Struct Support 

struct Support {
    idx: Vec<u32>,
    bounds: Vec<usize>,
}

A set of voxels of the padded grid, for vectors stored on those voxels only (the voxels of the full vector outside it are zero): their indices, ascending, and for each CHUNK of the full grid where its entries start. Sums over such a vector (Self::sum) add the same terms in the same chunks as det_sum over the full vector, less the zeros, so they are equal.

Fields

idx: Vec<u32>

bounds: Vec<usize>

Implementations

impl Support

fn new(n: usize, keep: impl Fn(usize) -> bool) -> Self

The voxels of 0..n where keep

fn len(&self) -> usize

fn sum<T>(&self, f: impl Fn(usize) -> T + Sync) -> T

where T: Copy + Send + Sync + Add<Output = T> + Default,

det_sum of f over the full vector, f(j) the term of the set’s j-th voxel

fn walk(&self, c: usize, n: usize, f: impl FnMut(usize, Option<usize>))

f(l, Some(j)) for the set’s j-th voxel l and f(l, None) for the others, over the voxels of chunk c of a grid of n, in order