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This commit is contained in:
Nicholas Nethercote 2022-05-13 10:07:45 +10:00
parent 2469ed0142
commit a61a85eb24
1 changed files with 3 additions and 0 deletions
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3
library/proc_macro/src/bridge/handle.rs
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@ -8,6 +8,8 @@ use std::sync::atomic::{AtomicUsize, Ordering};
pub(super) type Handle = NonZeroU32; pub(super) type Handle = NonZeroU32;
/// A store that associates values of type `T` with numeric handles. A value can
/// be looked up using its handle.
pub(super) struct OwnedStore<T: 'static> { pub(super) struct OwnedStore<T: 'static> {
counter: &'static AtomicUsize, counter: &'static AtomicUsize,
data: BTreeMap<Handle, T>, data: BTreeMap<Handle, T>,
@ -49,6 +51,7 @@ impl<T> IndexMut<Handle> for OwnedStore<T> {
} }
} }
/// Like `OwnedStore`, but avoids storing any value more than once.
pub(super) struct InternedStore<T: 'static> { pub(super) struct InternedStore<T: 'static> {
owned: OwnedStore<T>, owned: OwnedStore<T>,
interner: HashMap<T, Handle>, interner: HashMap<T, Handle>,