Trait serde::ser::Serializer [−] [src]

pub trait Serializer {
    type Ok;
    type Error: Error;
    type SerializeSeq: SerializeSeq<Ok=Self::Ok, Error=Self::Error>;
    type SerializeTuple: SerializeTuple<Ok=Self::Ok, Error=Self::Error>;
    type SerializeTupleStruct: SerializeTupleStruct<Ok=Self::Ok, Error=Self::Error>;
    type SerializeTupleVariant: SerializeTupleVariant<Ok=Self::Ok, Error=Self::Error>;
    type SerializeMap: SerializeMap<Ok=Self::Ok, Error=Self::Error>;
    type SerializeStruct: SerializeStruct<Ok=Self::Ok, Error=Self::Error>;
    type SerializeStructVariant: SerializeStructVariant<Ok=Self::Ok, Error=Self::Error>;
    fn serialize_bool(self, v: bool) -> Result<Self::Ok, Self::Error>;
    fn serialize_isize(self, v: isize) -> Result<Self::Ok, Self::Error>;
    fn serialize_i8(self, v: i8) -> Result<Self::Ok, Self::Error>;
    fn serialize_i16(self, v: i16) -> Result<Self::Ok, Self::Error>;
    fn serialize_i32(self, v: i32) -> Result<Self::Ok, Self::Error>;
    fn serialize_i64(self, v: i64) -> Result<Self::Ok, Self::Error>;
    fn serialize_usize(self, v: usize) -> Result<Self::Ok, Self::Error>;
    fn serialize_u8(self, v: u8) -> Result<Self::Ok, Self::Error>;
    fn serialize_u16(self, v: u16) -> Result<Self::Ok, Self::Error>;
    fn serialize_u32(self, v: u32) -> Result<Self::Ok, Self::Error>;
    fn serialize_u64(self, v: u64) -> Result<Self::Ok, Self::Error>;
    fn serialize_f32(self, v: f32) -> Result<Self::Ok, Self::Error>;
    fn serialize_f64(self, v: f64) -> Result<Self::Ok, Self::Error>;
    fn serialize_char(self, v: char) -> Result<Self::Ok, Self::Error>;
    fn serialize_str(self, value: &str) -> Result<Self::Ok, Self::Error>;
    fn serialize_bytes(self, value: &[u8]) -> Result<Self::Ok, Self::Error>;
    fn serialize_unit(self) -> Result<Self::Ok, Self::Error>;
    fn serialize_unit_struct(self,
                             name: &'static str)
                             -> Result<Self::Ok, Self::Error>;
    fn serialize_unit_variant(self,
                              name: &'static str,
                              variant_index: usize,
                              variant: &'static str)
                              -> Result<Self::Ok, Self::Error>;
    fn serialize_newtype_struct<T: Serialize>(self,
                                              name: &'static str,
                                              value: T)
                                              -> Result<Self::Ok, Self::Error>;
    fn serialize_newtype_variant<T: Serialize>(self,
                                               name: &'static str,
                                               variant_index: usize,
                                               variant: &'static str,
                                               value: T)
                                               -> Result<Self::Ok, Self::Error>;
    fn serialize_none(self) -> Result<Self::Ok, Self::Error>;
    fn serialize_some<T: Serialize>(self,
                                    value: T)
                                    -> Result<Self::Ok, Self::Error>;
    fn serialize_seq(self,
                     len: Option<usize>)
                     -> Result<Self::SerializeSeq, Self::Error>;
    fn serialize_seq_fixed_size(self,
                                size: usize)
                                -> Result<Self::SerializeSeq, Self::Error>;
    fn serialize_tuple(self,
                       len: usize)
                       -> Result<Self::SerializeTuple, Self::Error>;
    fn serialize_tuple_struct(self,
                              name: &'static str,
                              len: usize)
                              -> Result<Self::SerializeTupleStruct, Self::Error>;
    fn serialize_tuple_variant(self,
                               name: &'static str,
                               variant_index: usize,
                               variant: &'static str,
                               len: usize)
                               -> Result<Self::SerializeTupleVariant, Self::Error>;
    fn serialize_map(self,
                     len: Option<usize>)
                     -> Result<Self::SerializeMap, Self::Error>;
    fn serialize_struct(self,
                        name: &'static str,
                        len: usize)
                        -> Result<Self::SerializeStruct, Self::Error>;
    fn serialize_struct_variant(self,
                                name: &'static str,
                                variant_index: usize,
                                variant: &'static str,
                                len: usize)
                                -> Result<Self::SerializeStructVariant, Self::Error>;
}

A trait that describes a type that can serialize a stream of values into the underlying format.

For Serialize Developers

Non-aggregate types like integers and strings can be serialized directly by calling the appropriate function. For Aggregate types there's an initial serialize_T method that yields a State object that you should not interact with. For each part of the aggregate there's a serialize_T_elt method that allows you to pass values or key/value pairs. The types of the values or the keys may change between calls, but the serialization format may not necessarily accept it. The serialize_T_elt method also takes a mutable reference to the state object. Make sure that you always use the same state object and only the state object that was returned by the serialize_T method. Finally, when your object is done, call the serialize_T_end method and pass the state object by value

For Serialization Format Developers

If your format has different situations where it accepts different types, create a Serializer for each situation. You can create the sub-Serializer in one of the aggregate serialize_T methods and return it as a state object. Remember to also set the corresponding associated type TState. In the serialize_T_elt methods you will be given a mutable reference to that state. You do not need to do any additional checks for the correctness of the state object, as it is expected that the user will not modify it. Due to the generic nature of the Serialize impls, modifying the object is impossible on stable Rust.

Associated Types

Trickery to enforce correct use of the Serialize trait. Every Serializer should set Ok = ().

The error type when some error occurs during serialization.

Type returned from serialize_seq and serialize_seq_fixed_size for serializing the content of the sequence.

Type returned from serialize_tuple for serializing the content of the tuple.

Type returned from serialize_tuple_struct for serializing the content of the tuple struct.

Type returned from serialize_tuple_variant for serializing the content of the tuple variant.

Type returned from serialize_map for serializing the content of the map.

Type returned from serialize_struct for serializing the content of the struct.

Type returned from serialize_struct_variant for serializing the content of the struct variant.

Required Methods

Serializes a bool value.

Serializes an isize value. If the format does not differentiate between isize and i64, a reasonable implementation would be to cast the value to i64 and forward to serialize_i64.

Serializes 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.

Serializes 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.

Serializes 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.

Serializes an i64 value.

Serializes a usize value. If the format does not differentiate between usize and u64, a reasonable implementation would be to cast the value to u64 and forward to serialize_u64.

Serializes 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.

Serializes 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.

Serializes 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.

Serializes au64` value.

Serializes 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.

Serializes an f64 value.

Serializes a character. If the format does not support characters, it is reasonable to serialize it as a single element str or a u32.

Serializes a &str.

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: rust let mut seq = self.serialize_seq(Some(value.len()))?; for b in value { seq.serialize_element(b)?; } seq.end()

Serializes a () value. It's reasonable to just not serialize anything.

Serializes a unit struct value. A reasonable implementation would be to forward to serialize_unit.

Serializes a unit variant, otherwise known as a variant with no arguments. A reasonable implementation would be to forward to serialize_unit.

Allows a tuple struct with a single element, also known as a newtype struct, to be more efficiently serialized than a tuple struct with multiple items. A reasonable implementation would be to forward to serialize_tuple_struct or to just serialize the inner value without wrapping.

Allows a variant with a single item to be more efficiently serialized than a variant with multiple items. A reasonable implementation would be to forward to serialize_tuple_variant.

Serializes a None value.

Serializes a Some(...) value.

Begins to serialize a sequence. This call must be followed by zero or more calls to serialize_seq_elt, then a call to serialize_seq_end.

Begins to serialize a sequence whose length will be known at deserialization time. This call must be followed by zero or more calls to serialize_seq_elt, then a call to serialize_seq_end. A reasonable implementation would be to forward to serialize_seq.

Begins to serialize a tuple. This call must be followed by zero or more calls to serialize_tuple_elt, then a call to serialize_tuple_end. A reasonable implementation would be to forward to serialize_seq.

Begins to serialize a tuple struct. This call must be followed by zero or more calls to serialize_tuple_struct_elt, then a call to serialize_tuple_struct_end. A reasonable implementation would be to forward to serialize_tuple.

Begins to serialize a tuple variant. This call must be followed by zero or more calls to serialize_tuple_variant_elt, then a call to serialize_tuple_variant_end. A reasonable implementation would be to forward to serialize_tuple_struct.

Begins to serialize a map. This call must be followed by zero or more calls to serialize_map_key and serialize_map_value, then a call to serialize_map_end.

Begins to serialize a struct. This call must be followed by zero or more calls to serialize_struct_elt, then a call to serialize_struct_end.

Begins to serialize a struct variant. This call must be followed by zero or more calls to serialize_struct_variant_elt, then a call to serialize_struct_variant_end.

Implementors