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<h1 class='fqn'><span class='in-band'>Trait <a href='index.html'>rustc_serialize</a>::<wbr><a class="trait" href=''>Decoder</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../src/rustc_serialize/serialize.rs.html#505-799' title='goto source code'>[src]</a></span></h1>
<pre class='rust trait'>pub trait Decoder {
type <a href='#associatedtype.Error' class="type">Error</a>;
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.tuple.html">()</a>, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>;
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/collections/string/struct.String.html" title="struct collections::string::String">String</a>, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></span>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&mut 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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></span>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></span>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&mut 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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></span>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></span>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></span>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></span>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></span>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></span>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></span>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></span>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&mut 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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></span>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</a>(&mut 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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></span>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></span>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</a>(&mut 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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></span>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></span>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></span>;
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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>;
}</pre><div class='docblock'><p>Trait for reading in an encoding for deserialization.</p>
<p>This trait provides methods to decode basic types and generic forms of
collections. Implementations of <code>Decodable</code> use it to perform the actual
decoding of a type.</p>
<p>Note that, as is typical with deserialization, the design of this API
assumes you know in advance the form of the data you are decoding (ie: what
type is encoded).</p>
<p>Decoders can expect to only have a single "root" method call made on this
trait. Non-trivial types will call one of the collection-reading methods,
passing a function that may call other methods on the trait, but once the
collection-reading method has returned, decoding should be complete.</p>
</div>
<h2 id='associated-types'>Associated Types</h2>
<div class='methods'>
<h3 id='associatedtype.Error' class='method'><span id='Error.t' class='invisible'><code>type <a href='#associatedtype.Error' class="type">Error</a></code></span></h3><div class='docblock'><p>The error type for method results.</p>
</div></div>
<h2 id='required-methods'>Required Methods</h2>
<div class='methods'>
<h3 id='tymethod.read_nil' class='method'><span id='read_nil.v' class='invisible'><code>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.tuple.html">()</a>, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></code></span></h3><div class='docblock'><p>Read a nil value.</p>
</div><h3 id='tymethod.read_usize' class='method'><span id='read_usize.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></code></span></h3><div class='docblock'><p>Read a usize value.</p>
</div><h3 id='tymethod.read_u64' class='method'><span id='read_u64.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></code></span></h3><div class='docblock'><p>Read a u64 value.</p>
</div><h3 id='tymethod.read_u32' class='method'><span id='read_u32.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></code></span></h3><div class='docblock'><p>Read a u32 value.</p>
</div><h3 id='tymethod.read_u16' class='method'><span id='read_u16.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></code></span></h3><div class='docblock'><p>Read a u16 value.</p>
</div><h3 id='tymethod.read_u8' class='method'><span id='read_u8.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></code></span></h3><div class='docblock'><p>Read a u8 value.</p>
</div><h3 id='tymethod.read_isize' class='method'><span id='read_isize.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></code></span></h3><div class='docblock'><p>Read a isize value.</p>
</div><h3 id='tymethod.read_i64' class='method'><span id='read_i64.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></code></span></h3><div class='docblock'><p>Read a i64 value.</p>
</div><h3 id='tymethod.read_i32' class='method'><span id='read_i32.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></code></span></h3><div class='docblock'><p>Read a i32 value.</p>
</div><h3 id='tymethod.read_i16' class='method'><span id='read_i16.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></code></span></h3><div class='docblock'><p>Read a i16 value.</p>
</div><h3 id='tymethod.read_i8' class='method'><span id='read_i8.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></code></span></h3><div class='docblock'><p>Read a i8 value.</p>
</div><h3 id='tymethod.read_bool' class='method'><span id='read_bool.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></code></span></h3><div class='docblock'><p>Read a bool value.</p>
</div><h3 id='tymethod.read_f64' class='method'><span id='read_f64.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></code></span></h3><div class='docblock'><p>Read a f64 value.</p>
</div><h3 id='tymethod.read_f32' class='method'><span id='read_f32.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></code></span></h3><div class='docblock'><p>Read a f32 value.</p>
</div><h3 id='tymethod.read_char' class='method'><span id='read_char.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></code></span></h3><div class='docblock'><p>Read a char value.</p>
</div><h3 id='tymethod.read_str' class='method'><span id='read_str.v' class='invisible'><code>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/collections/string/struct.String.html" title="struct collections::string::String">String</a>, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>></code></span></h3><div class='docblock'><p>Read a string value.</p>
</div><h3 id='tymethod.read_enum' class='method'><span id='read_enum.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>, </span></code></span></h3><div class='docblock'><p>Read an enumeration value.</p>
<ul>
<li><code>name</code> indicates the enumeration type name. It may be used to
sanity-check the data being read.</li>
<li><code>f</code> is a function that will call <code>read_enum_variant</code> (or
<code>read_enum_struct_variant</code>) to read the actual value.</li>
</ul>
</div><h3 id='tymethod.read_enum_variant' class='method'><span id='read_enum_variant.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&mut 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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>, </span></code></span></h3><div class='docblock'><p>Read an enumeration value.</p>
<ul>
<li><code>names</code> is a list of the enumeration variant names.</li>
<li><code>f</code> is a function that will call <code>read_enum_variant_arg</code> or
<code>read_enum_struct_variant_field</code> as appropriate to read the
associated values. It will be passed the index into <code>names</code> for the
variant that is encoded.</li>
</ul>
</div><h3 id='tymethod.read_enum_variant_arg' class='method'><span id='read_enum_variant_arg.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>, </span></code></span></h3><div class='docblock'><p>Read an unnamed data item for an enumeration variant.</p>
<p>This should only be called from a function passed to <code>read_enum_variant</code>
or <code>read_enum_struct_variant</code>, and only when the index provided to that
function indicates that the variant has associated unnamed data. It
should be called once for each associated data item.</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 deocde
the data object.</li>
</ul>
<p>Note that variant data items must be read in order - starting with index
<code>0</code> and finishing with index <code>len-1</code>. Implementations may use <code>a_idx</code>,
the call order or both to select the correct data to decode.</p>
</div><h3 id='tymethod.read_enum_struct_variant' class='method'><span id='read_enum_struct_variant.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&mut 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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>, </span></code></span></h3><div class='docblock'><p>Read an enumeration value.</p>
<p>This is identical to <code>read_enum_variant</code>, and is only provided for
symmetry with the <code>Encoder</code> API.</p>
</div><h3 id='tymethod.read_enum_struct_variant_field' class='method'><span id='read_enum_struct_variant_field.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>, </span></code></span></h3><div class='docblock'><p>Read a named data item for an enumeration variant.</p>
<p>This should only be called from a function passed to <code>read_enum_variant</code>
or <code>read_enum_struct_variant</code>, and only when the index provided to that
function indicates that the variant has associated named data. 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>
</div><h3 id='tymethod.read_struct' class='method'><span id='read_struct.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>, </span></code></span></h3><div class='docblock'><p>Read an struct value.</p>
<ul>
<li><code>s_name</code> indicates the struct type name. It may be used to
sanity-check the data being read.</li>
<li><code>len</code> indicates the number of fields in the struct.</li>
<li><code>f</code> is a function that will call <code>read_struct_field</code> for each field in
the struct.</li>
</ul>
</div><h3 id='tymethod.read_struct_field' class='method'><span id='read_struct_field.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>, </span></code></span></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>
</div><h3 id='tymethod.read_tuple' class='method'><span id='read_tuple.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>, </span></code></span></h3><div class='docblock'><p>Read a tuple value.</p>
<ul>
<li><code>len</code> is the number of items in the tuple.</li>
<li><code>f</code> is a function that will call <code>read_tuple_arg</code> for each item in the
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
own implementation of <code>Decodable</code> for tuples.</p>
</div><h3 id='tymethod.read_tuple_arg' class='method'><span id='read_tuple_arg.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>, </span></code></span></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'><span id='read_tuple_struct.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>, </span></code></span></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>
</div><h3 id='tymethod.read_tuple_struct_arg' class='method'><span id='read_tuple_struct_arg.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>, </span></code></span></h3><div class='docblock'><p>Read a data item for a tuple struct.</p>
<p>This should only be called from a function passed to
<code>read_tuple_struct</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 struct 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_option' class='method'><span id='read_option.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(&mut 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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>, </span></code></span></h3><div class='docblock'><p>Read an optional value.</p>
<p><code>f</code> is a function that will will be passed be passed <code>false</code> if the
value is unset, and <code>true</code> if it is set. If the function is passed
<code>true</code>, it will call the appropriate read methods to read the associated
data type.</p>
<p>This method allows decoders to handle <code>Option<T></code> values specially,
rather than using the generic enum methods, because many encoding
formats have a built-in "optional" concept.</p>
<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
own implementation of <code>Decodable</code> for <code>Option<T></code>.</p>
</div><h3 id='tymethod.read_seq' class='method'><span id='read_seq.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</a>(&mut 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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>, </span></code></span></h3><div class='docblock'><p>Read a sequence of values.</p>
<p>This should be used for both array-like ordered sequences and set-like
unordered ones.</p>
<ul>
<li><code>f</code> is a function that will be passed the length of the sequence, and
will call <code>read_seq_elt</code> for each value in the sequence.</li>
</ul>
</div><h3 id='tymethod.read_seq_elt' class='method'><span id='read_seq_elt.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>, </span></code></span></h3><div class='docblock'><p>Read an element in the sequence.</p>
<p>This should only be called from a function passed to <code>read_seq</code>.</p>
<ul>
<li><code>idx</code> is the (zero-based) index of the value in the sequence.</li>
<li><code>f</code> is a function that will call the appropriate read method to decode
the data object.</li>
</ul>
<p>Note that sequence elements 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_map' class='method'><span id='read_map.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</a>(&mut 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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>, </span></code></span></h3><div class='docblock'><p>Read an associative container (map).</p>
<ul>
<li><code>f</code> is a function that will be passed the number of entries in the
map, and will call <code>read_map_elt_key</code> and <code>read_map_elt_val</code> to decode
each entry.</li>
</ul>
</div><h3 id='tymethod.read_map_elt_key' class='method'><span id='read_map_elt_key.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>, </span></code></span></h3><div class='docblock'><p>Read the key for an entry in a map.</p>
<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
the key.</li>
</ul>
<p>Note that map entries must be read in order - starting with index <code>0</code>
and finishing with index <code>len-1</code> - and for each entry, the key should be
read followed immediately by the value.</p>
</div><h3 id='tymethod.read_map_elt_val' class='method'><span id='read_map_elt_val.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/trait.FnOnce.html" title="trait core::ops::FnOnce">FnOnce</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><T, Self::<a class="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a>>, </span></code></span></h3><div class='docblock'><p>Read the value for an entry in a map.</p>
<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
the value.</li>
</ul>
<p>Note that map entries must be read in order - starting with index <code>0</code>
and finishing with index <code>len-1</code> - and for each entry, the key should be
read followed immediately by the value.</p>
</div><h3 id='tymethod.error' class='method'><span id='error.v' class='invisible'><code>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="trait" href="../rustc_serialize/trait.Decoder.html" title="trait rustc_serialize::Decoder">Error</a></code></span></h3><div class='docblock'><p>Record a decoding error.</p>
<p>This allows <code>Decodable</code> implementations to report an error using a
<code>Decoder</code> implementation's error type when inconsistent data is read.
For example, when reading a fixed-length array and the wrong length is
given by <code>read_seq</code>.</p>
</div></div>
<h2 id='implementors'>Implementors</h2>
<ul class='item-list' id='implementors-list'>
<li><code>impl Decoder for <a class="struct" href="../rustc_serialize/json/struct.Decoder.html" title="struct rustc_serialize::json::Decoder">Decoder</a></code></li>
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