Enum ValidationError 

#[non_exhaustive]
pub enum ValidationError {
    ColorLengthMismatch {
        expected: usize,
        actual: usize,
    },
    UnknownPiece,
    UnknownColor,
    SquareOutOfRange {
        square: usize,
        num_squares: usize,
    },
    InstanceOutOfRange {
        instance: usize,
        declared: usize,
    },
}

Reasons a Problem can fail validate.

Returned by Problem::validate and ProblemBuilder::try_build. Variants only carry the problem-relative indices needed to locate the offending item; they don’t carry P or C values so that the error type can be Eq + Hash + Clone without dragging those bounds onto the user’s piece / colour kinds.

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.

ColorLengthMismatch

square_colors is non-empty but its length doesn’t match num_squares. An empty square_colors is treated as “no colour partition declared” and is not an error — colour-keyed constraints will see zero matches.

Fields

expected: usize

num_squares.

actual: usize

square_colors.len().

UnknownPiece

A constraint references a piece kind that is not in the problem’s alphabet (pieces).

UnknownColor

A CountOnColor constraint references a colour that doesn’t appear in square_colors.

SquareOutOfRange

An At / NotAt constraint references a square index >= num_squares.

Fields

square: usize

The offending square index.

num_squares: usize

num_squares.

InstanceOutOfRange

An Order or Relative constraint references a piece instance index that exceeds the count declared for that piece via Constraint::Count { Eq, n }. Only checked when the piece has a declared Eq-count.

Fields

instance: usize

The offending instance index.

declared: usize

The declared count of that piece.

Trait Implementations

impl Clone for ValidationError

fn clone(&self) -> ValidationError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ValidationError

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ValidationError

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for ValidationError

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

Formats the value using the given formatter.

impl Error for ValidationError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl Hash for ValidationError

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 PartialEq for ValidationError

fn eq(&self, other: &ValidationError) -> 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 Serialize for ValidationError

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for ValidationError

impl Eq for ValidationError

impl StructuralPartialEq for ValidationError