Struct r::callable::primitive::PrimitiveEnvironment

pub struct PrimitiveEnvironment;

Get an Environment

Fetches an object’s environment.

In-Language

Usage

environment(fun)

Arguments

fun: An object for which to fetch a relevant environment. When missing, return the current execution environment. Although fun may imply that this only operates on functions, environments can be fetched from other objects with meaningful associated environments such as environments (returning their parent), or promises (returning their expression’s originating environment).

Examples

environment()

environment(parent())

Trait Implementations

impl Builtin for PrimitiveEnvironment

fn kind(&self) -> SymKind

fn is_transparent(&self) -> bool

fn is_infix(&self) -> bool

impl Callable for PrimitiveEnvironment

fn call(&self, args: ExprList, stack: &mut CallStack) -> EvalResult

fn match_args( &self, args: List, stack: &mut CallStack, ) -> Result<(List, List), Signal>

fn match_arg_exprs( &self, args: ExprList, stack: &mut CallStack, ) -> Result<(List, List), Signal>

fn call_mut(&self, args: ExprList, stack: &mut CallStack) -> EvalResult

fn call_matched( &self, _args: List, _ellipsis: List, _stack: &mut CallStack, ) -> EvalResult

fn call_assign( &self, value: Expr, args: ExprList, stack: &mut CallStack, ) -> EvalResult

impl CallableClone for PrimitiveEnvironment

where Self: Callable,

fn callable_clone(&self) -> Box<dyn Builtin>

impl CallableFormals for PrimitiveEnvironment

fn formals(&self) -> ExprList

impl Clone for PrimitiveEnvironment

fn clone(&self) -> PrimitiveEnvironment

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PrimitiveEnvironment

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

Formats the value using the given formatter.

impl PartialEq for PrimitiveEnvironment

fn eq(&self, other: &PrimitiveEnvironment) -> 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 Sym for PrimitiveEnvironment

const SYM: &'static str = "environment"

const KIND: &'static SymKind = _

impl StructuralPartialEq for PrimitiveEnvironment