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.

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 I: Fn(&FoldContext) -> S, St: Fn(S, &L, &FoldContext) -> S, F: Fn(S, &FoldContext) -> S,