Struct ProjectionMap 

pub struct ProjectionMap { /* private fields */ }

Tracks which columns are visible after select().

Implementations

impl ProjectionMap

pub fn all() -> Self

All columns visible.

pub fn from_indices(indices: Vec<usize>) -> Self

Specific column indices visible.

pub fn resolve(&self, ncols: usize) -> Vec<usize>

Get the visible indices (or all 0..ncols if None).

pub fn len(&self, ncols: usize) -> usize

Number of visible columns.

Trait Implementations

impl Clone for ProjectionMap

fn clone(&self) -> ProjectionMap

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ProjectionMap

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

Formats the value using the given formatter.