Enum CspError 

pub enum CspError {
    VariableNotFound(usize),
    InvalidConstraint(String),
    UnsatisfiableAfterAC3,
}

Error conditions that can arise during CSP solving.

Variants

VariableNotFound(usize)

A constraint referenced a variable id that does not exist.

InvalidConstraint(String)

A constraint is structurally invalid (e.g., empty variable list).

UnsatisfiableAfterAC3

AC-3 proved the problem is unsatisfiable before backtracking began.

Trait Implementations

impl Clone for CspError

fn clone(&self) -> CspError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CspError

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

Formats the value using the given formatter.

impl Display for CspError

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

Formats the value using the given formatter.

impl Eq for CspError

impl Error for CspError

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 PartialEq for CspError

fn eq(&self, other: &CspError) -> 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 StructuralPartialEq for CspError