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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="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/serde-1.0.163/src/ser/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../serde/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../serde/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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 </pre><pre class="rust"><code><span class="doccomment">//! Generic data structure serialization framework.
 //!
 //! The two most important traits in this module are [`Serialize`] and
 //! [`Serializer`].
 //!
 //!  - **A type that implements `Serialize` is a data structure** that can be
 //!    serialized to any data format supported by Serde, and conversely
 //!  - **A type that implements `Serializer` is a data format** that can
 //!    serialize any data structure supported by Serde.
 //!
 //! # The Serialize trait
 //!
 //! Serde provides [`Serialize`] implementations for many Rust primitive and
 //! standard library types. The complete list is below. All of these can be
 //! serialized using Serde out of the box.
 //!
 //! Additionally, Serde provides a procedural macro called [`serde_derive`] to
 //! automatically generate [`Serialize`] implementations for structs and enums
 //! in your program. See the [derive section of the manual] for how to use this.
 //!
 //! In rare cases it may be necessary to implement [`Serialize`] manually for
 //! some type in your program. See the [Implementing `Serialize`] section of the
 //! manual for more about this.
 //!
 //! Third-party crates may provide [`Serialize`] implementations for types that
 //! they expose. For example the [`linked-hash-map`] crate provides a
 //! [`LinkedHashMap&lt;K, V&gt;`] type that is serializable by Serde because the crate
 //! provides an implementation of [`Serialize`] for it.
 //!
 //! # The Serializer trait
 //!
 //! [`Serializer`] implementations are provided by third-party crates, for
 //! example [`serde_json`], [`serde_yaml`] and [`postcard`].
 //!
 //! A partial list of well-maintained formats is given on the [Serde
 //! website][data formats].
 //!
 //! # Implementations of Serialize provided by Serde
 //!
 //!  - **Primitive types**:
 //!    - bool
 //!    - i8, i16, i32, i64, i128, isize
 //!    - u8, u16, u32, u64, u128, usize
 //!    - f32, f64
 //!    - char
 //!    - str
 //!    - &amp;T and &amp;mut T
 //!  - **Compound types**:
 //!    - \[T\]
 //!    - \[T; 0\] through \[T; 32\]
 //!    - tuples up to size 16
 //!  - **Common standard library types**:
 //!    - String
 //!    - Option\&lt;T\&gt;
 //!    - Result\&lt;T, E\&gt;
 //!    - PhantomData\&lt;T\&gt;
 //!  - **Wrapper types**:
 //!    - Box\&lt;T\&gt;
 //!    - Cow\&lt;&#39;a, T\&gt;
 //!    - Cell\&lt;T\&gt;
 //!    - RefCell\&lt;T\&gt;
 //!    - Mutex\&lt;T\&gt;
 //!    - RwLock\&lt;T\&gt;
 //!    - Rc\&lt;T\&gt;&amp;emsp;*(if* features = [&quot;rc&quot;] *is enabled)*
 //!    - Arc\&lt;T\&gt;&amp;emsp;*(if* features = [&quot;rc&quot;] *is enabled)*
 //!  - **Collection types**:
 //!    - BTreeMap\&lt;K, V\&gt;
 //!    - BTreeSet\&lt;T\&gt;
 //!    - BinaryHeap\&lt;T\&gt;
 //!    - HashMap\&lt;K, V, H\&gt;
 //!    - HashSet\&lt;T, H\&gt;
 //!    - LinkedList\&lt;T\&gt;
 //!    - VecDeque\&lt;T\&gt;
 //!    - Vec\&lt;T\&gt;
 //!  - **FFI types**:
 //!    - CStr
 //!    - CString
 //!    - OsStr
 //!    - OsString
 //!  - **Miscellaneous standard library types**:
 //!    - Duration
 //!    - SystemTime
 //!    - Path
 //!    - PathBuf
 //!    - Range\&lt;T\&gt;
 //!    - RangeInclusive\&lt;T\&gt;
 //!    - Bound\&lt;T\&gt;
 //!    - num::NonZero*
 //!    - `!` *(unstable)*
 //!  - **Net types**:
 //!    - IpAddr
 //!    - Ipv4Addr
 //!    - Ipv6Addr
 //!    - SocketAddr
 //!    - SocketAddrV4
 //!    - SocketAddrV6
 //!
 //! [Implementing `Serialize`]: https://serde.rs/impl-serialize.html
 //! [`LinkedHashMap&lt;K, V&gt;`]: https://docs.rs/linked-hash-map/*/linked_hash_map/struct.LinkedHashMap.html
 //! [`Serialize`]: ../trait.Serialize.html
 //! [`Serializer`]: ../trait.Serializer.html
 //! [`postcard`]: https://github.com/jamesmunns/postcard
 //! [`linked-hash-map`]: https://crates.io/crates/linked-hash-map
 //! [`serde_derive`]: https://crates.io/crates/serde_derive
 //! [`serde_json`]: https://github.com/serde-rs/json
 //! [`serde_yaml`]: https://github.com/dtolnay/serde-yaml
 //! [derive section of the manual]: https://serde.rs/derive.html
 //! [data formats]: https://serde.rs/#data-formats

 </span><span class="kw">use </span>lib::<span class="kw-2">*</span>;

 <span class="kw">mod </span>fmt;
 <span class="kw">mod </span>impls;
 <span class="kw">mod </span>impossible;

 <span class="kw">pub use </span><span class="self">self</span>::impossible::Impossible;

 <span class="attribute">#[cfg(all(feature = <span class="string">&quot;unstable&quot;</span>, not(feature = <span class="string">&quot;std&quot;</span>)))]
 #[doc(inline)]
 </span><span class="kw">pub use </span>core::error::Error <span class="kw">as </span>StdError;
 <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
 #[doc(no_inline)]
 </span><span class="kw">pub use </span>std::error::Error <span class="kw">as </span>StdError;
 <span class="attribute">#[cfg(not(any(feature = <span class="string">&quot;std&quot;</span>, feature = <span class="string">&quot;unstable&quot;</span>)))]
 #[doc(no_inline)]
 </span><span class="kw">pub use </span>std_error::Error <span class="kw">as </span>StdError;

 <span class="comment">////////////////////////////////////////////////////////////////////////////////

 </span><span class="macro">macro_rules! </span>declare_error_trait {
     (Error: Sized $(+ $(<span class="macro-nonterminal">$supertrait</span>:ident)::+)<span class="kw-2">*</span>) =&gt; {
         <span class="doccomment">/// Trait used by `Serialize` implementations to generically construct
         /// errors belonging to the `Serializer` against which they are
         /// currently running.
         ///
         /// # Example implementation
         ///
         /// The [example data format] presented on the website shows an error
         /// type appropriate for a basic JSON data format.
         ///
         /// [example data format]: https://serde.rs/data-format.html
         </span><span class="kw">pub trait </span>Error: Sized $(+ $(<span class="macro-nonterminal">$supertrait</span>)::+)* {
             <span class="doccomment">/// Used when a [`Serialize`] implementation encounters any error
             /// while serializing a type.
             ///
             /// The message should not be capitalized and should not end with a
             /// period.
             ///
             /// For example, a filesystem [`Path`] may refuse to serialize
             /// itself if it contains invalid UTF-8 data.
             ///
             /// ```edition2018
             /// # struct Path;
             /// #
             /// # impl Path {
             /// #     fn to_str(&amp;self) -&gt; Option&lt;&amp;str&gt; {
             /// #         unimplemented!()
             /// #     }
             /// # }
             /// #
             /// use serde::ser::{self, Serialize, Serializer};
             ///
             /// impl Serialize for Path {
             ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
             ///     where
             ///         S: Serializer,
             ///     {
             ///         match self.to_str() {
             ///             Some(s) =&gt; serializer.serialize_str(s),
             ///             None =&gt; Err(ser::Error::custom(&quot;path contains invalid UTF-8 characters&quot;)),
             ///         }
             ///     }
             /// }
             /// ```
             ///
             /// [`Path`]: https://doc.rust-lang.org/std/path/struct.Path.html
             /// [`Serialize`]: ../trait.Serialize.html
             </span><span class="kw">fn </span>custom&lt;T&gt;(msg: T) -&gt; <span class="self">Self
             </span><span class="kw">where
                 </span>T: Display;
         }
     }
 }

 <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
 </span><span class="macro">declare_error_trait!</span>(Error: Sized + StdError);

 <span class="attribute">#[cfg(not(feature = <span class="string">&quot;std&quot;</span>))]
 </span><span class="macro">declare_error_trait!</span>(Error: Sized + Debug + Display);

 <span class="comment">////////////////////////////////////////////////////////////////////////////////

 </span><span class="doccomment">/// A **data structure** that can be serialized into any data format supported
 /// by Serde.
 ///
 /// Serde provides `Serialize` implementations for many Rust primitive and
 /// standard library types. The complete list is [here][crate::ser]. All of
 /// these can be serialized using Serde out of the box.
 ///
 /// Additionally, Serde provides a procedural macro called [`serde_derive`] to
 /// automatically generate `Serialize` implementations for structs and enums in
 /// your program. See the [derive section of the manual] for how to use this.
 ///
 /// In rare cases it may be necessary to implement `Serialize` manually for some
 /// type in your program. See the [Implementing `Serialize`] section of the
 /// manual for more about this.
 ///
 /// Third-party crates may provide `Serialize` implementations for types that
 /// they expose. For example the [`linked-hash-map`] crate provides a
 /// [`LinkedHashMap&lt;K, V&gt;`] type that is serializable by Serde because the crate
 /// provides an implementation of `Serialize` for it.
 ///
 /// [Implementing `Serialize`]: https://serde.rs/impl-serialize.html
 /// [`LinkedHashMap&lt;K, V&gt;`]: https://docs.rs/linked-hash-map/*/linked_hash_map/struct.LinkedHashMap.html
 /// [`linked-hash-map`]: https://crates.io/crates/linked-hash-map
 /// [`serde_derive`]: https://crates.io/crates/serde_derive
 /// [derive section of the manual]: https://serde.rs/derive.html
 </span><span class="kw">pub trait </span>Serialize {
     <span class="doccomment">/// Serialize this value into the given Serde serializer.
     ///
     /// See the [Implementing `Serialize`] section of the manual for more
     /// information about how to implement this method.
     ///
     /// ```edition2018
     /// use serde::ser::{Serialize, SerializeStruct, Serializer};
     ///
     /// struct Person {
     ///     name: String,
     ///     age: u8,
     ///     phones: Vec&lt;String&gt;,
     /// }
     ///
     /// // This is what #[derive(Serialize)] would generate.
     /// impl Serialize for Person {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         let mut s = serializer.serialize_struct(&quot;Person&quot;, 3)?;
     ///         s.serialize_field(&quot;name&quot;, &amp;self.name)?;
     ///         s.serialize_field(&quot;age&quot;, &amp;self.age)?;
     ///         s.serialize_field(&quot;phones&quot;, &amp;self.phones)?;
     ///         s.end()
     ///     }
     /// }
     /// ```
     ///
     /// [Implementing `Serialize`]: https://serde.rs/impl-serialize.html
     </span><span class="kw">fn </span>serialize&lt;S&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, serializer: S) -&gt; <span class="prelude-ty">Result</span>&lt;S::Ok, S::Error&gt;
     <span class="kw">where
         </span>S: Serializer;
 }

 <span class="comment">////////////////////////////////////////////////////////////////////////////////

 </span><span class="doccomment">/// A **data format** that can serialize any data structure supported by Serde.
 ///
 /// The role of this trait is to define the serialization half of the [Serde
 /// data model], which is a way to categorize every Rust data structure into one
 /// of 29 possible types. Each method of the `Serializer` trait corresponds to
 /// one of the types of the data model.
 ///
 /// Implementations of `Serialize` map themselves into this data model by
 /// invoking exactly one of the `Serializer` methods.
 ///
 /// The types that make up the Serde data model are:
 ///
 ///  - **14 primitive types**
 ///    - bool
 ///    - i8, i16, i32, i64, i128
 ///    - u8, u16, u32, u64, u128
 ///    - f32, f64
 ///    - char
 ///  - **string**
 ///    - UTF-8 bytes with a length and no null terminator.
 ///    - When serializing, all strings are handled equally. When deserializing,
 ///      there are three flavors of strings: transient, owned, and borrowed.
 ///  - **byte array** - \[u8\]
 ///    - Similar to strings, during deserialization byte arrays can be
 ///      transient, owned, or borrowed.
 ///  - **option**
 ///    - Either none or some value.
 ///  - **unit**
 ///    - The type of `()` in Rust. It represents an anonymous value containing
 ///      no data.
 ///  - **unit_struct**
 ///    - For example `struct Unit` or `PhantomData&lt;T&gt;`. It represents a named
 ///      value containing no data.
 ///  - **unit_variant**
 ///    - For example the `E::A` and `E::B` in `enum E { A, B }`.
 ///  - **newtype_struct**
 ///    - For example `struct Millimeters(u8)`.
 ///  - **newtype_variant**
 ///    - For example the `E::N` in `enum E { N(u8) }`.
 ///  - **seq**
 ///    - A variably sized heterogeneous sequence of values, for example
 ///      `Vec&lt;T&gt;` or `HashSet&lt;T&gt;`. When serializing, the length may or may not
 ///      be known before iterating through all the data. When deserializing,
 ///      the length is determined by looking at the serialized data.
 ///  - **tuple**
 ///    - A statically sized heterogeneous sequence of values for which the
 ///      length will be known at deserialization time without looking at the
 ///      serialized data, for example `(u8,)` or `(String, u64, Vec&lt;T&gt;)` or
 ///      `[u64; 10]`.
 ///  - **tuple_struct**
 ///    - A named tuple, for example `struct Rgb(u8, u8, u8)`.
 ///  - **tuple_variant**
 ///    - For example the `E::T` in `enum E { T(u8, u8) }`.
 ///  - **map**
 ///    - A heterogeneous key-value pairing, for example `BTreeMap&lt;K, V&gt;`.
 ///  - **struct**
 ///    - A heterogeneous key-value pairing in which the keys are strings and
 ///      will be known at deserialization time without looking at the
 ///      serialized data, for example `struct S { r: u8, g: u8, b: u8 }`.
 ///  - **struct_variant**
 ///    - For example the `E::S` in `enum E { S { r: u8, g: u8, b: u8 } }`.
 ///
 /// Many Serde serializers produce text or binary data as output, for example
 /// JSON or Postcard. This is not a requirement of the `Serializer` trait, and
 /// there are serializers that do not produce text or binary output. One example
 /// is the `serde_json::value::Serializer` (distinct from the main `serde_json`
 /// serializer) that produces a `serde_json::Value` data structure in memory as
 /// output.
 ///
 /// [Serde data model]: https://serde.rs/data-model.html
 ///
 /// # Example implementation
 ///
 /// The [example data format] presented on the website contains example code for
 /// a basic JSON `Serializer`.
 ///
 /// [example data format]: https://serde.rs/data-format.html
 </span><span class="kw">pub trait </span>Serializer: Sized {
     <span class="doccomment">/// The output type produced by this `Serializer` during successful
     /// serialization. Most serializers that produce text or binary output
     /// should set `Ok = ()` and serialize into an [`io::Write`] or buffer
     /// contained within the `Serializer` instance. Serializers that build
     /// in-memory data structures may be simplified by using `Ok` to propagate
     /// the data structure around.
     ///
     /// [`io::Write`]: https://doc.rust-lang.org/std/io/trait.Write.html
     </span><span class="kw">type </span><span class="prelude-val">Ok</span>;

     <span class="doccomment">/// The error type when some error occurs during serialization.
     </span><span class="kw">type </span>Error: Error;

     <span class="doccomment">/// Type returned from [`serialize_seq`] for serializing the content of the
     /// sequence.
     ///
     /// [`serialize_seq`]: #tymethod.serialize_seq
     </span><span class="kw">type </span>SerializeSeq: SerializeSeq&lt;<span class="prelude-val">Ok </span>= <span class="self">Self</span>::Ok, Error = <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Type returned from [`serialize_tuple`] for serializing the content of
     /// the tuple.
     ///
     /// [`serialize_tuple`]: #tymethod.serialize_tuple
     </span><span class="kw">type </span>SerializeTuple: SerializeTuple&lt;<span class="prelude-val">Ok </span>= <span class="self">Self</span>::Ok, Error = <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Type returned from [`serialize_tuple_struct`] for serializing the
     /// content of the tuple struct.
     ///
     /// [`serialize_tuple_struct`]: #tymethod.serialize_tuple_struct
     </span><span class="kw">type </span>SerializeTupleStruct: SerializeTupleStruct&lt;<span class="prelude-val">Ok </span>= <span class="self">Self</span>::Ok, Error = <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Type returned from [`serialize_tuple_variant`] for serializing the
     /// content of the tuple variant.
     ///
     /// [`serialize_tuple_variant`]: #tymethod.serialize_tuple_variant
     </span><span class="kw">type </span>SerializeTupleVariant: SerializeTupleVariant&lt;<span class="prelude-val">Ok </span>= <span class="self">Self</span>::Ok, Error = <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Type returned from [`serialize_map`] for serializing the content of the
     /// map.
     ///
     /// [`serialize_map`]: #tymethod.serialize_map
     </span><span class="kw">type </span>SerializeMap: SerializeMap&lt;<span class="prelude-val">Ok </span>= <span class="self">Self</span>::Ok, Error = <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Type returned from [`serialize_struct`] for serializing the content of
     /// the struct.
     ///
     /// [`serialize_struct`]: #tymethod.serialize_struct
     </span><span class="kw">type </span>SerializeStruct: SerializeStruct&lt;<span class="prelude-val">Ok </span>= <span class="self">Self</span>::Ok, Error = <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Type returned from [`serialize_struct_variant`] for serializing the
     /// content of the struct variant.
     ///
     /// [`serialize_struct_variant`]: #tymethod.serialize_struct_variant
     </span><span class="kw">type </span>SerializeStructVariant: SerializeStructVariant&lt;<span class="prelude-val">Ok </span>= <span class="self">Self</span>::Ok, Error = <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Serialize a `bool` value.
     ///
     /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
     /// #
     /// impl Serialize for bool {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.serialize_bool(*self)
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_bool(<span class="self">self</span>, v: bool) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Serialize an `i8` value.
     ///
     /// If the format does not differentiate between `i8` and `i64`, a
     /// reasonable implementation would be to cast the value to `i64` and
     /// forward to `serialize_i64`.
     ///
     /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
     /// #
     /// impl Serialize for i8 {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.serialize_i8(*self)
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_i8(<span class="self">self</span>, v: i8) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Serialize an `i16` value.
     ///
     /// If the format does not differentiate between `i16` and `i64`, a
     /// reasonable implementation would be to cast the value to `i64` and
     /// forward to `serialize_i64`.
     ///
     /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
     /// #
     /// impl Serialize for i16 {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.serialize_i16(*self)
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_i16(<span class="self">self</span>, v: i16) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Serialize an `i32` value.
     ///
     /// If the format does not differentiate between `i32` and `i64`, a
     /// reasonable implementation would be to cast the value to `i64` and
     /// forward to `serialize_i64`.
     ///
     /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
     /// #
     /// impl Serialize for i32 {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.serialize_i32(*self)
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_i32(<span class="self">self</span>, v: i32) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Serialize an `i64` value.
     ///
     /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
     /// #
     /// impl Serialize for i64 {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.serialize_i64(*self)
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_i64(<span class="self">self</span>, v: i64) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;

     <span class="macro">serde_if_integer128! </span>{
         <span class="doccomment">/// Serialize an `i128` value.
         ///
         /// ```edition2018
         /// # use serde::Serializer;
         /// #
         /// # serde::__private_serialize!();
         /// #
         /// impl Serialize for i128 {
         ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
         ///     where
         ///         S: Serializer,
         ///     {
         ///         serializer.serialize_i128(*self)
         ///     }
         /// }
         /// ```
         ///
         /// This method is available only on Rust compiler versions &gt;=1.26. The
         /// default behavior unconditionally returns an error.
         </span><span class="kw">fn </span>serialize_i128(<span class="self">self</span>, v: i128) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt; {
             <span class="kw">let _ </span>= v;
             <span class="prelude-val">Err</span>(Error::custom(<span class="string">&quot;i128 is not supported&quot;</span>))
         }
     }

     <span class="doccomment">/// Serialize a `u8` value.
     ///
     /// If the format does not differentiate between `u8` and `u64`, a
     /// reasonable implementation would be to cast the value to `u64` and
     /// forward to `serialize_u64`.
     ///
     /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
     /// #
     /// impl Serialize for u8 {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.serialize_u8(*self)
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_u8(<span class="self">self</span>, v: u8) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Serialize a `u16` value.
     ///
     /// If the format does not differentiate between `u16` and `u64`, a
     /// reasonable implementation would be to cast the value to `u64` and
     /// forward to `serialize_u64`.
     ///
     /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
     /// #
     /// impl Serialize for u16 {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.serialize_u16(*self)
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_u16(<span class="self">self</span>, v: u16) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Serialize a `u32` value.
     ///
     /// If the format does not differentiate between `u32` and `u64`, a
     /// reasonable implementation would be to cast the value to `u64` and
     /// forward to `serialize_u64`.
     ///
     /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
     /// #
     /// impl Serialize for u32 {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.serialize_u32(*self)
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_u32(<span class="self">self</span>, v: u32) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Serialize a `u64` value.
     ///
     /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
     /// #
     /// impl Serialize for u64 {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.serialize_u64(*self)
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_u64(<span class="self">self</span>, v: u64) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;

     <span class="macro">serde_if_integer128! </span>{
         <span class="doccomment">/// Serialize a `u128` value.
         ///
         /// ```edition2018
         /// # use serde::Serializer;
         /// #
         /// # serde::__private_serialize!();
         /// #
         /// impl Serialize for u128 {
         ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
         ///     where
         ///         S: Serializer,
         ///     {
         ///         serializer.serialize_u128(*self)
         ///     }
         /// }
         /// ```
         ///
         /// This method is available only on Rust compiler versions &gt;=1.26. The
         /// default behavior unconditionally returns an error.
         </span><span class="kw">fn </span>serialize_u128(<span class="self">self</span>, v: u128) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt; {
             <span class="kw">let _ </span>= v;
             <span class="prelude-val">Err</span>(Error::custom(<span class="string">&quot;u128 is not supported&quot;</span>))
         }
     }

     <span class="doccomment">/// Serialize an `f32` value.
     ///
     /// If the format does not differentiate between `f32` and `f64`, a
     /// reasonable implementation would be to cast the value to `f64` and
     /// forward to `serialize_f64`.
     ///
     /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
     /// #
     /// impl Serialize for f32 {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.serialize_f32(*self)
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_f32(<span class="self">self</span>, v: f32) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Serialize an `f64` value.
     ///
     /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
     /// #
     /// impl Serialize for f64 {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.serialize_f64(*self)
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_f64(<span class="self">self</span>, v: f64) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Serialize a character.
     ///
     /// If the format does not support characters, it is reasonable to serialize
     /// it as a single element `str` or a `u32`.
     ///
     /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
     /// #
     /// impl Serialize for char {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.serialize_char(*self)
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_char(<span class="self">self</span>, v: char) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Serialize a `&amp;str`.
     ///
     /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
     /// #
     /// impl Serialize for str {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.serialize_str(self)
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_str(<span class="self">self</span>, v: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Serialize a chunk of raw byte data.
     ///
     /// Enables serializers to serialize byte slices more compactly or more
     /// efficiently than other types of slices. If no efficient implementation
     /// is available, a reasonable implementation would be to forward to
     /// `serialize_seq`. If forwarded, the implementation looks usually just
     /// like this:
     ///
     /// ```edition2018
     /// # use serde::ser::{Serializer, SerializeSeq};
     /// # use serde::__private::doc::Error;
     /// #
     /// # struct MySerializer;
     /// #
     /// # impl Serializer for MySerializer {
     /// #     type Ok = ();
     /// #     type Error = Error;
     /// #
     /// fn serialize_bytes(self, v: &amp;[u8]) -&gt; Result&lt;Self::Ok, Self::Error&gt; {
     ///     let mut seq = self.serialize_seq(Some(v.len()))?;
     ///     for b in v {
     ///         seq.serialize_element(b)?;
     ///     }
     ///     seq.end()
     /// }
     /// #
     /// #     serde::__serialize_unimplemented! {
     /// #         bool i8 i16 i32 i64 u8 u16 u32 u64 f32 f64 char str none some
     /// #         unit unit_struct unit_variant newtype_struct newtype_variant
     /// #         seq tuple tuple_struct tuple_variant map struct struct_variant
     /// #     }
     /// # }
     /// ```
     </span><span class="kw">fn </span>serialize_bytes(<span class="self">self</span>, v: <span class="kw-2">&amp;</span>[u8]) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Serialize a [`None`] value.
     ///
     /// ```edition2018
     /// # use serde::{Serialize, Serializer};
     /// #
     /// # enum Option&lt;T&gt; {
     /// #     Some(T),
     /// #     None,
     /// # }
     /// #
     /// # use self::Option::{Some, None};
     /// #
     /// impl&lt;T&gt; Serialize for Option&lt;T&gt;
     /// where
     ///     T: Serialize,
     /// {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         match *self {
     ///             Some(ref value) =&gt; serializer.serialize_some(value),
     ///             None =&gt; serializer.serialize_none(),
     ///         }
     ///     }
     /// }
     /// #
     /// # fn main() {}
     /// ```
     ///
     /// [`None`]: https://doc.rust-lang.org/std/option/enum.Option.html#variant.None
     </span><span class="kw">fn </span>serialize_none(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Serialize a [`Some(T)`] value.
     ///
     /// ```edition2018
     /// # use serde::{Serialize, Serializer};
     /// #
     /// # enum Option&lt;T&gt; {
     /// #     Some(T),
     /// #     None,
     /// # }
     /// #
     /// # use self::Option::{Some, None};
     /// #
     /// impl&lt;T&gt; Serialize for Option&lt;T&gt;
     /// where
     ///     T: Serialize,
     /// {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         match *self {
     ///             Some(ref value) =&gt; serializer.serialize_some(value),
     ///             None =&gt; serializer.serialize_none(),
     ///         }
     ///     }
     /// }
     /// #
     /// # fn main() {}
     /// ```
     ///
     /// [`Some(T)`]: https://doc.rust-lang.org/std/option/enum.Option.html#variant.Some
     </span><span class="kw">fn </span>serialize_some&lt;T: <span class="question-mark">?</span>Sized&gt;(<span class="self">self</span>, value: <span class="kw-2">&amp;</span>T) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;
     <span class="kw">where
         </span>T: Serialize;

     <span class="doccomment">/// Serialize a `()` value.
     ///
     /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
     /// #
     /// impl Serialize for () {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.serialize_unit()
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_unit(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Serialize a unit struct like `struct Unit` or `PhantomData&lt;T&gt;`.
     ///
     /// A reasonable implementation would be to forward to `serialize_unit`.
     ///
     /// ```edition2018
     /// use serde::{Serialize, Serializer};
     ///
     /// struct Nothing;
     ///
     /// impl Serialize for Nothing {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.serialize_unit_struct(&quot;Nothing&quot;)
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_unit_struct(<span class="self">self</span>, name: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Serialize a unit variant like `E::A` in `enum E { A, B }`.
     ///
     /// The `name` is the name of the enum, the `variant_index` is the index of
     /// this variant within the enum, and the `variant` is the name of the
     /// variant.
     ///
     /// ```edition2018
     /// use serde::{Serialize, Serializer};
     ///
     /// enum E {
     ///     A,
     ///     B,
     /// }
     ///
     /// impl Serialize for E {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         match *self {
     ///             E::A =&gt; serializer.serialize_unit_variant(&quot;E&quot;, 0, &quot;A&quot;),
     ///             E::B =&gt; serializer.serialize_unit_variant(&quot;E&quot;, 1, &quot;B&quot;),
     ///         }
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_unit_variant(
         <span class="self">self</span>,
         name: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,
         variant_index: u32,
         variant: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Serialize a newtype struct like `struct Millimeters(u8)`.
     ///
     /// Serializers are encouraged to treat newtype structs as insignificant
     /// wrappers around the data they contain. A reasonable implementation would
     /// be to forward to `value.serialize(self)`.
     ///
     /// ```edition2018
     /// use serde::{Serialize, Serializer};
     ///
     /// struct Millimeters(u8);
     ///
     /// impl Serialize for Millimeters {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.serialize_newtype_struct(&quot;Millimeters&quot;, &amp;self.0)
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_newtype_struct&lt;T: <span class="question-mark">?</span>Sized&gt;(
         <span class="self">self</span>,
         name: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,
         value: <span class="kw-2">&amp;</span>T,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;
     <span class="kw">where
         </span>T: Serialize;

     <span class="doccomment">/// Serialize a newtype variant like `E::N` in `enum E { N(u8) }`.
     ///
     /// The `name` is the name of the enum, the `variant_index` is the index of
     /// this variant within the enum, and the `variant` is the name of the
     /// variant. The `value` is the data contained within this newtype variant.
     ///
     /// ```edition2018
     /// use serde::{Serialize, Serializer};
     ///
     /// enum E {
     ///     M(String),
     ///     N(u8),
     /// }
     ///
     /// impl Serialize for E {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         match *self {
     ///             E::M(ref s) =&gt; serializer.serialize_newtype_variant(&quot;E&quot;, 0, &quot;M&quot;, s),
     ///             E::N(n) =&gt; serializer.serialize_newtype_variant(&quot;E&quot;, 1, &quot;N&quot;, &amp;n),
     ///         }
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_newtype_variant&lt;T: <span class="question-mark">?</span>Sized&gt;(
         <span class="self">self</span>,
         name: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,
         variant_index: u32,
         variant: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,
         value: <span class="kw-2">&amp;</span>T,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;
     <span class="kw">where
         </span>T: Serialize;

     <span class="doccomment">/// Begin to serialize a variably sized sequence. This call must be
     /// followed by zero or more calls to `serialize_element`, then a call to
     /// `end`.
     ///
     /// The argument is the number of elements in the sequence, which may or may
     /// not be computable before the sequence is iterated. Some serializers only
     /// support sequences whose length is known up front.
     ///
     /// ```edition2018
     /// # use std::marker::PhantomData;
     /// #
     /// # struct Vec&lt;T&gt;(PhantomData&lt;T&gt;);
     /// #
     /// # impl&lt;T&gt; Vec&lt;T&gt; {
     /// #     fn len(&amp;self) -&gt; usize {
     /// #         unimplemented!()
     /// #     }
     /// # }
     /// #
     /// # impl&lt;&#39;a, T&gt; IntoIterator for &amp;&#39;a Vec&lt;T&gt; {
     /// #     type Item = &amp;&#39;a T;
     /// #     type IntoIter = Box&lt;Iterator&lt;Item = &amp;&#39;a T&gt;&gt;;
     /// #
     /// #     fn into_iter(self) -&gt; Self::IntoIter {
     /// #         unimplemented!()
     /// #     }
     /// # }
     /// #
     /// use serde::ser::{Serialize, Serializer, SerializeSeq};
     ///
     /// impl&lt;T&gt; Serialize for Vec&lt;T&gt;
     /// where
     ///     T: Serialize,
     /// {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         let mut seq = serializer.serialize_seq(Some(self.len()))?;
     ///         for element in self {
     ///             seq.serialize_element(element)?;
     ///         }
     ///         seq.end()
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_seq(<span class="self">self</span>, len: <span class="prelude-ty">Option</span>&lt;usize&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::SerializeSeq, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Begin to serialize a statically sized sequence whose length will be
     /// known at deserialization time without looking at the serialized data.
     /// This call must be followed by zero or more calls to `serialize_element`,
     /// then a call to `end`.
     ///
     /// ```edition2018
     /// use serde::ser::{Serialize, Serializer, SerializeTuple};
     ///
     /// # mod fool {
     /// #     trait Serialize {}
     /// impl&lt;A, B, C&gt; Serialize for (A, B, C)
     /// #     {}
     /// # }
     /// #
     /// # struct Tuple3&lt;A, B, C&gt;(A, B, C);
     /// #
     /// # impl&lt;A, B, C&gt; Serialize for Tuple3&lt;A, B, C&gt;
     /// where
     ///     A: Serialize,
     ///     B: Serialize,
     ///     C: Serialize,
     /// {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         let mut tup = serializer.serialize_tuple(3)?;
     ///         tup.serialize_element(&amp;self.0)?;
     ///         tup.serialize_element(&amp;self.1)?;
     ///         tup.serialize_element(&amp;self.2)?;
     ///         tup.end()
     ///     }
     /// }
     /// ```
     ///
     /// ```edition2018
     /// use serde::ser::{Serialize, SerializeTuple, Serializer};
     ///
     /// const VRAM_SIZE: usize = 386;
     /// struct Vram([u16; VRAM_SIZE]);
     ///
     /// impl Serialize for Vram {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         let mut seq = serializer.serialize_tuple(VRAM_SIZE)?;
     ///         for element in &amp;self.0[..] {
     ///             seq.serialize_element(element)?;
     ///         }
     ///         seq.end()
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_tuple(<span class="self">self</span>, len: usize) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::SerializeTuple, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Begin to serialize a tuple struct like `struct Rgb(u8, u8, u8)`. This
     /// call must be followed by zero or more calls to `serialize_field`, then a
     /// call to `end`.
     ///
     /// The `name` is the name of the tuple struct and the `len` is the number
     /// of data fields that will be serialized.
     ///
     /// ```edition2018
     /// use serde::ser::{Serialize, SerializeTupleStruct, Serializer};
     ///
     /// struct Rgb(u8, u8, u8);
     ///
     /// impl Serialize for Rgb {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         let mut ts = serializer.serialize_tuple_struct(&quot;Rgb&quot;, 3)?;
     ///         ts.serialize_field(&amp;self.0)?;
     ///         ts.serialize_field(&amp;self.1)?;
     ///         ts.serialize_field(&amp;self.2)?;
     ///         ts.end()
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_tuple_struct(
         <span class="self">self</span>,
         name: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,
         len: usize,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::SerializeTupleStruct, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Begin to serialize a tuple variant like `E::T` in `enum E { T(u8, u8)
     /// }`. This call must be followed by zero or more calls to
     /// `serialize_field`, then a call to `end`.
     ///
     /// The `name` is the name of the enum, the `variant_index` is the index of
     /// this variant within the enum, the `variant` is the name of the variant,
     /// and the `len` is the number of data fields that will be serialized.
     ///
     /// ```edition2018
     /// use serde::ser::{Serialize, SerializeTupleVariant, Serializer};
     ///
     /// enum E {
     ///     T(u8, u8),
     ///     U(String, u32, u32),
     /// }
     ///
     /// impl Serialize for E {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         match *self {
     ///             E::T(ref a, ref b) =&gt; {
     ///                 let mut tv = serializer.serialize_tuple_variant(&quot;E&quot;, 0, &quot;T&quot;, 2)?;
     ///                 tv.serialize_field(a)?;
     ///                 tv.serialize_field(b)?;
     ///                 tv.end()
     ///             }
     ///             E::U(ref a, ref b, ref c) =&gt; {
     ///                 let mut tv = serializer.serialize_tuple_variant(&quot;E&quot;, 1, &quot;U&quot;, 3)?;
     ///                 tv.serialize_field(a)?;
     ///                 tv.serialize_field(b)?;
     ///                 tv.serialize_field(c)?;
     ///                 tv.end()
     ///             }
     ///         }
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_tuple_variant(
         <span class="self">self</span>,
         name: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,
         variant_index: u32,
         variant: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,
         len: usize,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::SerializeTupleVariant, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Begin to serialize a map. This call must be followed by zero or more
     /// calls to `serialize_key` and `serialize_value`, then a call to `end`.
     ///
     /// The argument is the number of elements in the map, which may or may not
     /// be computable before the map is iterated. Some serializers only support
     /// maps whose length is known up front.
     ///
     /// ```edition2018
     /// # use std::marker::PhantomData;
     /// #
     /// # struct HashMap&lt;K, V&gt;(PhantomData&lt;K&gt;, PhantomData&lt;V&gt;);
     /// #
     /// # impl&lt;K, V&gt; HashMap&lt;K, V&gt; {
     /// #     fn len(&amp;self) -&gt; usize {
     /// #         unimplemented!()
     /// #     }
     /// # }
     /// #
     /// # impl&lt;&#39;a, K, V&gt; IntoIterator for &amp;&#39;a HashMap&lt;K, V&gt; {
     /// #     type Item = (&amp;&#39;a K, &amp;&#39;a V);
     /// #     type IntoIter = Box&lt;Iterator&lt;Item = (&amp;&#39;a K, &amp;&#39;a V)&gt;&gt;;
     /// #
     /// #     fn into_iter(self) -&gt; Self::IntoIter {
     /// #         unimplemented!()
     /// #     }
     /// # }
     /// #
     /// use serde::ser::{Serialize, Serializer, SerializeMap};
     ///
     /// impl&lt;K, V&gt; Serialize for HashMap&lt;K, V&gt;
     /// where
     ///     K: Serialize,
     ///     V: Serialize,
     /// {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         let mut map = serializer.serialize_map(Some(self.len()))?;
     ///         for (k, v) in self {
     ///             map.serialize_entry(k, v)?;
     ///         }
     ///         map.end()
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_map(<span class="self">self</span>, len: <span class="prelude-ty">Option</span>&lt;usize&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::SerializeMap, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Begin to serialize a struct like `struct Rgb { r: u8, g: u8, b: u8 }`.
     /// This call must be followed by zero or more calls to `serialize_field`,
     /// then a call to `end`.
     ///
     /// The `name` is the name of the struct and the `len` is the number of
     /// data fields that will be serialized.
     ///
     /// ```edition2018
     /// use serde::ser::{Serialize, SerializeStruct, Serializer};
     ///
     /// struct Rgb {
     ///     r: u8,
     ///     g: u8,
     ///     b: u8,
     /// }
     ///
     /// impl Serialize for Rgb {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         let mut rgb = serializer.serialize_struct(&quot;Rgb&quot;, 3)?;
     ///         rgb.serialize_field(&quot;r&quot;, &amp;self.r)?;
     ///         rgb.serialize_field(&quot;g&quot;, &amp;self.g)?;
     ///         rgb.serialize_field(&quot;b&quot;, &amp;self.b)?;
     ///         rgb.end()
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_struct(
         <span class="self">self</span>,
         name: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,
         len: usize,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::SerializeStruct, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Begin to serialize a struct variant like `E::S` in `enum E { S { r: u8,
     /// g: u8, b: u8 } }`. This call must be followed by zero or more calls to
     /// `serialize_field`, then a call to `end`.
     ///
     /// The `name` is the name of the enum, the `variant_index` is the index of
     /// this variant within the enum, the `variant` is the name of the variant,
     /// and the `len` is the number of data fields that will be serialized.
     ///
     /// ```edition2018
     /// use serde::ser::{Serialize, SerializeStructVariant, Serializer};
     ///
     /// enum E {
     ///     S { r: u8, g: u8, b: u8 },
     /// }
     ///
     /// impl Serialize for E {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         match *self {
     ///             E::S {
     ///                 ref r,
     ///                 ref g,
     ///                 ref b,
     ///             } =&gt; {
     ///                 let mut sv = serializer.serialize_struct_variant(&quot;E&quot;, 0, &quot;S&quot;, 3)?;
     ///                 sv.serialize_field(&quot;r&quot;, r)?;
     ///                 sv.serialize_field(&quot;g&quot;, g)?;
     ///                 sv.serialize_field(&quot;b&quot;, b)?;
     ///                 sv.end()
     ///             }
     ///         }
     ///     }
     /// }
     /// ```
     </span><span class="kw">fn </span>serialize_struct_variant(
         <span class="self">self</span>,
         name: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,
         variant_index: u32,
         variant: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,
         len: usize,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::SerializeStructVariant, <span class="self">Self</span>::Error&gt;;

     <span class="doccomment">/// Collect an iterator as a sequence.
     ///
     /// The default implementation serializes each item yielded by the iterator
     /// using [`serialize_seq`]. Implementors should not need to override this
     /// method.
     ///
     /// ```edition2018
     /// use serde::{Serialize, Serializer};
     ///
     /// struct SecretlyOneHigher {
     ///     data: Vec&lt;i32&gt;,
     /// }
     ///
     /// impl Serialize for SecretlyOneHigher {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.collect_seq(self.data.iter().map(|x| x + 1))
     ///     }
     /// }
     /// ```
     ///
     /// [`serialize_seq`]: #tymethod.serialize_seq
     </span><span class="kw">fn </span>collect_seq&lt;I&gt;(<span class="self">self</span>, iter: I) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;
     <span class="kw">where
         </span>I: IntoIterator,
         &lt;I <span class="kw">as </span>IntoIterator&gt;::Item: Serialize,
     {
         <span class="kw">let </span>iter = iter.into_iter();
         <span class="kw">let </span><span class="kw-2">mut </span>serializer = <span class="macro">try!</span>(<span class="self">self</span>.serialize_seq(iterator_len_hint(<span class="kw-2">&amp;</span>iter)));

         <span class="attribute">#[cfg(not(no_iterator_try_fold))]
         </span>{
             <span class="kw">let </span><span class="kw-2">mut </span>iter = iter;
             <span class="macro">try!</span>(iter.try_for_each(|item| serializer.serialize_element(<span class="kw-2">&amp;</span>item)));
         }

         <span class="attribute">#[cfg(no_iterator_try_fold)]
         </span>{
             <span class="kw">for </span>item <span class="kw">in </span>iter {
                 <span class="macro">try!</span>(serializer.serialize_element(<span class="kw-2">&amp;</span>item));
             }
         }

         serializer.end()
     }

     <span class="doccomment">/// Collect an iterator as a map.
     ///
     /// The default implementation serializes each pair yielded by the iterator
     /// using [`serialize_map`]. Implementors should not need to override this
     /// method.
     ///
     /// ```edition2018
     /// use serde::{Serialize, Serializer};
     /// use std::collections::BTreeSet;
     ///
     /// struct MapToUnit {
     ///     keys: BTreeSet&lt;i32&gt;,
     /// }
     ///
     /// // Serializes as a map in which the values are all unit.
     /// impl Serialize for MapToUnit {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.collect_map(self.keys.iter().map(|k| (k, ())))
     ///     }
     /// }
     /// ```
     ///
     /// [`serialize_map`]: #tymethod.serialize_map
     </span><span class="kw">fn </span>collect_map&lt;K, V, I&gt;(<span class="self">self</span>, iter: I) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;
     <span class="kw">where
         </span>K: Serialize,
         V: Serialize,
         I: IntoIterator&lt;Item = (K, V)&gt;,
     {
         <span class="kw">let </span>iter = iter.into_iter();
         <span class="kw">let </span><span class="kw-2">mut </span>serializer = <span class="macro">try!</span>(<span class="self">self</span>.serialize_map(iterator_len_hint(<span class="kw-2">&amp;</span>iter)));

         <span class="attribute">#[cfg(not(no_iterator_try_fold))]
         </span>{
             <span class="kw">let </span><span class="kw-2">mut </span>iter = iter;
             <span class="macro">try!</span>(iter.try_for_each(|(key, value)| serializer.serialize_entry(<span class="kw-2">&amp;</span>key, <span class="kw-2">&amp;</span>value)));
         }

         <span class="attribute">#[cfg(no_iterator_try_fold)]
         </span>{
             <span class="kw">for </span>(key, value) <span class="kw">in </span>iter {
                 <span class="macro">try!</span>(serializer.serialize_entry(<span class="kw-2">&amp;</span>key, <span class="kw-2">&amp;</span>value));
             }
         }

         serializer.end()
     }

     <span class="doccomment">/// Serialize a string produced by an implementation of `Display`.
     ///
     /// The default implementation builds a heap-allocated [`String`] and
     /// delegates to [`serialize_str`]. Serializers are encouraged to provide a
     /// more efficient implementation if possible.
     ///
     /// ```edition2018
     /// # struct DateTime;
     /// #
     /// # impl DateTime {
     /// #     fn naive_local(&amp;self) -&gt; () { () }
     /// #     fn offset(&amp;self) -&gt; () { () }
     /// # }
     /// #
     /// use serde::{Serialize, Serializer};
     ///
     /// impl Serialize for DateTime {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.collect_str(&amp;format_args!(&quot;{:?}{:?}&quot;,
     ///                                              self.naive_local(),
     ///                                              self.offset()))
     ///     }
     /// }
     /// ```
     ///
     /// [`String`]: https://doc.rust-lang.org/std/string/struct.String.html
     /// [`serialize_str`]: #tymethod.serialize_str
     </span><span class="attribute">#[cfg(any(feature = <span class="string">&quot;std&quot;</span>, feature = <span class="string">&quot;alloc&quot;</span>))]
     </span><span class="kw">fn </span>collect_str&lt;T: <span class="question-mark">?</span>Sized&gt;(<span class="self">self</span>, value: <span class="kw-2">&amp;</span>T) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;
     <span class="kw">where
         </span>T: Display,
     {
         <span class="self">self</span>.serialize_str(<span class="kw-2">&amp;</span>value.to_string())
     }

     <span class="doccomment">/// Serialize a string produced by an implementation of `Display`.
     ///
     /// Serializers that use `no_std` are required to provide an implementation
     /// of this method. If no more sensible behavior is possible, the
     /// implementation is expected to return an error.
     ///
     /// ```edition2018
     /// # struct DateTime;
     /// #
     /// # impl DateTime {
     /// #     fn naive_local(&amp;self) -&gt; () { () }
     /// #     fn offset(&amp;self) -&gt; () { () }
     /// # }
     /// #
     /// use serde::{Serialize, Serializer};
     ///
     /// impl Serialize for DateTime {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         serializer.collect_str(&amp;format_args!(&quot;{:?}{:?}&quot;,
     ///                                              self.naive_local(),
     ///                                              self.offset()))
     ///     }
     /// }
     /// ```
     </span><span class="attribute">#[cfg(not(any(feature = <span class="string">&quot;std&quot;</span>, feature = <span class="string">&quot;alloc&quot;</span>)))]
     </span><span class="kw">fn </span>collect_str&lt;T: <span class="question-mark">?</span>Sized&gt;(<span class="self">self</span>, value: <span class="kw-2">&amp;</span>T) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;
     <span class="kw">where
         </span>T: Display;

     <span class="doccomment">/// Determine whether `Serialize` implementations should serialize in
     /// human-readable form.
     ///
     /// Some types have a human-readable form that may be somewhat expensive to
     /// construct, as well as a binary form that is compact and efficient.
     /// Generally text-based formats like JSON and YAML will prefer to use the
     /// human-readable one and binary formats like Postcard will prefer the
     /// compact one.
     ///
     /// ```edition2018
     /// # use std::fmt::{self, Display};
     /// #
     /// # struct Timestamp;
     /// #
     /// # impl Timestamp {
     /// #     fn seconds_since_epoch(&amp;self) -&gt; u64 { unimplemented!() }
     /// # }
     /// #
     /// # impl Display for Timestamp {
     /// #     fn fmt(&amp;self, formatter: &amp;mut fmt::Formatter) -&gt; fmt::Result {
     /// #         unimplemented!()
     /// #     }
     /// # }
     /// #
     /// use serde::{Serialize, Serializer};
     ///
     /// impl Serialize for Timestamp {
     ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
     ///     where
     ///         S: Serializer,
     ///     {
     ///         if serializer.is_human_readable() {
     ///             // Serialize to a human-readable string &quot;2015-05-15T17:01:00Z&quot;.
     ///             self.to_string().serialize(serializer)
     ///         } else {
     ///             // Serialize to a compact binary representation.
     ///             self.seconds_since_epoch().serialize(serializer)
     ///         }
     ///     }
     /// }
     /// ```
     ///
     /// The default implementation of this method returns `true`. Data formats
     /// may override this to `false` to request a compact form for types that
     /// support one. Note that modifying this method to change a format from
     /// human-readable to compact or vice versa should be regarded as a breaking
     /// change, as a value serialized in human-readable mode is not required to
     /// deserialize from the same data in compact mode.
     </span><span class="attribute">#[inline]
     </span><span class="kw">fn </span>is_human_readable(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="bool-val">true
     </span>}
 }

 <span class="doccomment">/// Returned from `Serializer::serialize_seq`.
 ///
 /// # Example use
 ///
 /// ```edition2018
 /// # use std::marker::PhantomData;
 /// #
 /// # struct Vec&lt;T&gt;(PhantomData&lt;T&gt;);
 /// #
 /// # impl&lt;T&gt; Vec&lt;T&gt; {
 /// #     fn len(&amp;self) -&gt; usize {
 /// #         unimplemented!()
 /// #     }
 /// # }
 /// #
 /// # impl&lt;&#39;a, T&gt; IntoIterator for &amp;&#39;a Vec&lt;T&gt; {
 /// #     type Item = &amp;&#39;a T;
 /// #     type IntoIter = Box&lt;Iterator&lt;Item = &amp;&#39;a T&gt;&gt;;
 /// #     fn into_iter(self) -&gt; Self::IntoIter {
 /// #         unimplemented!()
 /// #     }
 /// # }
 /// #
 /// use serde::ser::{Serialize, Serializer, SerializeSeq};
 ///
 /// impl&lt;T&gt; Serialize for Vec&lt;T&gt;
 /// where
 ///     T: Serialize,
 /// {
 ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
 ///     where
 ///         S: Serializer,
 ///     {
 ///         let mut seq = serializer.serialize_seq(Some(self.len()))?;
 ///         for element in self {
 ///             seq.serialize_element(element)?;
 ///         }
 ///         seq.end()
 ///     }
 /// }
 /// ```
 ///
 /// # Example implementation
 ///
 /// The [example data format] presented on the website demonstrates an
 /// implementation of `SerializeSeq` for a basic JSON data format.
 ///
 /// [example data format]: https://serde.rs/data-format.html
 </span><span class="kw">pub trait </span>SerializeSeq {
     <span class="doccomment">/// Must match the `Ok` type of our `Serializer`.
     </span><span class="kw">type </span><span class="prelude-val">Ok</span>;

     <span class="doccomment">/// Must match the `Error` type of our `Serializer`.
     </span><span class="kw">type </span>Error: Error;

     <span class="doccomment">/// Serialize a sequence element.
     </span><span class="kw">fn </span>serialize_element&lt;T: <span class="question-mark">?</span>Sized&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: <span class="kw-2">&amp;</span>T) -&gt; <span class="prelude-ty">Result</span>&lt;(), <span class="self">Self</span>::Error&gt;
     <span class="kw">where
         </span>T: Serialize;

     <span class="doccomment">/// Finish serializing a sequence.
     </span><span class="kw">fn </span>end(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;
 }

 <span class="doccomment">/// Returned from `Serializer::serialize_tuple`.
 ///
 /// # Example use
 ///
 /// ```edition2018
 /// use serde::ser::{Serialize, Serializer, SerializeTuple};
 ///
 /// # mod fool {
 /// #     trait Serialize {}
 /// impl&lt;A, B, C&gt; Serialize for (A, B, C)
 /// #     {}
 /// # }
 /// #
 /// # struct Tuple3&lt;A, B, C&gt;(A, B, C);
 /// #
 /// # impl&lt;A, B, C&gt; Serialize for Tuple3&lt;A, B, C&gt;
 /// where
 ///     A: Serialize,
 ///     B: Serialize,
 ///     C: Serialize,
 /// {
 ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
 ///     where
 ///         S: Serializer,
 ///     {
 ///         let mut tup = serializer.serialize_tuple(3)?;
 ///         tup.serialize_element(&amp;self.0)?;
 ///         tup.serialize_element(&amp;self.1)?;
 ///         tup.serialize_element(&amp;self.2)?;
 ///         tup.end()
 ///     }
 /// }
 /// ```
 ///
 /// ```edition2018
 /// # use std::marker::PhantomData;
 /// #
 /// # struct Array&lt;T&gt;(PhantomData&lt;T&gt;);
 /// #
 /// # impl&lt;T&gt; Array&lt;T&gt; {
 /// #     fn len(&amp;self) -&gt; usize {
 /// #         unimplemented!()
 /// #     }
 /// # }
 /// #
 /// # impl&lt;&#39;a, T&gt; IntoIterator for &amp;&#39;a Array&lt;T&gt; {
 /// #     type Item = &amp;&#39;a T;
 /// #     type IntoIter = Box&lt;Iterator&lt;Item = &amp;&#39;a T&gt;&gt;;
 /// #     fn into_iter(self) -&gt; Self::IntoIter {
 /// #         unimplemented!()
 /// #     }
 /// # }
 /// #
 /// use serde::ser::{Serialize, Serializer, SerializeTuple};
 ///
 /// # mod fool {
 /// #     trait Serialize {}
 /// impl&lt;T&gt; Serialize for [T; 16]
 /// #     {}
 /// # }
 /// #
 /// # impl&lt;T&gt; Serialize for Array&lt;T&gt;
 /// where
 ///     T: Serialize,
 /// {
 ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
 ///     where
 ///         S: Serializer,
 ///     {
 ///         let mut seq = serializer.serialize_tuple(16)?;
 ///         for element in self {
 ///             seq.serialize_element(element)?;
 ///         }
 ///         seq.end()
 ///     }
 /// }
 /// ```
 ///
 /// # Example implementation
 ///
 /// The [example data format] presented on the website demonstrates an
 /// implementation of `SerializeTuple` for a basic JSON data format.
 ///
 /// [example data format]: https://serde.rs/data-format.html
 </span><span class="kw">pub trait </span>SerializeTuple {
     <span class="doccomment">/// Must match the `Ok` type of our `Serializer`.
     </span><span class="kw">type </span><span class="prelude-val">Ok</span>;

     <span class="doccomment">/// Must match the `Error` type of our `Serializer`.
     </span><span class="kw">type </span>Error: Error;

     <span class="doccomment">/// Serialize a tuple element.
     </span><span class="kw">fn </span>serialize_element&lt;T: <span class="question-mark">?</span>Sized&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: <span class="kw-2">&amp;</span>T) -&gt; <span class="prelude-ty">Result</span>&lt;(), <span class="self">Self</span>::Error&gt;
     <span class="kw">where
         </span>T: Serialize;

     <span class="doccomment">/// Finish serializing a tuple.
     </span><span class="kw">fn </span>end(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;
 }

 <span class="doccomment">/// Returned from `Serializer::serialize_tuple_struct`.
 ///
 /// # Example use
 ///
 /// ```edition2018
 /// use serde::ser::{Serialize, SerializeTupleStruct, Serializer};
 ///
 /// struct Rgb(u8, u8, u8);
 ///
 /// impl Serialize for Rgb {
 ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
 ///     where
 ///         S: Serializer,
 ///     {
 ///         let mut ts = serializer.serialize_tuple_struct(&quot;Rgb&quot;, 3)?;
 ///         ts.serialize_field(&amp;self.0)?;
 ///         ts.serialize_field(&amp;self.1)?;
 ///         ts.serialize_field(&amp;self.2)?;
 ///         ts.end()
 ///     }
 /// }
 /// ```
 ///
 /// # Example implementation
 ///
 /// The [example data format] presented on the website demonstrates an
 /// implementation of `SerializeTupleStruct` for a basic JSON data format.
 ///
 /// [example data format]: https://serde.rs/data-format.html
 </span><span class="kw">pub trait </span>SerializeTupleStruct {
     <span class="doccomment">/// Must match the `Ok` type of our `Serializer`.
     </span><span class="kw">type </span><span class="prelude-val">Ok</span>;

     <span class="doccomment">/// Must match the `Error` type of our `Serializer`.
     </span><span class="kw">type </span>Error: Error;

     <span class="doccomment">/// Serialize a tuple struct field.
     </span><span class="kw">fn </span>serialize_field&lt;T: <span class="question-mark">?</span>Sized&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: <span class="kw-2">&amp;</span>T) -&gt; <span class="prelude-ty">Result</span>&lt;(), <span class="self">Self</span>::Error&gt;
     <span class="kw">where
         </span>T: Serialize;

     <span class="doccomment">/// Finish serializing a tuple struct.
     </span><span class="kw">fn </span>end(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;
 }

 <span class="doccomment">/// Returned from `Serializer::serialize_tuple_variant`.
 ///
 /// # Example use
 ///
 /// ```edition2018
 /// use serde::ser::{Serialize, SerializeTupleVariant, Serializer};
 ///
 /// enum E {
 ///     T(u8, u8),
 ///     U(String, u32, u32),
 /// }
 ///
 /// impl Serialize for E {
 ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
 ///     where
 ///         S: Serializer,
 ///     {
 ///         match *self {
 ///             E::T(ref a, ref b) =&gt; {
 ///                 let mut tv = serializer.serialize_tuple_variant(&quot;E&quot;, 0, &quot;T&quot;, 2)?;
 ///                 tv.serialize_field(a)?;
 ///                 tv.serialize_field(b)?;
 ///                 tv.end()
 ///             }
 ///             E::U(ref a, ref b, ref c) =&gt; {
 ///                 let mut tv = serializer.serialize_tuple_variant(&quot;E&quot;, 1, &quot;U&quot;, 3)?;
 ///                 tv.serialize_field(a)?;
 ///                 tv.serialize_field(b)?;
 ///                 tv.serialize_field(c)?;
 ///                 tv.end()
 ///             }
 ///         }
 ///     }
 /// }
 /// ```
 ///
 /// # Example implementation
 ///
 /// The [example data format] presented on the website demonstrates an
 /// implementation of `SerializeTupleVariant` for a basic JSON data format.
 ///
 /// [example data format]: https://serde.rs/data-format.html
 </span><span class="kw">pub trait </span>SerializeTupleVariant {
     <span class="doccomment">/// Must match the `Ok` type of our `Serializer`.
     </span><span class="kw">type </span><span class="prelude-val">Ok</span>;

     <span class="doccomment">/// Must match the `Error` type of our `Serializer`.
     </span><span class="kw">type </span>Error: Error;

     <span class="doccomment">/// Serialize a tuple variant field.
     </span><span class="kw">fn </span>serialize_field&lt;T: <span class="question-mark">?</span>Sized&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: <span class="kw-2">&amp;</span>T) -&gt; <span class="prelude-ty">Result</span>&lt;(), <span class="self">Self</span>::Error&gt;
     <span class="kw">where
         </span>T: Serialize;

     <span class="doccomment">/// Finish serializing a tuple variant.
     </span><span class="kw">fn </span>end(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;
 }

 <span class="doccomment">/// Returned from `Serializer::serialize_map`.
 ///
 /// # Example use
 ///
 /// ```edition2018
 /// # use std::marker::PhantomData;
 /// #
 /// # struct HashMap&lt;K, V&gt;(PhantomData&lt;K&gt;, PhantomData&lt;V&gt;);
 /// #
 /// # impl&lt;K, V&gt; HashMap&lt;K, V&gt; {
 /// #     fn len(&amp;self) -&gt; usize {
 /// #         unimplemented!()
 /// #     }
 /// # }
 /// #
 /// # impl&lt;&#39;a, K, V&gt; IntoIterator for &amp;&#39;a HashMap&lt;K, V&gt; {
 /// #     type Item = (&amp;&#39;a K, &amp;&#39;a V);
 /// #     type IntoIter = Box&lt;Iterator&lt;Item = (&amp;&#39;a K, &amp;&#39;a V)&gt;&gt;;
 /// #
 /// #     fn into_iter(self) -&gt; Self::IntoIter {
 /// #         unimplemented!()
 /// #     }
 /// # }
 /// #
 /// use serde::ser::{Serialize, Serializer, SerializeMap};
 ///
 /// impl&lt;K, V&gt; Serialize for HashMap&lt;K, V&gt;
 /// where
 ///     K: Serialize,
 ///     V: Serialize,
 /// {
 ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
 ///     where
 ///         S: Serializer,
 ///     {
 ///         let mut map = serializer.serialize_map(Some(self.len()))?;
 ///         for (k, v) in self {
 ///             map.serialize_entry(k, v)?;
 ///         }
 ///         map.end()
 ///     }
 /// }
 /// ```
 ///
 /// # Example implementation
 ///
 /// The [example data format] presented on the website demonstrates an
 /// implementation of `SerializeMap` for a basic JSON data format.
 ///
 /// [example data format]: https://serde.rs/data-format.html
 </span><span class="kw">pub trait </span>SerializeMap {
     <span class="doccomment">/// Must match the `Ok` type of our `Serializer`.
     </span><span class="kw">type </span><span class="prelude-val">Ok</span>;

     <span class="doccomment">/// Must match the `Error` type of our `Serializer`.
     </span><span class="kw">type </span>Error: Error;

     <span class="doccomment">/// Serialize a map key.
     ///
     /// If possible, `Serialize` implementations are encouraged to use
     /// `serialize_entry` instead as it may be implemented more efficiently in
     /// some formats compared to a pair of calls to `serialize_key` and
     /// `serialize_value`.
     </span><span class="kw">fn </span>serialize_key&lt;T: <span class="question-mark">?</span>Sized&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, key: <span class="kw-2">&amp;</span>T) -&gt; <span class="prelude-ty">Result</span>&lt;(), <span class="self">Self</span>::Error&gt;
     <span class="kw">where
         </span>T: Serialize;

     <span class="doccomment">/// Serialize a map value.
     ///
     /// # Panics
     ///
     /// Calling `serialize_value` before `serialize_key` is incorrect and is
     /// allowed to panic or produce bogus results.
     </span><span class="kw">fn </span>serialize_value&lt;T: <span class="question-mark">?</span>Sized&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, value: <span class="kw-2">&amp;</span>T) -&gt; <span class="prelude-ty">Result</span>&lt;(), <span class="self">Self</span>::Error&gt;
     <span class="kw">where
         </span>T: Serialize;

     <span class="doccomment">/// Serialize a map entry consisting of a key and a value.
     ///
     /// Some [`Serialize`] types are not able to hold a key and value in memory
     /// at the same time so `SerializeMap` implementations are required to
     /// support [`serialize_key`] and [`serialize_value`] individually. The
     /// `serialize_entry` method allows serializers to optimize for the case
     /// where key and value are both available. [`Serialize`] implementations
     /// are encouraged to use `serialize_entry` if possible.
     ///
     /// The default implementation delegates to [`serialize_key`] and
     /// [`serialize_value`]. This is appropriate for serializers that do not
     /// care about performance or are not able to optimize `serialize_entry` any
     /// better than this.
     ///
     /// [`Serialize`]: ../trait.Serialize.html
     /// [`serialize_key`]: #tymethod.serialize_key
     /// [`serialize_value`]: #tymethod.serialize_value
     </span><span class="kw">fn </span>serialize_entry&lt;K: <span class="question-mark">?</span>Sized, V: <span class="question-mark">?</span>Sized&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         key: <span class="kw-2">&amp;</span>K,
         value: <span class="kw-2">&amp;</span>V,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;(), <span class="self">Self</span>::Error&gt;
     <span class="kw">where
         </span>K: Serialize,
         V: Serialize,
     {
         <span class="macro">try!</span>(<span class="self">self</span>.serialize_key(key));
         <span class="self">self</span>.serialize_value(value)
     }

     <span class="doccomment">/// Finish serializing a map.
     </span><span class="kw">fn </span>end(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;
 }

 <span class="doccomment">/// Returned from `Serializer::serialize_struct`.
 ///
 /// # Example use
 ///
 /// ```edition2018
 /// use serde::ser::{Serialize, SerializeStruct, Serializer};
 ///
 /// struct Rgb {
 ///     r: u8,
 ///     g: u8,
 ///     b: u8,
 /// }
 ///
 /// impl Serialize for Rgb {
 ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
 ///     where
 ///         S: Serializer,
 ///     {
 ///         let mut rgb = serializer.serialize_struct(&quot;Rgb&quot;, 3)?;
 ///         rgb.serialize_field(&quot;r&quot;, &amp;self.r)?;
 ///         rgb.serialize_field(&quot;g&quot;, &amp;self.g)?;
 ///         rgb.serialize_field(&quot;b&quot;, &amp;self.b)?;
 ///         rgb.end()
 ///     }
 /// }
 /// ```
 ///
 /// # Example implementation
 ///
 /// The [example data format] presented on the website demonstrates an
 /// implementation of `SerializeStruct` for a basic JSON data format.
 ///
 /// [example data format]: https://serde.rs/data-format.html
 </span><span class="kw">pub trait </span>SerializeStruct {
     <span class="doccomment">/// Must match the `Ok` type of our `Serializer`.
     </span><span class="kw">type </span><span class="prelude-val">Ok</span>;

     <span class="doccomment">/// Must match the `Error` type of our `Serializer`.
     </span><span class="kw">type </span>Error: Error;

     <span class="doccomment">/// Serialize a struct field.
     </span><span class="kw">fn </span>serialize_field&lt;T: <span class="question-mark">?</span>Sized&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         key: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,
         value: <span class="kw-2">&amp;</span>T,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;(), <span class="self">Self</span>::Error&gt;
     <span class="kw">where
         </span>T: Serialize;

     <span class="doccomment">/// Indicate that a struct field has been skipped.
     </span><span class="attribute">#[inline]
     </span><span class="kw">fn </span>skip_field(<span class="kw-2">&amp;mut </span><span class="self">self</span>, key: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str) -&gt; <span class="prelude-ty">Result</span>&lt;(), <span class="self">Self</span>::Error&gt; {
         <span class="kw">let _ </span>= key;
         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Finish serializing a struct.
     </span><span class="kw">fn </span>end(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;
 }

 <span class="doccomment">/// Returned from `Serializer::serialize_struct_variant`.
 ///
 /// # Example use
 ///
 /// ```edition2018
 /// use serde::ser::{Serialize, SerializeStructVariant, Serializer};
 ///
 /// enum E {
 ///     S { r: u8, g: u8, b: u8 },
 /// }
 ///
 /// impl Serialize for E {
 ///     fn serialize&lt;S&gt;(&amp;self, serializer: S) -&gt; Result&lt;S::Ok, S::Error&gt;
 ///     where
 ///         S: Serializer,
 ///     {
 ///         match *self {
 ///             E::S {
 ///                 ref r,
 ///                 ref g,
 ///                 ref b,
 ///             } =&gt; {
 ///                 let mut sv = serializer.serialize_struct_variant(&quot;E&quot;, 0, &quot;S&quot;, 3)?;
 ///                 sv.serialize_field(&quot;r&quot;, r)?;
 ///                 sv.serialize_field(&quot;g&quot;, g)?;
 ///                 sv.serialize_field(&quot;b&quot;, b)?;
 ///                 sv.end()
 ///             }
 ///         }
 ///     }
 /// }
 /// ```
 ///
 /// # Example implementation
 ///
 /// The [example data format] presented on the website demonstrates an
 /// implementation of `SerializeStructVariant` for a basic JSON data format.
 ///
 /// [example data format]: https://serde.rs/data-format.html
 </span><span class="kw">pub trait </span>SerializeStructVariant {
     <span class="doccomment">/// Must match the `Ok` type of our `Serializer`.
     </span><span class="kw">type </span><span class="prelude-val">Ok</span>;

     <span class="doccomment">/// Must match the `Error` type of our `Serializer`.
     </span><span class="kw">type </span>Error: Error;

     <span class="doccomment">/// Serialize a struct variant field.
     </span><span class="kw">fn </span>serialize_field&lt;T: <span class="question-mark">?</span>Sized&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         key: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,
         value: <span class="kw-2">&amp;</span>T,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;(), <span class="self">Self</span>::Error&gt;
     <span class="kw">where
         </span>T: Serialize;

     <span class="doccomment">/// Indicate that a struct variant field has been skipped.
     </span><span class="attribute">#[inline]
     </span><span class="kw">fn </span>skip_field(<span class="kw-2">&amp;mut </span><span class="self">self</span>, key: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str) -&gt; <span class="prelude-ty">Result</span>&lt;(), <span class="self">Self</span>::Error&gt; {
         <span class="kw">let _ </span>= key;
         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Finish serializing a struct variant.
     </span><span class="kw">fn </span>end(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;;
 }

 <span class="kw">fn </span>iterator_len_hint&lt;I&gt;(iter: <span class="kw-2">&amp;</span>I) -&gt; <span class="prelude-ty">Option</span>&lt;usize&gt;
 <span class="kw">where
     </span>I: Iterator,
 {
     <span class="kw">match </span>iter.size_hint() {
         (lo, <span class="prelude-val">Some</span>(hi)) <span class="kw">if </span>lo == hi =&gt; <span class="prelude-val">Some</span>(lo),
         <span class="kw">_ </span>=&gt; <span class="prelude-val">None</span>,
     }
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="serde" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>