pub trait Serializer: Sealed {
Show 31 methods
// Required methods
fn erased_serialize_bool(&mut self, v: bool);
fn erased_serialize_i8(&mut self, v: i8);
fn erased_serialize_i16(&mut self, v: i16);
fn erased_serialize_i32(&mut self, v: i32);
fn erased_serialize_i64(&mut self, v: i64);
fn erased_serialize_i128(&mut self, v: i128);
fn erased_serialize_u8(&mut self, v: u8);
fn erased_serialize_u16(&mut self, v: u16);
fn erased_serialize_u32(&mut self, v: u32);
fn erased_serialize_u64(&mut self, v: u64);
fn erased_serialize_u128(&mut self, v: u128);
fn erased_serialize_f32(&mut self, v: f32);
fn erased_serialize_f64(&mut self, v: f64);
fn erased_serialize_char(&mut self, v: char);
fn erased_serialize_str(&mut self, v: &str);
fn erased_serialize_bytes(&mut self, v: &[u8]);
fn erased_serialize_none(&mut self);
fn erased_serialize_some(&mut self, value: &dyn Serialize);
fn erased_serialize_unit(&mut self);
fn erased_serialize_unit_struct(&mut self, name: &'static str);
fn erased_serialize_unit_variant(
&mut self,
name: &'static str,
variant_index: u32,
variant: &'static str,
);
fn erased_serialize_newtype_struct(
&mut self,
name: &'static str,
value: &dyn Serialize,
);
fn erased_serialize_newtype_variant(
&mut self,
name: &'static str,
variant_index: u32,
variant: &'static str,
value: &dyn Serialize,
);
fn erased_serialize_seq(
&mut self,
len: Option<usize>,
) -> Result<&mut dyn SerializeSeq, ErrorImpl>;
fn erased_serialize_tuple(
&mut self,
len: usize,
) -> Result<&mut dyn SerializeTuple, ErrorImpl>;
fn erased_serialize_tuple_struct(
&mut self,
name: &'static str,
len: usize,
) -> Result<&mut dyn SerializeTupleStruct, ErrorImpl>;
fn erased_serialize_tuple_variant(
&mut self,
name: &'static str,
variant_index: u32,
variant: &'static str,
len: usize,
) -> Result<&mut dyn SerializeTupleVariant, ErrorImpl>;
fn erased_serialize_map(
&mut self,
len: Option<usize>,
) -> Result<&mut dyn SerializeMap, ErrorImpl>;
fn erased_serialize_struct(
&mut self,
name: &'static str,
len: usize,
) -> Result<&mut dyn SerializeStruct, ErrorImpl>;
fn erased_serialize_struct_variant(
&mut self,
name: &'static str,
variant_index: u32,
variant: &'static str,
len: usize,
) -> Result<&mut dyn SerializeStructVariant, ErrorImpl>;
fn erased_is_human_readable(&self) -> bool;
}Expand description
An object-safe equivalent of Serde’s Serializer trait.
Any implementation of Serde’s Serializer can be converted to a
&dyn erased_serde::Serializer or Box<dyn erased_serde::Serializer> trait
object using erased_serde::Serializer::erase.
use erased_serde::{Serialize, Serializer};
use std::collections::BTreeMap as Map;
use std::io;
fn main() {
// Construct some serializers.
let json = &mut serde_json::Serializer::new(io::stdout());
let cbor = &mut serde_cbor::Serializer::new(serde_cbor::ser::IoWrite::new(io::stdout()));
// The values in this map are boxed trait objects. Ordinarily this would not
// be possible with serde::Serializer because of object safety, but type
// erasure makes it possible with erased_serde::Serializer.
let mut formats: Map<&str, Box<dyn Serializer>> = Map::new();
formats.insert("json", Box::new(<dyn Serializer>::erase(json)));
formats.insert("cbor", Box::new(<dyn Serializer>::erase(cbor)));
// These are boxed trait objects as well. Same thing here - type erasure
// makes this possible.
let mut values: Map<&str, Box<dyn Serialize>> = Map::new();
values.insert("vec", Box::new(vec!["a", "b"]));
values.insert("int", Box::new(65536));
// Pick a Serializer out of the formats map.
let format = formats.get_mut("json").unwrap();
// Pick a Serialize out of the values map.
let value = values.get("vec").unwrap();
// This line prints `["a","b"]` to stdout.
value.erased_serialize(format).unwrap();
}This trait is sealed and can only be implemented via a serde::Serializer
impl.
Required Methods§
fn erased_serialize_bool(&mut self, v: bool)
fn erased_serialize_i8(&mut self, v: i8)
fn erased_serialize_i16(&mut self, v: i16)
fn erased_serialize_i32(&mut self, v: i32)
fn erased_serialize_i64(&mut self, v: i64)
fn erased_serialize_i128(&mut self, v: i128)
fn erased_serialize_u8(&mut self, v: u8)
fn erased_serialize_u16(&mut self, v: u16)
fn erased_serialize_u32(&mut self, v: u32)
fn erased_serialize_u64(&mut self, v: u64)
fn erased_serialize_u128(&mut self, v: u128)
fn erased_serialize_f32(&mut self, v: f32)
fn erased_serialize_f64(&mut self, v: f64)
fn erased_serialize_char(&mut self, v: char)
fn erased_serialize_str(&mut self, v: &str)
fn erased_serialize_bytes(&mut self, v: &[u8])
fn erased_serialize_none(&mut self)
fn erased_serialize_some(&mut self, value: &dyn Serialize)
fn erased_serialize_unit(&mut self)
fn erased_serialize_unit_struct(&mut self, name: &'static str)
fn erased_serialize_unit_variant( &mut self, name: &'static str, variant_index: u32, variant: &'static str, )
fn erased_serialize_newtype_struct( &mut self, name: &'static str, value: &dyn Serialize, )
fn erased_serialize_newtype_variant( &mut self, name: &'static str, variant_index: u32, variant: &'static str, value: &dyn Serialize, )
fn erased_serialize_seq( &mut self, len: Option<usize>, ) -> Result<&mut dyn SerializeSeq, ErrorImpl>
fn erased_serialize_tuple( &mut self, len: usize, ) -> Result<&mut dyn SerializeTuple, ErrorImpl>
fn erased_serialize_tuple_struct( &mut self, name: &'static str, len: usize, ) -> Result<&mut dyn SerializeTupleStruct, ErrorImpl>
fn erased_serialize_tuple_variant( &mut self, name: &'static str, variant_index: u32, variant: &'static str, len: usize, ) -> Result<&mut dyn SerializeTupleVariant, ErrorImpl>
fn erased_serialize_map( &mut self, len: Option<usize>, ) -> Result<&mut dyn SerializeMap, ErrorImpl>
fn erased_serialize_struct( &mut self, name: &'static str, len: usize, ) -> Result<&mut dyn SerializeStruct, ErrorImpl>
fn erased_serialize_struct_variant( &mut self, name: &'static str, variant_index: u32, variant: &'static str, len: usize, ) -> Result<&mut dyn SerializeStructVariant, ErrorImpl>
fn erased_is_human_readable(&self) -> bool
Implementations§
Source§impl dyn Serializer
impl dyn Serializer
Sourcepub fn erase<S>(serializer: S) -> impl Serializerwhere
S: Serializer,
pub fn erase<S>(serializer: S) -> impl Serializerwhere
S: Serializer,
Convert any Serde Serializer to a trait object.
use erased_serde::{Serialize, Serializer};
use std::collections::BTreeMap as Map;
use std::io;
fn main() {
// Construct some serializers.
let json = &mut serde_json::Serializer::new(io::stdout());
let cbor = &mut serde_cbor::Serializer::new(serde_cbor::ser::IoWrite::new(io::stdout()));
// The values in this map are boxed trait objects. Ordinarily this would not
// be possible with serde::Serializer because of object safety, but type
// erasure makes it possible with erased_serde::Serializer.
let mut formats: Map<&str, Box<dyn Serializer>> = Map::new();
formats.insert("json", Box::new(<dyn Serializer>::erase(json)));
formats.insert("cbor", Box::new(<dyn Serializer>::erase(cbor)));
// These are boxed trait objects as well. Same thing here - type erasure
// makes this possible.
let mut values: Map<&str, Box<dyn Serialize>> = Map::new();
values.insert("vec", Box::new(vec!["a", "b"]));
values.insert("int", Box::new(65536));
// Pick a Serializer out of the formats map.
let format = formats.get_mut("json").unwrap();
// Pick a Serialize out of the values map.
let value = values.get("vec").unwrap();
// This line prints `["a","b"]` to stdout.
value.erased_serialize(format).unwrap();
}