Struct magnus::value::Qundef

#[repr(transparent)]
pub struct Qundef(_);

A placeholder value that represents an undefined value. Not exposed to Ruby level code.

See QUNDEF to obtain a value of this type.

Implementations

impl Qundef

pub fn from_value(val: Value) -> Option<Self>

Return Some(Qundef) if val is a Qundef, None otherwise.

Examples

use magnus::{eval, value::Qundef};

// nil is not undef
assert!(Qundef::from_value(eval("nil").unwrap()).is_none());

pub unsafe fn to_value(self) -> Value

Return self as a Value.

Safety

It is not a good idea to return this to Ruby code, bad things will happen. There are only a handful of places in Ruby’s API where it is appropriate to pass a Value created from Qundef (hence this method, rather than implimenting Into<Value>).

Trait Implementations

impl Clone for Qundef

fn clone(&self) -> Qundef

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for Qundef