
| |
| <span class="macro">serde_if_integer128! </span>{ |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>visit_i128<E>(<span class="self">self</span>, x: i128) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Value, E> { |
| <span class="kw">let _ </span>= x; |
| <span class="prelude-val">Ok</span>(IgnoredAny) |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>visit_u64<E>(<span class="self">self</span>, x: u64) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Value, E> { |
| <span class="kw">let _ </span>= x; |
| <span class="prelude-val">Ok</span>(IgnoredAny) |
| } |
| |
| <span class="macro">serde_if_integer128! </span>{ |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>visit_u128<E>(<span class="self">self</span>, x: u128) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Value, E> { |
| <span class="kw">let _ </span>= x; |
| <span class="prelude-val">Ok</span>(IgnoredAny) |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>visit_f64<E>(<span class="self">self</span>, x: f64) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Value, E> { |
| <span class="kw">let _ </span>= x; |
| <span class="prelude-val">Ok</span>(IgnoredAny) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>visit_str<E>(<span class="self">self</span>, s: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Value, E> |
| <span class="kw">where |
| </span>E: Error, |
| { |
| <span class="kw">let _ </span>= s; |
| <span class="prelude-val">Ok</span>(IgnoredAny) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>visit_none<E>(<span class="self">self</span>) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Value, E> { |
| <span class="prelude-val">Ok</span>(IgnoredAny) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>visit_some<D>(<span class="self">self</span>, deserializer: D) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Value, D::Error> |
| <span class="kw">where |
| </span>D: Deserializer<<span class="lifetime">'de</span>>, |
| { |
| IgnoredAny::deserialize(deserializer) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>visit_newtype_struct<D>(<span class="self">self</span>, deserializer: D) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Value, D::Error> |
| <span class="kw">where |
| </span>D: Deserializer<<span class="lifetime">'de</span>>, |
| { |
| IgnoredAny::deserialize(deserializer) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>visit_unit<E>(<span class="self">self</span>) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Value, E> { |
| <span class="prelude-val">Ok</span>(IgnoredAny) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>visit_seq<A>(<span class="self">self</span>, <span class="kw-2">mut </span>seq: A) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Value, A::Error> |
| <span class="kw">where |
| </span>A: SeqAccess<<span class="lifetime">'de</span>>, |
| { |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(IgnoredAny) = <span class="macro">try!</span>(seq.next_element()) { |
| <span class="comment">// Gobble |
| </span>} |
| <span class="prelude-val">Ok</span>(IgnoredAny) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>visit_map<A>(<span class="self">self</span>, <span class="kw-2">mut </span>map: A) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Value, A::Error> |
| <span class="kw">where |
| </span>A: MapAccess<<span class="lifetime">'de</span>>, |
| { |
| <span class="kw">while let </span><span class="prelude-val">Some</span>((IgnoredAny, IgnoredAny)) = <span class="macro">try!</span>(map.next_entry()) { |
| <span class="comment">// Gobble |
| </span>} |
| <span class="prelude-val">Ok</span>(IgnoredAny) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>visit_bytes<E>(<span class="self">self</span>, bytes: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Value, E> |
| <span class="kw">where |
| </span>E: Error, |
| { |
| <span class="kw">let _ </span>= bytes; |
| <span class="prelude-val">Ok</span>(IgnoredAny) |
| } |
| |
| <span class="kw">fn </span>visit_enum<A>(<span class="self">self</span>, data: A) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Value, A::Error> |
| <span class="kw">where |
| </span>A: EnumAccess<<span class="lifetime">'de</span>>, |
| { |
| <span class="macro">try!</span>(data.variant::<IgnoredAny>()).<span class="number">1</span>.newtype_variant() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'de</span>> Deserialize<<span class="lifetime">'de</span>> <span class="kw">for </span>IgnoredAny { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>deserialize<D>(deserializer: D) -> <span class="prelude-ty">Result</span><IgnoredAny, D::Error> |
| <span class="kw">where |
| </span>D: Deserializer<<span class="lifetime">'de</span>>, |
| { |
| deserializer.deserialize_ignored_any(IgnoredAny) |
| } |
| } |
| </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> |