Struct Expr 

pub struct Expr { /* private fields */ }

A tiny safe expression evaluator for fitness functions.

Grammar: numbers, x[0], x[i], + - * / ^ ( ), unary minus, sin cos tan exp log sqrt abs, constants pi, e.

No eval, no I/O, no recursion depth risk (operand stack bounded by expression length) — safe to run on untrusted tool input.

Implementations

impl Expr

pub fn parse(src: &str) -> Result<Self, String>

Parse an expression string.

pub fn evaluate(&self, x: &[f64]) -> Result<f64, String>

Evaluate the expression at point x.

Trait Implementations

impl Clone for Expr

fn clone(&self) -> Expr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Expr

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

Formats the value using the given formatter.