42 lines
800 B
Rust
42 lines
800 B
Rust
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mod green;
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mod red;
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mod syntax;
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use std::{
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sync::{Arc, Weak},
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mem
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};
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pub(crate) use self::{
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green::{GreenNode, TextLen},
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red::RedNode,
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syntax::SError,
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};
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pub use self::syntax::SyntaxNode;
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// This could be just `*const T`, but we use `Weak` for additional checks
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#[derive(Debug)]
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pub(crate) struct Ptr<T>(Weak<T>);
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impl<T> Clone for Ptr<T> {
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fn clone(&self) -> Self {
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Ptr(self.0.clone())
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}
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}
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impl<T> Ptr<T> {
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fn clone(self_: &Ptr<T>) -> Ptr<T> {
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Ptr(Weak::clone(&self_.0))
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}
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fn new(arc: &Arc<T>) -> Ptr<T> {
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Ptr(Arc::downgrade(arc))
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}
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unsafe fn get(&self) -> &T {
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let t = self.0.upgrade()
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.expect("caller must guarantee that Ptr is not null");
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let t: &T = &*t;
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mem::transmute(t)
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}
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}
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