Struct r::callable::primitive::PrimitiveIsNull

pub struct PrimitiveIsNull;

Is an object null

Checks whether an object is null

In-Language

Usage

is_null(x)

Arguments

x: Object to check.

Examples

is_null(null)
is_null(0)

Trait Implementations

impl Builtin for PrimitiveIsNull

fn kind(&self) -> SymKind

fn is_transparent(&self) -> bool

fn is_infix(&self) -> bool

impl Callable for PrimitiveIsNull

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 PrimitiveIsNull

where Self: Callable,

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

impl CallableFormals for PrimitiveIsNull

fn formals(&self) -> ExprList

impl Clone for PrimitiveIsNull

fn clone(&self) -> PrimitiveIsNull

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for PrimitiveIsNull

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

Formats the value using the given formatter.

impl PartialEq for PrimitiveIsNull

fn eq(&self, other: &PrimitiveIsNull) -> 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 PrimitiveIsNull

const SYM: &'static str = "is_null"

const KIND: &'static SymKind = _

impl StructuralPartialEq for PrimitiveIsNull