Trait fasteval::evalns::EvalNamespace

pub trait EvalNamespace {
    fn lookup(
        &mut self, 
        name: &str, 
        args: Vec<f64>, 
        keybuf: &mut String
    ) -> Option<f64>;
}

All fasteval Namespaces must implement the EvalNamespace trait.

Required methods

fn lookup(
    &mut self,
    name: &str,
    args: Vec<f64>,
    keybuf: &mut String
) -> Option<f64>

Perform a variable/function lookup.

May return cached values.

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Implementations on Foreign Types

impl EvalNamespace for BTreeMap<String, f64>

fn lookup(
    &mut self,
    name: &str,
    args: Vec<f64>,
    keybuf: &mut String
) -> Option<f64>

impl EvalNamespace for BTreeMap<&'static str, f64>

fn lookup(
    &mut self,
    name: &str,
    args: Vec<f64>,
    keybuf: &mut String
) -> Option<f64>

impl EvalNamespace for Vec<BTreeMap<String, f64>>

fn lookup(
    &mut self,
    name: &str,
    args: Vec<f64>,
    keybuf: &mut String
) -> Option<f64>

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Implementors

impl EvalNamespace for EmptyNamespace

fn lookup(
    &mut self,
    _name: &str,
    _args: Vec<f64>,
    _keybuf: &mut String
) -> Option<f64>

Always returns None, indicating that the variable is undefined.

impl<'_> EvalNamespace for CachedCallbackNamespace<'_>

fn lookup(
    &mut self,
    name: &str,
    args: Vec<f64>,
    keybuf: &mut String
) -> Option<f64>

Returns a cached value if possible, otherwise delegates to the callback function.

impl<F> EvalNamespace for F where
    F: FnMut(&str, Vec<f64>) -> Option<f64>, 

fn lookup(
    &mut self,
    name: &str,
    args: Vec<f64>,
    _keybuf: &mut String
) -> Option<f64>

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