Struct EvalCtx 

pub struct EvalCtx {
    pub fuel: usize,
    pub ops: HashMap<String, Arc<CustomOp>>,
}

Per-evaluation context: fuel budget + custom operator map.

EvalCtx is Send + Sync. Build once, share via Arc<EvalCtx> across threads. Each evaluate() call receives &EvalCtx and maintains its own stack-local fuel counter — no shared mutable state.

Fields

fuel: usize

Maximum AST nodes the evaluator may visit. Default: 200.

ops: HashMap<String, Arc<CustomOp>>

Custom operator map: operator name → handler.

Implementations

impl EvalCtx

pub fn new() -> Self

Create a context with 200 fuel and no custom operators.

pub fn with_fuel(self, fuel: usize) -> Self

Override the fuel budget.

pub fn with_op<F>(self, name: &str, f: F) -> Self

where F: Fn(&[Value]) -> Result<Value, Box<dyn Error + Send + Sync>> + Send + Sync + 'static,

Register a custom operator. Operators are matched by exact name string.

Trait Implementations

impl Default for EvalCtx

fn default() -> Self

Returns the “default value” for a type.