1// A poly-fill for `lazy_cell`
2// Replace with std::sync::LazyLock when https://github.com/rust-lang/rust/issues/109736 is stabilized.
3
4// This isn't used on every platform, which can come up as dead code warnings.
5#![allow(dead_code)]
6
7use std::ops::Deref;
8use std::sync::OnceLock;
9
10pub(crate) struct Lazy<T> {
11 cell: OnceLock<T>,
12 init: fn() -> T,
13}
14
15impl<T> Lazy<T> {
16 pub const fn new(f: fn() -> T) -> Self {
17 Self { cell: OnceLock::new(), init: f }
18 }
19}
20
21impl<T> Deref for Lazy<T> {
22 type Target = T;
23
24 #[inline]
25 fn deref(&self) -> &'_ T {
26 self.cell.get_or_init(self.init)
27 }
28}
29