Struct LazySeq 

pub struct LazySeq {
    pub state: Mutex<LazySeqState>,
}

A lazy sequence that forces its thunk exactly once and caches the result.

Fields

state: Mutex<LazySeqState>

Implementations

impl LazySeq

pub fn new(thunk: Box<dyn Thunk>) -> Self

pub fn realize(&self) -> Value

Realize the sequence: force the thunk on first call, return cached value on subsequent calls. On error, returns Value::Nil and caches the error (retrievable via error()).

pub fn error(&self) -> Option<String>

Return the cached error message, if the thunk failed.

Trait Implementations

impl Debug for LazySeq

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

Formats the value using the given formatter.

impl Trace for LazySeq

fn trace(&self, visitor: &mut MarkVisitor)

fn gc_size_extra(&self) -> usize