3392e9c1de
This removes the direct requirement to implement `as_any` and it could be just derived. Also implement HasDisplayHandle for dyn ActiveEventLoop + '_. Suggested-by: daxpedda <daxpedda@gmail.com>
46 lines
938 B
Rust
46 lines
938 B
Rust
// A poly-fill for `lazy_cell`
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// Replace with std::sync::LazyLock when https://github.com/rust-lang/rust/issues/109736 is stabilized.
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// This isn't used on every platform, which can come up as dead code warnings.
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#![allow(dead_code)]
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use std::any::Any;
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use std::ops::Deref;
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use std::sync::OnceLock;
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pub(crate) struct Lazy<T> {
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cell: OnceLock<T>,
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init: fn() -> T,
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}
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impl<T> Lazy<T> {
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pub const fn new(f: fn() -> T) -> Self {
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Self { cell: OnceLock::new(), init: f }
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}
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}
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impl<T> Deref for Lazy<T> {
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type Target = T;
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#[inline]
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fn deref(&self) -> &'_ T {
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self.cell.get_or_init(self.init)
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}
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}
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pub trait AsAny {
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fn as_any(&self) -> &dyn Any;
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fn as_any_mut(&mut self) -> &mut dyn Any;
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}
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impl<T: Any> AsAny for T {
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#[inline(always)]
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fn as_any(&self) -> &dyn Any {
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self
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}
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#[inline(always)]
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fn as_any_mut(&mut self) -> &mut dyn Any {
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self
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}
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}
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