Struct Variables

pub struct Variables<'a> { /* private fields */ }

Environment of immutable variables

Implementations

impl<'a> Globals<'a>

pub fn new() -> Self

Creates a new, empty variable environment.

pub fn nested(context: &'a Globals<'a>) -> Self

Creates a nested variable environment, that inherits from the given context environment.

pub fn add( &mut self, name: Identifier, value: Value, ) -> Result<(), VariableError>

Adds a new variable to this environment, returning an error if the variable already exists.

pub fn get(&self, name: &Identifier) -> Option<&Value>

Returns the value of a variable, if it exists in this environment.

pub fn remove(&mut self, name: &Identifier)

Remove a variable from this enviroment, if it exists.

pub fn is_empty(&self) -> bool

pub fn iter<'b>(&'b self) -> Iter<'b>

pub fn clear(&mut self)

Clears this enviroment.