[][src]Struct serde::ser::Impossible

pub struct Impossible<Ok, Error> { /* fields omitted */ }

Helper type for implementing a Serializer that does not support serializing one of the compound types.

This type cannot be instantiated, but implements every one of the traits corresponding to the Serializer compound types: SerializeSeq, SerializeTuple, SerializeTupleStruct, SerializeTupleVariant, SerializeMap, SerializeStruct, and SerializeStructVariant.

This code runs with edition 2018
impl Serializer for MySerializer {
    type Ok = ();
    type Error = Error;

    type SerializeSeq = Impossible<(), Error>;
    /* other associated types */

    /// This data format does not support serializing sequences.
    fn serialize_seq(self,
                     len: Option<usize>)
                     -> Result<Self::SerializeSeq, Error> {
        // Given Impossible cannot be instantiated, the only
        // thing we can do here is to return an error.
        Err(...)
    }

    /* other Serializer methods */
}

Trait Implementations

impl<Ok, Error> SerializeSeq for Impossible<Ok, Error> where
    Error: Error
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type Ok = Ok

Must match the Ok type of our Serializer.

type Error = Error

Must match the Error type of our Serializer.

impl<Ok, Error> SerializeTuple for Impossible<Ok, Error> where
    Error: Error
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type Ok = Ok

Must match the Ok type of our Serializer.

type Error = Error

Must match the Error type of our Serializer.

impl<Ok, Error> SerializeTupleStruct for Impossible<Ok, Error> where
    Error: Error
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type Ok = Ok

Must match the Ok type of our Serializer.

type Error = Error

Must match the Error type of our Serializer.

impl<Ok, Error> SerializeTupleVariant for Impossible<Ok, Error> where
    Error: Error
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type Ok = Ok

Must match the Ok type of our Serializer.

type Error = Error

Must match the Error type of our Serializer.

impl<Ok, Error> SerializeMap for Impossible<Ok, Error> where
    Error: Error
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type Ok = Ok

Must match the Ok type of our Serializer.

type Error = Error

Must match the Error type of our Serializer.

fn serialize_entry<K: ?Sized, V: ?Sized>(
    &mut self,
    key: &K,
    value: &V
) -> Result<(), Self::Error> where
    K: Serialize,
    V: Serialize
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Serialize a map entry consisting of a key and a value. Read more

impl<Ok, Error> SerializeStruct for Impossible<Ok, Error> where
    Error: Error
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type Ok = Ok

Must match the Ok type of our Serializer.

type Error = Error

Must match the Error type of our Serializer.

fn skip_field(&mut self, key: &'static str) -> Result<(), Self::Error>[src]

Indicate that a struct field has been skipped.

impl<Ok, Error> SerializeStructVariant for Impossible<Ok, Error> where
    Error: Error
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type Ok = Ok

Must match the Ok type of our Serializer.

type Error = Error

Must match the Error type of our Serializer.

fn skip_field(&mut self, key: &'static str) -> Result<(), Self::Error>[src]

Indicate that a struct variant field has been skipped.

Auto Trait Implementations

impl<Ok, Error> Send for Impossible<Ok, Error> where
    Error: Send,
    Ok: Send

impl<Ok, Error> Unpin for Impossible<Ok, Error> where
    Error: Unpin,
    Ok: Unpin

impl<Ok, Error> Sync for Impossible<Ok, Error> where
    Error: Sync,
    Ok: Sync

impl<Ok, Error> UnwindSafe for Impossible<Ok, Error> where
    Error: UnwindSafe,
    Ok: UnwindSafe

impl<Ok, Error> RefUnwindSafe for Impossible<Ok, Error> where
    Error: RefUnwindSafe,
    Ok: RefUnwindSafe

Blanket Implementations

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
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impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
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type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

impl<T> Borrow<T> for T where
    T: ?Sized
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impl<T> BorrowMut<T> for T where
    T: ?Sized
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impl<T> Any for T where
    T: 'static + ?Sized
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