Struct sudoku_variants::constraint::DiagonallyAdjacentConstraint

pub struct DiagonallyAdjacentConstraint;

A RelativeCellConstraint that excludes duplicates in a diagonally adjacent cell to the reference cell. If normal Sudoku rules apply, this is equivalent to a KingsMoveConstraint.

As a visualization, the cells marked with ‘X’ in the following grid are excluded from being a 3:

┌───┬───┬───┐
│ X │   │ X │
├───┼───┼───┤
│   │ 3 │   │
├───┼───┼───┤
│ X │   │ X │
└───┴───┴───┘

Trait Implementations

impl Clone for DiagonallyAdjacentConstraint

fn clone(&self) -> DiagonallyAdjacentConstraint

Returns a copy of the value.

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

Performs copy-assignment from source.

impl RelativeCellConstraint for DiagonallyAdjacentConstraint

const RELATIVE_COORDINATES: &'static [(isize, isize)]

A slice of coordinates relative to the cell in question that must not contain the same number.

fn is_forbidden(&self, reference_cell: usize, other_cell: usize) -> bool

Given the contents of the reference cell and one other cell that is removed by one set of coordinates specified in RelativeCellConstraint::RELATIVE_COORDINATES, this method determines whether the reference cell violates the constraint. Since it is assumed that an empty cell cannot violate the constraint, this method is only called if both cells contain a number.