Struct StructFieldTracker 

pub struct StructFieldTracker<'a> { /* private fields */ }

Tracks which fields have been seen while deserializing a struct.

This is the first building block of the shared visitor requested in issue #1127 – it centralizes duplicate detection, unknown-field tracking, and default synthesis hooks so individual format crates don’t have to reimplement the bookkeeping.

Implementations

impl<'a> StructFieldTracker<'a>

pub fn new(resolution: &'a Resolution) -> Self

Create a tracker for the given resolution.

pub fn record(&mut self, name: &str) -> FieldMatch<'a>

Record an incoming serialized field and classify it.

pub fn missing_required(&self) -> Vec<&'static str>

Return serialized names for required fields that have not been seen yet.

pub fn missing_optional(&self) -> impl Iterator<Item = &'a FieldInfo>

Iterate over optional fields that are still unset (useful for defaults).