Enum Constraint 

pub enum Constraint {
    Row {
        index: usize,
    },
    Column {
        index: usize,
    },
    LeadingDiagonal {
        index: usize,
    },
    TrailingDiagonal {
        index: usize,
    },
}

A condition which must be satisfied in order to solve an n queens puzzle.

Variants

Row

A condition that a given row should have exactly one queen.

Fields

index: usize

The row index

Column

A condition that a given column should have exactly one queen.

Fields

index: usize

The column index

LeadingDiagonal

A condition that a leading diagonal should have at most one queen.

Fields

index: usize

The leading diagonal index

TrailingDiagonal

A condition that a trailing diagonal should have at most one queen.

Fields

index: usize

The trailing diagonal index

Implementations

impl Constraint

pub fn all(side_length: usize) -> impl Iterator<Item = Constraint>

Return an iterator over all possible Constraints for a given side_length.

Trait Implementations

impl Clone for Constraint

fn clone(&self) -> Constraint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Constraint

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

Formats the value using the given formatter.

impl Hash for Constraint

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Constraint

fn cmp(&self, other: &Constraint) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Constraint

fn eq(&self, other: &Constraint) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Constraint

fn partial_cmp(&self, other: &Constraint) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for Constraint

impl Eq for Constraint

impl StructuralPartialEq for Constraint