Enum EvalError 

pub enum EvalError {
    StackUnderflow,
    MissingUserConstant(usize),
    DivisionByZero,
    LogDomain,
    SqrtDomain,
    Overflow,
    Invalid,
    WithPosition {
        err: Box<EvalError>,
        pos: usize,
    },
    WithValue {
        err: Box<EvalError>,
        val: OrderedFloat<f64>,
    },
    WithExpression {
        err: Box<EvalError>,
        expr: String,
    },
}

Evaluation error types

These errors indicate what went wrong during expression evaluation. For more detailed context, use the error message methods.

Variants

StackUnderflow

Stack underflow during evaluation

MissingUserConstant(usize)

User constant slot referenced by the expression is not configured

DivisionByZero

Division by zero

LogDomain

Logarithm of non-positive number

SqrtDomain

Square root of negative number

Overflow

Overflow or NaN result

Invalid

Invalid expression

WithPosition

Error with position context

Fields

err: Box<EvalError>

pos: usize

WithValue

Error with value context

Fields

err: Box<EvalError>

val: OrderedFloat<f64>

WithExpression

Error with expression context

Fields

err: Box<EvalError>

expr: String

Implementations

impl EvalError

pub fn with_context(self, position: Option<usize>, value: Option<f64>) -> Self

Create a detailed error message with context (backward compatibility)

pub fn with_expression(self, expr: String) -> Self

Add expression context

Trait Implementations

impl Clone for EvalError

fn clone(&self) -> EvalError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EvalError

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

Formats the value using the given formatter.

impl Display for EvalError

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

Formats the value using the given formatter.

impl Error for EvalError

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 EvalError

fn eq(&self, other: &EvalError) -> 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 EvalError

impl StructuralPartialEq for EvalError