Struct SequentialFold 

pub struct SequentialFold<L, S1, S2, F1, F2, M>
where
    F1: Fold<L, S1>,
    F2: Fold<L, S2>,
    M: Fn(&S1, &FoldContext) -> FoldContext,
{ /* private fields */ }

Sequential fold — run one fold, then use its output to inform another.

Type Compatibility Invariant

Both F1 and F2 must accept the same entry type L. The state types S1 and S2 are independent. The context_mapper is the only bridge between the two folds.

Implementations

impl<L, S1, S2, F1, F2, M> SequentialFold<L, S1, S2, F1, F2, M>

where F1: Fold<L, S1>, F2: Fold<L, S2>, M: Fn(&S1, &FoldContext) -> FoldContext,

pub fn new(first: F1, second: F2, context_mapper: M) -> Self

Create a sequential fold.

pub fn execute<'a, I>( &self, entries: I, context: &FoldContext, ) -> (FoldOutcome<S1>, FoldOutcome<S2>)

where I: IntoIterator<Item = &'a L> + Clone, L: 'a,

Execute the sequential fold.