Struct CalcExpression 

pub struct CalcExpression { /* private fields */ }

Compiled EPICS calc expression wrapper.

Uses the full epics-base-rs calc engine which supports variables A-L (indices 0-11) plus arithmetic, math functions (ABS, SQRT, LOG, LN, EXP, SIN, COS, MIN, MAX, etc.), comparison, logical, and bitwise operators – matching the C++ EPICS calc engine.

For trigger calculations the C++ passes: A=attrValueA, B=attrValueB, C=preTrigger, D=postTrigger, E=currentImage, F=triggered

Implementations

impl CalcExpression

pub fn parse(expr: &str) -> Option<CalcExpression>

Compile an infix expression string.

Returns None if the expression is invalid.

pub fn evaluate(&self, a: f64, b: f64) -> f64

Evaluate with variables A and B only (legacy 2-variable interface). Returns the numeric result; nonzero means true for trigger purposes.

pub fn evaluate_vars(&self, vars: &[f64; 16]) -> f64

Evaluate with the full variable set (A through L and beyond).

vars is indexed 0=A, 1=B, 2=C, … 11=L, up to 15=P.

Trait Implementations

impl Clone for CalcExpression

fn clone(&self) -> CalcExpression

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CalcExpression

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

Formats the value using the given formatter.