459 lines
13 KiB
Rust
459 lines
13 KiB
Rust
//! Support for Serde serialization of Rust data types into Preserves terms.
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use super::value::boundary as B;
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use super::value::writer::{CompoundWriter, Writer};
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use super::value::IOValueDomainCodec;
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use serde::Serialize;
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pub use super::error::Error;
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type Result<T> = std::result::Result<T, Error>;
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#[derive(Debug)]
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/// Serde serializer for Preserves-encoding Rust data. Construct via [Serializer::new], and use
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/// with [serde::Serialize::serialize] methods.
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pub struct Serializer<'w, W: Writer> {
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/// The underlying Preserves [writer][crate::value::writer::Writer].
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pub write: &'w mut W,
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}
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impl<'w, W: Writer> Serializer<'w, W> {
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/// Construct a new [Serializer] targetting the given
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/// [writer][crate::value::writer::Writer].
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pub fn new(write: &'w mut W) -> Self {
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Serializer { write }
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}
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}
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enum SequenceVariant<W: Writer> {
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Sequence(W::SeqWriter),
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Record(W::RecWriter),
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}
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#[doc(hidden)]
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pub struct SerializeCompound<'a, 'w, W: Writer> {
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b: B::Type,
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i: B::Item,
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ser: &'a mut Serializer<'w, W>,
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c: SequenceVariant<W>,
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}
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#[doc(hidden)]
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pub struct SerializeDictionary<'a, 'w, W: Writer> {
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b: B::Type,
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ser: &'a mut Serializer<'w, W>,
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d: W::DictWriter,
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}
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impl<'a, 'w, W: Writer> serde::Serializer for &'a mut Serializer<'w, W> {
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type Ok = ();
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type Error = Error;
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type SerializeSeq = SerializeCompound<'a, 'w, W>;
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type SerializeTuple = SerializeCompound<'a, 'w, W>;
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type SerializeTupleStruct = SerializeCompound<'a, 'w, W>;
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type SerializeTupleVariant = SerializeCompound<'a, 'w, W>;
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type SerializeMap = SerializeDictionary<'a, 'w, W>;
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type SerializeStruct = SerializeCompound<'a, 'w, W>;
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type SerializeStructVariant = SerializeCompound<'a, 'w, W>;
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fn serialize_bool(self, v: bool) -> Result<Self::Ok> {
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Ok(self.write.write_bool(v)?)
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}
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fn serialize_i8(self, v: i8) -> Result<Self::Ok> {
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Ok(self.write.write_i8(v)?)
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}
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fn serialize_i16(self, v: i16) -> Result<Self::Ok> {
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Ok(self.write.write_i16(v)?)
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}
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fn serialize_i32(self, v: i32) -> Result<Self::Ok> {
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Ok(self.write.write_i32(v)?)
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}
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fn serialize_i64(self, v: i64) -> Result<Self::Ok> {
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Ok(self.write.write_i64(v)?)
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}
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fn serialize_u8(self, v: u8) -> Result<Self::Ok> {
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Ok(self.write.write_u8(v)?)
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}
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fn serialize_u16(self, v: u16) -> Result<Self::Ok> {
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Ok(self.write.write_u16(v)?)
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}
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fn serialize_u32(self, v: u32) -> Result<Self::Ok> {
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Ok(self.write.write_u32(v)?)
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}
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fn serialize_u64(self, v: u64) -> Result<Self::Ok> {
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Ok(self.write.write_u64(v)?)
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}
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fn serialize_f32(self, v: f32) -> Result<Self::Ok> {
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Ok(self.write.write_f64(v as f64)?)
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}
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fn serialize_f64(self, v: f64) -> Result<Self::Ok> {
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Ok(self.write.write_f64(v)?)
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}
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fn serialize_char(self, v: char) -> Result<Self::Ok> {
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let mut c = self.write.start_record(Some(1))?;
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c.boundary(&B::start(B::Item::RecordLabel))?;
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c.write_symbol("UnicodeScalar")?;
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c.boundary(&B::mid(B::Item::RecordLabel, B::Item::RecordField))?;
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c.write_u32(v as u32)?;
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c.boundary(&B::end(B::Item::RecordField))?;
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Ok(self.write.end_record(c)?)
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}
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fn serialize_str(self, v: &str) -> Result<Self::Ok> {
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Ok(self.write.write_string(v)?)
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}
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fn serialize_bytes(self, v: &[u8]) -> Result<Self::Ok> {
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Ok(self.write.write_bytes(v)?)
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}
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fn serialize_none(self) -> Result<Self::Ok> {
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let mut c = self.write.start_record(Some(0))?;
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c.boundary(&B::start(B::Item::RecordLabel))?;
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c.write_symbol("None")?;
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c.boundary(&B::end(B::Item::RecordLabel))?;
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Ok(self.write.end_record(c)?)
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}
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fn serialize_some<T: ?Sized>(self, v: &T) -> Result<Self::Ok>
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where
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T: Serialize,
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{
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let mut c = self.write.start_record(Some(1))?;
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c.boundary(&B::start(B::Item::RecordLabel))?;
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c.write_symbol("Some")?;
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c.boundary(&B::mid(B::Item::RecordLabel, B::Item::RecordField))?;
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to_writer(&mut c, v)?;
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c.boundary(&B::end(B::Item::RecordField))?;
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Ok(self.write.end_record(c)?)
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}
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fn serialize_unit(self) -> Result<Self::Ok> {
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let mut c = self.write.start_record(Some(0))?;
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c.boundary(&B::start(B::Item::RecordLabel))?;
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c.write_symbol("tuple")?;
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c.boundary(&B::end(B::Item::RecordLabel))?;
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Ok(self.write.end_record(c)?)
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}
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fn serialize_unit_struct(self, name: &'static str) -> Result<Self::Ok> {
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let mut c = self.write.start_record(Some(0))?;
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c.boundary(&B::start(B::Item::RecordLabel))?;
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c.write_symbol(name)?;
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c.boundary(&B::end(B::Item::RecordLabel))?;
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Ok(self.write.end_record(c)?)
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}
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fn serialize_unit_variant(
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self,
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_name: &'static str,
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_variant: u32,
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variant_name: &'static str,
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) -> Result<Self::Ok> {
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let mut c = self.write.start_record(Some(0))?;
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c.boundary(&B::start(B::Item::RecordLabel))?;
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c.write_symbol(variant_name)?;
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c.boundary(&B::end(B::Item::RecordLabel))?;
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Ok(self.write.end_record(c)?)
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}
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fn serialize_newtype_struct<T: ?Sized>(self, name: &'static str, value: &T) -> Result<Self::Ok>
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where
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T: Serialize,
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{
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match super::value::magic::receive_output_value(name, value) {
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Some(v) => Ok(self.write.write(&mut IOValueDomainCodec, &v)?),
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None => {
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// TODO: This is apparently discouraged, and we should apparently just serialize `value`?
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let mut c = self.write.start_record(Some(1))?;
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c.boundary(&B::start(B::Item::RecordLabel))?;
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c.write_symbol(name)?;
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c.boundary(&B::mid(B::Item::RecordLabel, B::Item::RecordField))?;
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to_writer(&mut c, value)?;
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c.boundary(&B::end(B::Item::RecordField))?;
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Ok(self.write.end_record(c)?)
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}
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}
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}
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fn serialize_newtype_variant<T: ?Sized>(
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self,
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_name: &'static str,
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_variant: u32,
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variant_name: &'static str,
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value: &T,
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) -> Result<Self::Ok>
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where
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T: Serialize,
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{
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let mut c = self.write.start_record(Some(1))?;
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c.boundary(&B::start(B::Item::RecordLabel))?;
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c.write_symbol(variant_name)?;
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c.boundary(&B::mid(B::Item::RecordLabel, B::Item::RecordField))?;
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to_writer(&mut c, value)?;
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c.boundary(&B::end(B::Item::RecordField))?;
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Ok(self.write.end_record(c)?)
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}
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fn serialize_seq(self, count: Option<usize>) -> Result<Self::SerializeSeq> {
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let c = self.write.start_sequence(count)?;
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Ok(SerializeCompound::seq(self, c))
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}
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fn serialize_tuple(self, count: usize) -> Result<Self::SerializeTuple> {
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let mut c = self.write.start_record(Some(count))?;
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c.boundary(&B::start(B::Item::RecordLabel))?;
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c.write_symbol("tuple")?;
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Ok(SerializeCompound::rec(self, c))
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}
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fn serialize_tuple_struct(
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self,
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name: &'static str,
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count: usize,
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) -> Result<Self::SerializeTupleStruct> {
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let mut c = self.write.start_record(Some(count))?;
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c.boundary(&B::start(B::Item::RecordLabel))?;
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c.write_symbol(name)?;
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Ok(SerializeCompound::rec(self, c))
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}
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fn serialize_tuple_variant(
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self,
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_name: &'static str,
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_variant: u32,
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variant_name: &'static str,
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count: usize,
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) -> Result<Self::SerializeTupleVariant> {
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let mut c = self.write.start_record(Some(count))?;
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c.boundary(&B::start(B::Item::RecordLabel))?;
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c.write_symbol(variant_name)?;
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Ok(SerializeCompound::rec(self, c))
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}
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fn serialize_map(self, count: Option<usize>) -> Result<Self::SerializeMap> {
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let d = self.write.start_dictionary(count)?;
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Ok(SerializeDictionary {
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b: B::Type::default(),
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ser: self,
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d,
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})
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}
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fn serialize_struct(self, name: &'static str, count: usize) -> Result<Self::SerializeStruct> {
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let mut c = self.write.start_record(Some(count))?;
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c.boundary(&B::start(B::Item::RecordLabel))?;
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c.write_symbol(name)?;
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Ok(SerializeCompound::rec(self, c))
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}
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fn serialize_struct_variant(
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self,
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_name: &'static str,
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_variant: u32,
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variant_name: &'static str,
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count: usize,
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) -> Result<Self::SerializeStructVariant> {
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let mut c = self.write.start_record(Some(count))?;
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c.boundary(&B::start(B::Item::RecordLabel))?;
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c.write_symbol(variant_name)?;
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Ok(SerializeCompound::rec(self, c))
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}
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}
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impl<'a, 'w, W: Writer> serde::ser::SerializeMap for SerializeDictionary<'a, 'w, W> {
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type Ok = ();
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type Error = Error;
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fn serialize_key<T: ?Sized>(&mut self, key: &T) -> Result<()>
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where
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T: Serialize,
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{
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self.b.opening = Some(B::Item::DictionaryKey);
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self.d.boundary(&self.b)?;
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to_writer(&mut self.d, key)?;
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self.b.shift(None);
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Ok(())
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}
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fn serialize_value<T: ?Sized>(&mut self, value: &T) -> Result<()>
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where
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T: Serialize,
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{
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self.b.opening = Some(B::Item::DictionaryValue);
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self.d.boundary(&self.b)?;
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to_writer(&mut self.d, value)?;
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self.b.shift(None);
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Ok(())
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}
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fn end(mut self) -> Result<Self::Ok> {
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self.d.boundary(&self.b)?;
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Ok(self.ser.write.end_dictionary(self.d)?)
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}
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}
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impl<'a, 'w, W: Writer> SerializeCompound<'a, 'w, W> {
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fn seq(ser: &'a mut Serializer<'w, W>, c: W::SeqWriter) -> Self {
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SerializeCompound {
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b: B::Type::default(),
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i: B::Item::SequenceValue,
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ser,
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c: SequenceVariant::Sequence(c),
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}
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}
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fn rec(ser: &'a mut Serializer<'w, W>, c: W::RecWriter) -> Self {
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SerializeCompound {
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b: B::end(B::Item::RecordLabel),
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i: B::Item::RecordField,
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ser,
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c: SequenceVariant::Record(c),
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}
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}
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fn extend<T: ?Sized>(&mut self, value: &T) -> Result<()>
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where
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T: Serialize,
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{
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self.b.opening = Some(self.i.clone());
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match &mut self.c {
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SequenceVariant::Sequence(w) => {
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w.boundary(&self.b)?;
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to_writer(w, value)?;
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}
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SequenceVariant::Record(w) => {
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w.boundary(&self.b)?;
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to_writer(w, value)?;
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}
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}
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self.b.shift(None);
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Ok(())
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}
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fn complete(self) -> Result<()> {
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match self.c {
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SequenceVariant::Sequence(mut w) => {
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w.boundary(&self.b)?;
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Ok(self.ser.write.end_sequence(w)?)
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}
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SequenceVariant::Record(mut w) => {
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w.boundary(&self.b)?;
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Ok(self.ser.write.end_record(w)?)
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}
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}
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}
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}
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impl<'a, 'w, W: Writer> serde::ser::SerializeStruct for SerializeCompound<'a, 'w, W> {
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type Ok = ();
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type Error = Error;
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fn serialize_field<T: ?Sized>(&mut self, _name: &'static str, value: &T) -> Result<()>
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where
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T: Serialize,
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{
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self.extend(value)
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}
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fn end(self) -> Result<Self::Ok> {
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self.complete()
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}
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}
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impl<'a, 'w, W: Writer> serde::ser::SerializeStructVariant for SerializeCompound<'a, 'w, W> {
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type Ok = ();
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type Error = Error;
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fn serialize_field<T: ?Sized>(&mut self, _name: &'static str, value: &T) -> Result<()>
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where
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T: Serialize,
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{
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self.extend(value)
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}
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fn end(self) -> Result<Self::Ok> {
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self.complete()
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}
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}
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impl<'a, 'w, W: Writer> serde::ser::SerializeTuple for SerializeCompound<'a, 'w, W> {
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type Ok = ();
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type Error = Error;
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fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<()>
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where
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T: Serialize,
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{
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self.extend(value)
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}
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fn end(self) -> Result<Self::Ok> {
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self.complete()
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}
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}
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impl<'a, 'w, W: Writer> serde::ser::SerializeTupleStruct for SerializeCompound<'a, 'w, W> {
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type Ok = ();
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type Error = Error;
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fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<()>
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where
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T: Serialize,
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{
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self.extend(value)
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}
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fn end(self) -> Result<Self::Ok> {
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self.complete()
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}
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}
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impl<'a, 'w, W: Writer> serde::ser::SerializeTupleVariant for SerializeCompound<'a, 'w, W> {
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type Ok = ();
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type Error = Error;
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fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<()>
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where
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T: Serialize,
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{
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self.extend(value)
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}
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fn end(self) -> Result<Self::Ok> {
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self.complete()
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}
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}
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impl<'a, 'w, W: Writer> serde::ser::SerializeSeq for SerializeCompound<'a, 'w, W> {
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type Ok = ();
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type Error = Error;
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fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<()>
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where
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T: Serialize,
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{
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self.extend(value)
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}
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fn end(self) -> Result<Self::Ok> {
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self.complete()
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}
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}
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/// Convenience function for directly serializing a Serde-serializable `T` to the given
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/// `write`, a Preserves [writer][crate::value::writer::Writer].
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pub fn to_writer<W: Writer, T: Serialize + ?Sized>(write: &mut W, value: &T) -> Result<()> {
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Ok(value.serialize(&mut Serializer::new(write))?)
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}
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