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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 `Decoder` trait in crate `rustc_serialize`."><meta name="keywords" content="rust, rustlang, rust-lang, Decoder"><title>rustc_serialize::Decoder - 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="https://www.rust-lang.org/favicon.ico"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc trait"><!--[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='../rustc_serialize/index.html'><div class='logo-container'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo'></div></a><p class='location'>Trait Decoder</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#associated-types">Associated Types</a><div class="sidebar-links"><a href="#associatedtype.Error">Error</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.error">error</a><a href="#tymethod.read_bool">read_bool</a><a href="#tymethod.read_char">read_char</a><a href="#tymethod.read_enum">read_enum</a><a href="#tymethod.read_enum_struct_variant">read_enum_struct_variant</a><a href="#tymethod.read_enum_struct_variant_field">read_enum_struct_variant_field</a><a href="#tymethod.read_enum_variant">read_enum_variant</a><a href="#tymethod.read_enum_variant_arg">read_enum_variant_arg</a><a href="#tymethod.read_f32">read_f32</a><a href="#tymethod.read_f64">read_f64</a><a href="#tymethod.read_i16">read_i16</a><a href="#tymethod.read_i32">read_i32</a><a href="#tymethod.read_i64">read_i64</a><a href="#tymethod.read_i8">read_i8</a><a href="#tymethod.read_isize">read_isize</a><a href="#tymethod.read_map">read_map</a><a href="#tymethod.read_map_elt_key">read_map_elt_key</a><a href="#tymethod.read_map_elt_val">read_map_elt_val</a><a href="#tymethod.read_nil">read_nil</a><a href="#tymethod.read_option">read_option</a><a href="#tymethod.read_seq">read_seq</a><a href="#tymethod.read_seq_elt">read_seq_elt</a><a href="#tymethod.read_str">read_str</a><a href="#tymethod.read_struct">read_struct</a><a href="#tymethod.read_struct_field">read_struct_field</a><a href="#tymethod.read_tuple">read_tuple</a><a href="#tymethod.read_tuple_arg">read_tuple_arg</a><a href="#tymethod.read_tuple_struct">read_tuple_struct</a><a href="#tymethod.read_tuple_struct_arg">read_tuple_struct_arg</a><a href="#tymethod.read_u16">read_u16</a><a href="#tymethod.read_u32">read_u32</a><a href="#tymethod.read_u64">read_u64</a><a href="#tymethod.read_u8">read_u8</a><a href="#tymethod.read_usize">read_usize</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='index.html'>rustc_serialize</a></p><script>window.sidebarCurrent = {name: 'Decoder', ty: 'trait', 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 sear
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type <a href='#associatedtype.Error' class="type">Error</a>;
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fn <a href='#tymethod.read_nil' class='fnname'>read_nil</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_usize' class='fnname'>read_usize</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_u64' class='fnname'>read_u64</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_u32' class='fnname'>read_u32</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_u16' class='fnname'>read_u16</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u16.html">u16</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_u8' class='fnname'>read_u8</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_isize' class='fnname'>read_isize</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.isize.html">isize</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_i64' class='fnname'>read_i64</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i64.html">i64</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_i32' class='fnname'>read_i32</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_i16' class='fnname'>read_i16</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i16.html">i16</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_i8' class='fnname'>read_i8</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i8.html">i8</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_bool' class='fnname'>read_bool</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_f64' class='fnname'>read_f64</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f64.html">f64</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_f32' class='fnname'>read_f32</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f32.html">f32</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_char' class='fnname'>read_char</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.char.html">char</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_str' class='fnname'>read_str</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_enum' class='fnname'>read_enum</a><T, F>(&mut self, name: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></span>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_enum_variant' class='fnname'>read_enum_variant</a><T, F>(<br> &mut self, <br> names: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&[</a>&<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>, <br> f: F<br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></span>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_enum_variant_arg' class='fnname'>read_enum_variant_arg</a><T, F>(<br> &mut self, <br> a_idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> f: F<br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></span>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_enum_struct_variant' class='fnname'>read_enum_struct_variant</a><T, F>(<br> &mut self, <br> names: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&[</a>&<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>, <br> f: F<br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></span>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_enum_struct_variant_field' class='fnname'>read_enum_struct_variant_field</a><T, F>(<br> &mut self, <br> f_name: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, <br> f_idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> f: F<br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></span>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_struct' class='fnname'>read_struct</a><T, F>(<br> &mut self, <br> s_name: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, <br> len: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> f: F<br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></span>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_struct_field' class='fnname'>read_struct_field</a><T, F>(<br> &mut self, <br> f_name: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, <br> f_idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> f: F<br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></span>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_tuple' class='fnname'>read_tuple</a><T, F>(&mut self, len: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></span>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_tuple_arg' class='fnname'>read_tuple_arg</a><T, F>(<br> &mut self, <br> a_idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> f: F<br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></span>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_tuple_struct' class='fnname'>read_tuple_struct</a><T, F>(<br> &mut self, <br> s_name: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, <br> len: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> f: F<br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></span>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_tuple_struct_arg' class='fnname'>read_tuple_struct_arg</a><T, F>(<br> &mut self, <br> a_idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> f: F<br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></span>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_option' class='fnname'>read_option</a><T, F>(&mut self, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></span>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_seq' class='fnname'>read_seq</a><T, F>(&mut self, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></span>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_seq_elt' class='fnname'>read_seq_elt</a><T, F>(&mut self, idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></span>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_map' class='fnname'>read_map</a><T, F>(&mut self, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></span>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_map_elt_key' class='fnname'>read_map_elt_key</a><T, F>(<br> &mut self, <br> idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> f: F<br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></span>;
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<div class='item-spacer'></div> fn <a href='#tymethod.read_map_elt_val' class='fnname'>read_map_elt_val</a><T, F>(<br> &mut self, <br> idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> f: F<br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></span>;
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<div class='item-spacer'></div> fn <a href='#tymethod.error' class='fnname'>error</a>(&mut self, err: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -> Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>;
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}</pre></div><div class='docblock'><p>Trait for reading in an encoding for deserialization.</p>
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<p>This trait provides methods to decode basic types and generic forms of
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collections. Implementations of <code>Decodable</code> use it to perform the actual
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decoding of a type.</p>
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<p>Note that, as is typical with deserialization, the design of this API
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assumes you know in advance the form of the data you are decoding (ie: what
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type is encoded).</p>
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<p>Decoders can expect to only have a single "root" method call made on this
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trait. Non-trivial types will call one of the collection-reading methods,
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passing a function that may call other methods on the trait, but once the
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collection-reading method has returned, decoding should be complete.</p>
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</div>
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<h2 id='associated-types' class='small-section-header'>Associated Types<a href='#associated-types' class='anchor'></a></h2><div class='methods'><h3 id='associatedtype.Error' class='method'><code id='Error.t'>type <a href='#associatedtype.Error' class="type">Error</a></code></h3><div class='docblock'><p>The error type for method results.</p>
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</div></div><span class='loading-content'>Loading content...</span>
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<h2 id='required-methods' class='small-section-header'>Required methods<a href='#required-methods' class='anchor'></a></h2><div class='methods'><h3 id='tymethod.read_nil' class='method'><code id='read_nil.v'>fn <a href='#tymethod.read_nil' class='fnname'>read_nil</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></code></h3><div class='docblock'><p>Read a nil value.</p>
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</div><h3 id='tymethod.read_usize' class='method'><code id='read_usize.v'>fn <a href='#tymethod.read_usize' class='fnname'>read_usize</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></code></h3><div class='docblock'><p>Read a usize value.</p>
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</div><h3 id='tymethod.read_u64' class='method'><code id='read_u64.v'>fn <a href='#tymethod.read_u64' class='fnname'>read_u64</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></code></h3><div class='docblock'><p>Read a u64 value.</p>
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</div><h3 id='tymethod.read_u32' class='method'><code id='read_u32.v'>fn <a href='#tymethod.read_u32' class='fnname'>read_u32</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></code></h3><div class='docblock'><p>Read a u32 value.</p>
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</div><h3 id='tymethod.read_u16' class='method'><code id='read_u16.v'>fn <a href='#tymethod.read_u16' class='fnname'>read_u16</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u16.html">u16</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></code></h3><div class='docblock'><p>Read a u16 value.</p>
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</div><h3 id='tymethod.read_u8' class='method'><code id='read_u8.v'>fn <a href='#tymethod.read_u8' class='fnname'>read_u8</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></code></h3><div class='docblock'><p>Read a u8 value.</p>
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</div><h3 id='tymethod.read_isize' class='method'><code id='read_isize.v'>fn <a href='#tymethod.read_isize' class='fnname'>read_isize</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.isize.html">isize</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></code></h3><div class='docblock'><p>Read a isize value.</p>
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</div><h3 id='tymethod.read_i64' class='method'><code id='read_i64.v'>fn <a href='#tymethod.read_i64' class='fnname'>read_i64</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i64.html">i64</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></code></h3><div class='docblock'><p>Read a i64 value.</p>
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</div><h3 id='tymethod.read_i32' class='method'><code id='read_i32.v'>fn <a href='#tymethod.read_i32' class='fnname'>read_i32</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></code></h3><div class='docblock'><p>Read a i32 value.</p>
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</div><h3 id='tymethod.read_i16' class='method'><code id='read_i16.v'>fn <a href='#tymethod.read_i16' class='fnname'>read_i16</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i16.html">i16</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></code></h3><div class='docblock'><p>Read a i16 value.</p>
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</div><h3 id='tymethod.read_i8' class='method'><code id='read_i8.v'>fn <a href='#tymethod.read_i8' class='fnname'>read_i8</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i8.html">i8</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></code></h3><div class='docblock'><p>Read a i8 value.</p>
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</div><h3 id='tymethod.read_bool' class='method'><code id='read_bool.v'>fn <a href='#tymethod.read_bool' class='fnname'>read_bool</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></code></h3><div class='docblock'><p>Read a bool value.</p>
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</div><h3 id='tymethod.read_f64' class='method'><code id='read_f64.v'>fn <a href='#tymethod.read_f64' class='fnname'>read_f64</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f64.html">f64</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></code></h3><div class='docblock'><p>Read a f64 value.</p>
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</div><h3 id='tymethod.read_f32' class='method'><code id='read_f32.v'>fn <a href='#tymethod.read_f32' class='fnname'>read_f32</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f32.html">f32</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></code></h3><div class='docblock'><p>Read a f32 value.</p>
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</div><h3 id='tymethod.read_char' class='method'><code id='read_char.v'>fn <a href='#tymethod.read_char' class='fnname'>read_char</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.char.html">char</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></code></h3><div class='docblock'><p>Read a char value.</p>
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</div><h3 id='tymethod.read_str' class='method'><code id='read_str.v'>fn <a href='#tymethod.read_str' class='fnname'>read_str</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>></code></h3><div class='docblock'><p>Read a string value.</p>
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</div><h3 id='tymethod.read_enum' class='method'><code id='read_enum.v'>fn <a href='#tymethod.read_enum' class='fnname'>read_enum</a><T, F>(&mut self, name: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>, </span></code></h3><div class='docblock'><p>Read an enumeration value.</p>
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<ul>
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<li><code>name</code> indicates the enumeration type name. It may be used to
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sanity-check the data being read.</li>
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<li><code>f</code> is a function that will call <code>read_enum_variant</code> (or
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<code>read_enum_struct_variant</code>) to read the actual value.</li>
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</ul>
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</div><h3 id='tymethod.read_enum_variant' class='method'><code id='read_enum_variant.v'>fn <a href='#tymethod.read_enum_variant' class='fnname'>read_enum_variant</a><T, F>(<br> &mut self, <br> names: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&[</a>&<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>, <br> f: F<br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>, </span></code></h3><div class='docblock'><p>Read an enumeration value.</p>
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<ul>
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<li><code>names</code> is a list of the enumeration variant names.</li>
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<li><code>f</code> is a function that will call <code>read_enum_variant_arg</code> or
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<code>read_enum_struct_variant_field</code> as appropriate to read the
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associated values. It will be passed the index into <code>names</code> for the
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variant that is encoded.</li>
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</ul>
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</div><h3 id='tymethod.read_enum_variant_arg' class='method'><code id='read_enum_variant_arg.v'>fn <a href='#tymethod.read_enum_variant_arg' class='fnname'>read_enum_variant_arg</a><T, F>(<br> &mut self, <br> a_idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> f: F<br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>, </span></code></h3><div class='docblock'><p>Read an unnamed data item for an enumeration variant.</p>
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<p>This should only be called from a function passed to <code>read_enum_variant</code>
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or <code>read_enum_struct_variant</code>, and only when the index provided to that
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function indicates that the variant has associated unnamed data. It
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should be called once for each associated data item.</p>
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<ul>
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<li><code>a_idx</code> is the (zero-based) index of the data item.</li>
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<li><code>f</code> is a function that will call the appropriate read method to deocde
|
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the data object.</li>
|
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|
</ul>
|
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|
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<p>Note that variant data items must be read in order - starting with index
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<code>0</code> and finishing with index <code>len-1</code>. Implementations may use <code>a_idx</code>,
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the call order or both to select the correct data to decode.</p>
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</div><h3 id='tymethod.read_enum_struct_variant' class='method'><code id='read_enum_struct_variant.v'>fn <a href='#tymethod.read_enum_struct_variant' class='fnname'>read_enum_struct_variant</a><T, F>(<br> &mut self, <br> names: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&[</a>&<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>, <br> f: F<br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>, </span></code></h3><div class='docblock'><p>Read an enumeration value.</p>
|
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|
<p>This is identical to <code>read_enum_variant</code>, and is only provided for
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symmetry with the <code>Encoder</code> API.</p>
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</div><h3 id='tymethod.read_enum_struct_variant_field' class='method'><code id='read_enum_struct_variant_field.v'>fn <a href='#tymethod.read_enum_struct_variant_field' class='fnname'>read_enum_struct_variant_field</a><T, F>(<br> &mut self, <br> f_name: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, <br> f_idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> f: F<br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>, </span></code></h3><div class='docblock'><p>Read a named data item for an enumeration variant.</p>
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<p>This should only be called from a function passed to <code>read_enum_variant</code>
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or <code>read_enum_struct_variant</code>, and only when the index provided to that
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function indicates that the variant has associated named data. It should
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be called once for each associated field.</p>
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<ul>
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<li><code>f_name</code> is the name of the field.</li>
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<li><code>f_idx</code> is the (zero-based) index of the data item.</li>
|
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|
|
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<li><code>f</code> is a function that will call the appropriate read method to deocde
|
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|
|
|
the data object.</li>
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
<p>Note that fields must be read in order - starting with index <code>0</code> and
|
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|
|
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|
finishing with index <code>len-1</code>. Implementations may use <code>f_idx</code>, <code>f_name</code>,
|
|
|
|
|
|
the call order or any combination to choose the correct data to decode,
|
|
|
|
|
|
and may (but are not required to) return an error if these are
|
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|
|
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inconsistent.</p>
|
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</div><h3 id='tymethod.read_struct' class='method'><code id='read_struct.v'>fn <a href='#tymethod.read_struct' class='fnname'>read_struct</a><T, F>(<br> &mut self, <br> s_name: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, <br> len: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> f: F<br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>, </span></code></h3><div class='docblock'><p>Read an struct value.</p>
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|
|
|
|
<ul>
|
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|
|
|
|
<li><code>s_name</code> indicates the struct type name. It may be used to
|
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|
|
|
|
sanity-check the data being read.</li>
|
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|
|
|
|
<li><code>len</code> indicates the number of fields in the struct.</li>
|
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<li><code>f</code> is a function that will call <code>read_struct_field</code> for each field in
|
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|
the struct.</li>
|
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|
</ul>
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</div><h3 id='tymethod.read_struct_field' class='method'><code id='read_struct_field.v'>fn <a href='#tymethod.read_struct_field' class='fnname'>read_struct_field</a><T, F>(<br> &mut self, <br> f_name: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, <br> f_idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> f: F<br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>, </span></code></h3><div class='docblock'><p>Read a field for a struct value.</p>
|
|
|
|
|
|
<p>This should only be called from a function passed to <code>read_struct</code>. It
|
|
|
|
|
|
should be called once for each associated field.</p>
|
|
|
|
|
|
<ul>
|
|
|
|
|
|
<li><code>f_name</code> is the name of the field.</li>
|
|
|
|
|
|
<li><code>f_idx</code> is the (zero-based) index of the data item.</li>
|
|
|
|
|
|
<li><code>f</code> is a function that will call the appropriate read method to deocde
|
|
|
|
|
|
the data object.</li>
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
<p>Note that fields must be read in order - starting with index <code>0</code> and
|
|
|
|
|
|
finishing with index <code>len-1</code>. Implementations may use <code>f_idx</code>, <code>f_name</code>,
|
|
|
|
|
|
the call order or any combination to choose the correct data to decode,
|
|
|
|
|
|
and may (but are not required to) return an error if these are
|
|
|
|
|
|
inconsistent.</p>
|
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|
|
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|
</div><h3 id='tymethod.read_tuple' class='method'><code id='read_tuple.v'>fn <a href='#tymethod.read_tuple' class='fnname'>read_tuple</a><T, F>(&mut self, len: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>, </span></code></h3><div class='docblock'><p>Read a tuple value.</p>
|
|
|
|
|
|
<ul>
|
|
|
|
|
|
<li><code>len</code> is the number of items in the tuple.</li>
|
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|
|
|
|
<li><code>f</code> is a function that will call <code>read_tuple_arg</code> for each item in the
|
|
|
|
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|
tuple.</li>
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
<p>Note that external <code>Decodable</code> implementations should not normally need
|
|
|
|
|
|
to use this method directly; it is meant for the use of this module's
|
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|
|
|
|
own implementation of <code>Decodable</code> for tuples.</p>
|
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</div><h3 id='tymethod.read_tuple_arg' class='method'><code id='read_tuple_arg.v'>fn <a href='#tymethod.read_tuple_arg' class='fnname'>read_tuple_arg</a><T, F>(&mut self, a_idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>, </span></code></h3><div class='docblock'><p>Read a data item for a tuple.</p>
|
|
|
|
|
|
<p>This should only be called from a function passed to <code>read_tuple</code>.</p>
|
|
|
|
|
|
<ul>
|
|
|
|
|
|
<li><code>a_idx</code> is the (zero-based) index of the data item.</li>
|
|
|
|
|
|
<li><code>f</code> is a function that will call the appropriate read method to encode
|
|
|
|
|
|
the data object.</li>
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
<p>Note that tuple items must be read in order - starting with index <code>0</code>
|
|
|
|
|
|
and finishing with index <code>len-1</code>.</p>
|
|
|
|
|
|
</div><h3 id='tymethod.read_tuple_struct' class='method'><code id='read_tuple_struct.v'>fn <a href='#tymethod.read_tuple_struct' class='fnname'>read_tuple_struct</a><T, F>(<br> &mut self, <br> s_name: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, <br> len: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> f: F<br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>, </span></code></h3><div class='docblock'><p>Read a tuple struct value.</p>
|
|
|
|
|
|
<ul>
|
|
|
|
|
|
<li><code>s_name</code> is the name of the tuple struct.</li>
|
|
|
|
|
|
<li><code>len</code> is the number of items in the tuple struct.</li>
|
|
|
|
|
|
<li><code>f</code> is a function that calls <code>read_tuple_struct_arg</code> for each member.</li>
|
|
|
|
|
|
</ul>
|
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|
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</div><h3 id='tymethod.read_tuple_struct_arg' class='method'><code id='read_tuple_struct_arg.v'>fn <a href='#tymethod.read_tuple_struct_arg' class='fnname'>read_tuple_struct_arg</a><T, F>(<br> &mut self, <br> a_idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> f: F<br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>, </span></code></h3><div class='docblock'><p>Read a data item for a tuple struct.</p>
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<p>This should only be called from a function passed to
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<code>read_tuple_struct</code>.</p>
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<ul>
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<li><code>a_idx</code> is the (zero-based) index of the data item.</li>
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<li><code>f</code> is a function that will call the appropriate read method to encode
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the data object.</li>
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</ul>
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<p>Note that tuple struct items must be read in order - starting with index
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<code>0</code> and finishing with index <code>len-1</code>.</p>
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</div><h3 id='tymethod.read_option' class='method'><code id='read_option.v'>fn <a href='#tymethod.read_option' class='fnname'>read_option</a><T, F>(&mut self, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>, </span></code></h3><div class='docblock'><p>Read an optional value.</p>
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<p><code>f</code> is a function that will will be passed be passed <code>false</code> if the
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value is unset, and <code>true</code> if it is set. If the function is passed
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<code>true</code>, it will call the appropriate read methods to read the associated
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data type.</p>
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<p>This method allows decoders to handle <code>Option<T></code> values specially,
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rather than using the generic enum methods, because many encoding
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formats have a built-in "optional" concept.</p>
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<p>Note that external <code>Decodable</code> implementations should not normally need
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to use this method directly; it is meant for the use of this module's
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own implementation of <code>Decodable</code> for <code>Option<T></code>.</p>
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</div><h3 id='tymethod.read_seq' class='method'><code id='read_seq.v'>fn <a href='#tymethod.read_seq' class='fnname'>read_seq</a><T, F>(&mut self, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>, </span></code></h3><div class='docblock'><p>Read a sequence of values.</p>
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<p>This should be used for both array-like ordered sequences and set-like
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unordered ones.</p>
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<ul>
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<li><code>f</code> is a function that will be passed the length of the sequence, and
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will call <code>read_seq_elt</code> for each value in the sequence.</li>
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</ul>
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</div><h3 id='tymethod.read_seq_elt' class='method'><code id='read_seq_elt.v'>fn <a href='#tymethod.read_seq_elt' class='fnname'>read_seq_elt</a><T, F>(&mut self, idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>, </span></code></h3><div class='docblock'><p>Read an element in the sequence.</p>
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<p>This should only be called from a function passed to <code>read_seq</code>.</p>
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<ul>
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<li><code>idx</code> is the (zero-based) index of the value in the sequence.</li>
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<li><code>f</code> is a function that will call the appropriate read method to decode
|
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the data object.</li>
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</ul>
|
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<p>Note that sequence elements must be read in order - starting with index
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<code>0</code> and finishing with index <code>len-1</code>.</p>
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</div><h3 id='tymethod.read_map' class='method'><code id='read_map.v'>fn <a href='#tymethod.read_map' class='fnname'>read_map</a><T, F>(&mut self, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>, </span></code></h3><div class='docblock'><p>Read an associative container (map).</p>
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<ul>
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<li><code>f</code> is a function that will be passed the number of entries in the
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map, and will call <code>read_map_elt_key</code> and <code>read_map_elt_val</code> to decode
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each entry.</li>
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</ul>
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</div><h3 id='tymethod.read_map_elt_key' class='method'><code id='read_map_elt_key.v'>fn <a href='#tymethod.read_map_elt_key' class='fnname'>read_map_elt_key</a><T, F>(&mut self, idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>, </span></code></h3><div class='docblock'><p>Read the key for an entry in a map.</p>
|
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<p>This should only be called from a function passed to <code>read_map</code>.</p>
|
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|
<ul>
|
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|
|
|
|
<li><code>idx</code> is the (zero-based) index of the entry in the map</li>
|
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|
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|
<li><code>f</code> is a function that will call the appropriate read method to decode
|
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|
the key.</li>
|
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|
|
|
</ul>
|
|
|
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<p>Note that map entries must be read in order - starting with index <code>0</code>
|
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|
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|
and finishing with index <code>len-1</code> - and for each entry, the key should be
|
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|
read followed immediately by the value.</p>
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</div><h3 id='tymethod.read_map_elt_val' class='method'><code id='read_map_elt_val.v'>fn <a href='#tymethod.read_map_elt_val' class='fnname'>read_map_elt_val</a><T, F>(&mut self, idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a>>, </span></code></h3><div class='docblock'><p>Read the value for an entry in a map.</p>
|
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|
|
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|
<p>This should only be called from a function passed to <code>read_map</code>.</p>
|
|
|
|
|
|
<ul>
|
|
|
|
|
|
<li><code>idx</code> is the (zero-based) index of the entry in the map</li>
|
|
|
|
|
|
<li><code>f</code> is a function that will call the appropriate read method to decode
|
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|
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|
the value.</li>
|
|
|
|
|
|
</ul>
|
|
|
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|
<p>Note that map entries must be read in order - starting with index <code>0</code>
|
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|
|
|
|
and finishing with index <code>len-1</code> - and for each entry, the key should be
|
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|
read followed immediately by the value.</p>
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</div><h3 id='tymethod.error' class='method'><code id='error.v'>fn <a href='#tymethod.error' class='fnname'>error</a>(&mut self, err: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -> Self::<a class="type" href="../rustc_serialize/trait.Decoder.html#associatedtype.Error" title="type rustc_serialize::Decoder::Error">Error</a></code></h3><div class='docblock'><p>Record a decoding error.</p>
|
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<p>This allows <code>Decodable</code> implementations to report an error using a
|
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|
<code>Decoder</code> implementation's error type when inconsistent data is read.
|
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|
For example, when reading a fixed-length array and the wrong length is
|
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given by <code>read_seq</code>.</p>
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</div></div><span class='loading-content'>Loading content...</span>
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<h2 id='implementors' class='small-section-header'>Implementors<a href='#implementors' class='anchor'></a></h2><div class='item-list' id='implementors-list'><h3 id='impl-Decoder' class='impl'><code class='in-band'>impl Decoder for <a class="struct" href="../rustc_serialize/json/struct.Decoder.html" title="struct rustc_serialize::json::Decoder">Decoder</a></code><a href='#impl-Decoder' class='anchor'></a><a class='srclink' href='../src/rustc_serialize/json.rs.html#2118-2376' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Error-1' class="type"><code id='Error.t-1'>type <a href='#associatedtype.Error-1' class="type">Error</a> = <a class="enum" href="../rustc_serialize/json/enum.DecoderError.html" title="enum rustc_serialize::json::DecoderError">DecoderError</a></code></h4><h4 id='method.read_nil' class="method hidden"><code id='read_nil.v-1'>fn <a href='#method.read_nil' class='fnname'>read_nil</a>(&mut self) -> <a class="type" href="../rustc_serialize/json/type.DecodeResult.html" title="type rustc_serialize::json::DecodeResult">DecodeResult</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>></code><a class='srclink' href='../src/rustc_serialize/json.rs.html#2121-2123' title='goto source code'>[src]</a></h4><h4 id='method.read_usize' class="method hidden"><code id='read_usize.v-1'>fn <a href='#method.read_usize' class='fnname'>read_usize</a>(&mut self) -> <a class="type" href="../rustc_serialize/json/type.DecodeResult.html" title="type rustc_serialize::json::DecodeResult">DecodeResult</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>></code><a class='srclink' href='../src/rustc_serialize/json.rs.html#2083-2114' title='goto source code'>[src]</a></h4><h4 id='method.read_u8' class="method hidden"><code id='read_u8.v-1'>fn <a href='#method.read_u8' class='fnname'>read_u8</a>(&mut self) -> <a class="type" href="../rustc_serialize/json/type.DecodeResult.html" title="type rustc_serialize::json::DecodeResult">DecodeResult</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>></code><a class='srclink' href='../src/rustc_serialize/json.rs.html#2083-2114' title='goto source code'>[src]</a></h4><h4 id='method.read_u16' class="method hidden"><code id='read_u16.v-1'>fn <a href='#method.read_u16' class='fnname'>read_u16</a>(&mut self) -> <a class="type" href="../rustc_serialize/json/type.DecodeResult.html" title="type rustc_serialize::json::DecodeResult">DecodeResult</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u16.html">u16</a>></code><a class='srclink' href='../src/rustc_serialize/json.rs.html#2083-2114' title='goto source code'>[src]</a></h4><h4 id='method.read_u32' class="method hidden"><code id='read_u32.v-1'>fn <a href='#method.read_u32' class='fnname'>read_u32</a>(&mut self) -> <a class="type" href="../rustc_serialize/json/type.DecodeResult.html" title="type rustc_serialize::json::DecodeResult">DecodeResult</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>></code><a class='srclink' href='../src/rustc_serialize/json.rs.html#2083-2114' title='goto source code'>[src]</a></h4><h4 id='method.read_u64' class="method hidden"><code id='read_u64.v-1'>fn <a href='#method.read_u64' class='fnname'>read_u64</a>(&mut self) -> <a class="type" href="../rustc_serialize/json/type.DecodeResult.html" title="type rustc_serialize::json::DecodeResult">DecodeResult</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>></code><a class='srclink' href='../src/rustc_serialize/json.rs.html#2083-2114' title='goto source code'>[src]</a></h4><h4 id='method.read_isize' class="method hidden"><code id='read_isize.v-1'>fn <a href='#method.read_isize' class='fnname'>read_isize</a>(&mut self) -> <a class="type" href="../rustc_serialize/json/type.DecodeResult.html" title="type
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src="../implementors/rustc_serialize/trait.Decoder.js">
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</script></section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g., <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g., <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g., <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../";window.currentCrate = "rustc_serialize";</script><script src="../aliases.js"></script><script src="../main.js"></script><script defer src="../search-index.js"></script></body></html>
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