Struct Context 

pub struct Context {
    pub history: Vec<Value>,
}

Calculation context.

Stores a history of calculated values, so that the history lookups (@) work properly. Also reifies the numeric type backing the calculations.

Fields

history: Vec<Value>

Implementations

impl Context

pub fn evaluate(&mut self, expr: &str) -> Result<Value, Error>

Evaluate an expression in this context.

This both returns the calculated value and stores a copy in the context’s history.

impl Context

pub fn evaluate_annotated(&mut self, expr: &str) -> Result<String, Error>

Evaluate an annotated expression in this context.

Annotations can include output formatting directives. Therefore, the return value is a formatted String.

This also stores a copy in the context’s history.

Trait Implementations

impl Default for Context

fn default() -> Context

Returns the “default value” for a type.