Enum ModelError 

pub enum ModelError {
    UnknownVariable {
        item: String,
        var: VariableId,
    },
    EmptyDomain {
        var: VariableId,
    },
    DuplicateVariableId {
        var: VariableId,
    },
    InvalidConstraint {
        name: String,
        reason: String,
    },
}

A structural defect detected by ConstraintGraph::validate, independent of any concrete assignment.

Variants

UnknownVariable

A constraint or objective references a variable never registered via add_variable.

Fields

item: String

Name of the referencing constraint or objective.

var: VariableId

The unregistered variable.

EmptyDomain

A variable’s domain is empty, so it can never be assigned.

Fields

var: VariableId

The variable with an empty domain.

DuplicateVariableId

add_variable was called more than once for the same VariableId; only the last registration is retained, silently discarding the earlier one.

Fields

var: VariableId

The variable ID that was registered more than once.

InvalidConstraint

A constraint’s own parameters are self-contradictory (see Constraint::validate).

Fields

name: String

Name of the offending constraint.

reason: String

Human-readable reason, as returned by Constraint::validate.

Trait Implementations

impl Clone for ModelError

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ModelError

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

Formats the value using the given formatter.

impl Display for ModelError

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

Formats the value using the given formatter.

impl Eq for ModelError

impl Error for ModelError

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 ModelError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ModelError