allocative/impls/std/
cell.rsuse std::cell::OnceCell;
use std::cell::RefCell;
use std::sync::OnceLock;
use crate::impls::common::DATA_NAME;
use crate::Allocative;
use crate::Visitor;
impl<T: Allocative> Allocative for RefCell<T> {
fn visit<'a, 'b: 'a>(&self, visitor: &'a mut Visitor<'b>) {
let mut visitor = visitor.enter_self_sized::<Self>();
if let Ok(v) = self.try_borrow() {
visitor.visit_field(DATA_NAME, &*v);
}
visitor.exit();
}
}
impl<T: Allocative> Allocative for OnceCell<T> {
fn visit<'a, 'b: 'a>(&self, visitor: &'a mut Visitor<'b>) {
let mut visitor = visitor.enter_self_sized::<Self>();
if let Some(v) = self.get() {
visitor.visit_field::<T>(DATA_NAME, v);
}
visitor.exit();
}
}
impl<T: Allocative> Allocative for OnceLock<T> {
fn visit<'a, 'b: 'a>(&self, visitor: &'a mut Visitor<'b>) {
let mut visitor = visitor.enter_self_sized::<Self>();
if let Some(v) = self.get() {
visitor.visit_field::<T>(DATA_NAME, v);
}
visitor.exit();
}
}
#[cfg(test)]
mod tests {
use std::cell::OnceCell;
use std::cell::RefCell;
use crate::golden::golden_test;
#[test]
fn test_default() {
golden_test!(&RefCell::new("abc".to_owned()))
}
#[test]
fn test_borrowed() {
let cell = RefCell::new("abc".to_owned());
let _lock = cell.borrow_mut();
golden_test!(&cell)
}
#[test]
fn test_once_cell() {
let cell = OnceCell::new();
cell.set("abc".to_owned()).unwrap();
golden_test!(&cell)
}
}