Trait TryFold 

pub trait TryFold<L, S>: Fold<L, S> {
    // Required method
    fn try_step(
        &self,
        state: S,
        entry: &L,
        context: &FoldContext,
    ) -> Result<S, FoldFailure>;
}

Fallible fold step API for reducers that can reject invalid state shapes.

Required Methods

fn try_step( &self, state: S, entry: &L, context: &FoldContext, ) -> Result<S, FoldFailure>

Process a single entry and return an error instead of panicking.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<L, S, T> TryFold<L, S> for Box<T>

where T: TryFold<L, S> + ?Sized,

fn try_step( &self, state: S, entry: &L, context: &FoldContext, ) -> Result<S, FoldFailure>

impl<L, S, T> TryFold<L, S> for Arc<T>

where T: TryFold<L, S> + ?Sized,

fn try_step( &self, state: S, entry: &L, context: &FoldContext, ) -> Result<S, FoldFailure>

Implementors

impl<L> TryFold<L, CommonFoldState> for CommonFold<L>

impl<L> TryFold<L, bool> for AnyFold<L>

impl<L> TryFold<L, i64> for SumI64Fold<L>

impl<L> TryFold<L, usize> for CountFold<L>

impl<L> TryFold<L, usize> for FilterCountFold<L>

impl<L, S, I, St, F> TryFold<L, S> for FnFold<L, S, I, St, F>

where L: Send + Sync, S: Send + Sync, I: Fn(&FoldContext) -> S + Send + Sync, St: Fn(S, &L, &FoldContext) -> S + Send + Sync, F: Fn(S, &FoldContext) -> S + Send + Sync,