[−][src]Struct evalexpr::Node

pub struct Node { /* fields omitted */ }

A node in the operator tree. The operator tree is created by the crate-level build_operator_tree method. It can be evaluated for a given configuration with the Node::eval method.

The advantage of constructing the operator tree separately from the actual evaluation is that it can be evaluated arbitrarily often with different configurations.

Examples

use evalexpr::*;

let mut configuration = HashMapConfiguration::new();
configuration.insert_variable("alpha", 2);
let node = build_operator_tree("1 + alpha").unwrap();
assert_eq!(node.eval_with_configuration(&configuration), Ok(Value::from(3)));

Methods

impl Node[src]

pub fn eval_with_configuration(
    &self,
    configuration: &dyn Configuration
) -> Result<Value, Error>[src]

Evaluates the operator tree rooted at this node with the given configuration.

Fails, if one of the operators in the expression tree fails.

pub fn eval(&self) -> Result<Value, Error>[src]

Evaluates the operator tree rooted at this node with an empty configuration.

Fails, if one of the operators in the expression tree fails.

Trait Implementations

impl Debug for Node[src]

impl Display for Node[src]

Auto Trait Implementations

impl !Send for Node

impl !Sync for Node

Blanket Implementations

impl<T, U> Into for T where
    U: From<T>, [src]

impl<T> From for T[src]

impl<T> ToString for T where
    T: Display + ?Sized, [src]

impl<T, U> TryFrom for T where
    U: Into<T>, [src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T> Borrow for T where
    T: ?Sized, [src]

impl<T> Any for T where
    T: 'static + ?Sized, [src]

impl<T> BorrowMut for T where
    T: ?Sized, [src]

impl<T, U> TryInto for T where
    U: TryFrom<T>, [src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.