Enum Unreachable

#[non_exhaustive]
pub enum Unreachable {
    StartOutside,
    GoalOutside,
    DisconnectedComponents,
}

Why no path was produced.

A geometric fact about the input, distinguished from a numerical failure: a caller must be able to tell “there is no route” from “this could not be decided”.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

StartOutside

The start point lies outside the free-space region.

GoalOutside

The goal point lies outside the free-space region.

DisconnectedComponents

Both endpoints are inside, but no route connects them.

Trait Implementations

impl Clone for Unreachable

fn clone(&self) -> Unreachable

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Unreachable

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

Formats the value using the given formatter.

impl PartialEq for Unreachable

fn eq(&self, other: &Unreachable) -> 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 Copy for Unreachable

impl Eq for Unreachable

impl StructuralPartialEq for Unreachable