Struct EvaluationError 

pub struct EvaluationError { /* private fields */ }

The error type for evaluating of a state using a predicate.

The primary source of this error is the Predicate::evaluate_state method. This error can represent one of three following occurences:

1. A variable has a coefficient but not a value in the variable set
2. A variable has a value in the variable set that is NaN
3. A variable has a coefficient that is NaN

Values of this type can be queried for its cause, as well as the variable name causing the error.

Implementations

impl EvaluationError

pub fn missing(name: &str) -> EvaluationError

Create an error for a missing variable

This method creates a clone of the name argument.

Example

let err = EvaluationError::missing("foo");

pub fn nan_value(name: &str) -> EvaluationError

Create an error for a variable with a NaN value

This method creates a clone of the name argument.

Example

let err = EvaluationError::nan_value("foo");

pub fn nan_coefficient(name: &str) -> EvaluationError

Create an error for a variable with a NaN coefficient

This method creates a clone of the name argument.

Example

let err = EvaluationError::nan_coefficient("foo");

pub fn name(&self) -> &str

Return the name of the variable that produced the error

pub fn kind(&self) -> ErrorKind

Return the ErrorKind for this error

Trait Implementations

impl Clone for EvaluationError

fn clone(&self) -> EvaluationError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EvaluationError

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

Formats the value using the given formatter.

impl Display for EvaluationError

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

Formats the value using the given formatter.

impl Error for EvaluationError

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 EvaluationError

fn eq(&self, other: &EvaluationError) -> 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 Eq for EvaluationError

impl StructuralPartialEq for EvaluationError