Trait fasteval::evaler::Evaler

pub trait Evaler: Debug {
    fn eval(
        &self, 
        slab: &Slab, 
        ns: &mut impl EvalNamespace
    ) -> Result<f64, Error>;
    fn _var_names(&self, slab: &Slab, dst: &mut BTreeSet<String>);

    fn var_names(&self, slab: &Slab) -> BTreeSet<String> { ... }
}

You must use this trait so you can call .eval().

Required methods

fn eval(&self, slab: &Slab, ns: &mut impl EvalNamespace) -> Result<f64, Error>

Evaluate this Expression/Instruction and return an f64.

Returns a fasteval::Error if there are any problems, such as undefined variables.

fn _var_names(&self, slab: &Slab, dst: &mut BTreeSet<String>)

Don't call this directly. Use var_names() instead.

This exists because of ternary short-circuits; they prevent us from getting a complete list of vars just by doing eval() with a clever callback.

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Provided methods

fn var_names(&self, slab: &Slab) -> BTreeSet<String>

Returns a list of variables and custom functions that are used by this Expression/Instruction.

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Implementors

impl Evaler for Instruction

fn _var_names(&self, slab: &Slab, dst: &mut BTreeSet<String>)

fn eval(&self, slab: &Slab, ns: &mut impl EvalNamespace) -> Result<f64, Error>

impl Evaler for StdFunc

fn _var_names(&self, slab: &Slab, dst: &mut BTreeSet<String>)

fn eval(&self, slab: &Slab, ns: &mut impl EvalNamespace) -> Result<f64, Error>

impl Evaler for UnaryOp

fn _var_names(&self, slab: &Slab, dst: &mut BTreeSet<String>)

fn eval(&self, slab: &Slab, ns: &mut impl EvalNamespace) -> Result<f64, Error>

impl Evaler for Value

fn _var_names(&self, slab: &Slab, dst: &mut BTreeSet<String>)

fn eval(&self, slab: &Slab, ns: &mut impl EvalNamespace) -> Result<f64, Error>

impl Evaler for Expression

fn _var_names(&self, slab: &Slab, dst: &mut BTreeSet<String>)

fn eval(&self, slab: &Slab, ns: &mut impl EvalNamespace) -> Result<f64, Error>

impl Evaler for PrintFunc

fn _var_names(&self, slab: &Slab, dst: &mut BTreeSet<String>)

fn eval(&self, slab: &Slab, ns: &mut impl EvalNamespace) -> Result<f64, Error>

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