Struct Ranges 

pub struct Ranges<'a> {
    pub starts: &'a [usize],
    pub lens: &'a [usize],
}

One range of positions for each group, in any order, as each one’s start and length: a segmented array’s vector items as their entries in its leaf. Each range folds by Reduction::slice and scans by Reduction::scan. An empty range folds to R::unit().

Fields

starts: &'a [usize]

Where each range starts.

lens: &'a [usize]

How many positions each range holds.

Trait Implementations

impl<'a> Clone for Ranges<'a>

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Copy for Ranges<'a>

impl<'a> Debug for Ranges<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Grouping for Ranges<'_>

fn len(&self) -> usize

The number of groups.

fn fold<T: Copy, R: Reduction<T>>(&self, data: &[T]) -> (Vec<R::Total>, bool)

Folds each group of data by R, and whether every fold fits.

fn scan<T: Copy, R: Reduction<T>>(&self, data: &[T]) -> (Vec<R::Total>, bool)

Scans each group of data by R: every item’s running total within its group, the groups one after another in group order, each in its items’ order, and whether every total fits.