Trait SeqAccess

pub trait SeqAccess<'de>

Provides a Visitor access to each element of a sequence in the input.

This is a trait that a Deserializer passes to a Visitor implementation, which deserializes each item in a sequence.

Lifetime

The 'de lifetime of this trait is the lifetime of data that may be borrowed by deserialized sequence elements. See the page Understanding deserializer lifetimes for a more detailed explanation of these lifetimes.

Example implementation

The example data format presented on the website demonstrates an implementation of SeqAccess for a basic JSON data format.

Associated Types

type Error: Error;

The error type that can be returned if some error occurs during deserialization.

Required Methods

fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error>
where
    T: DeserializeSeed<'de>,

This returns Ok(Some(value)) for the next value in the sequence, or Ok(None) if there are no more remaining items.

Deserialize implementations should typically use SeqAccess::next_element instead.

Provided Methods

fn next_element<T>(&mut self) -> Result<Option<T>, Self::Error>
where
    T: Deserialize<'de>,

This returns Ok(Some(value)) for the next value in the sequence, or Ok(None) if there are no more remaining items.

This method exists as a convenience for Deserialize implementations. SeqAccess implementations should not override the default behavior.

fn size_hint(&self) -> Option<usize>

Returns the number of elements remaining in the sequence, if known.

Implementors