Struct Environment

pub struct Environment { /* private fields */ }

A wrapper around the stored values obtained during evaluation.

Implementations

impl Environment

pub fn new() -> Environment

Construct a new blank environment.

pub fn new_enclosed_environment(outer: &Env) -> Environment

Constructs a new enclosed environment within the outer environment.

pub fn get(&self, name: &str) -> Option<Rc<Object>>

Retrieves the value associated with a key, if it exists.

pub fn set(&mut self, name: &str, val: Rc<Object>)

Sets the value for a given key. If the key is already present in the environment, its value is updated.

Trait Implementations

impl Debug for Environment

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Environment

fn default() -> Environment

Returns the “default value” for a type.

impl PartialEq for Environment

fn eq(&self, other: &Environment) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Environment

impl StructuralPartialEq for Environment