forked from mirror/Riven
37 lines
830 B
Rust
37 lines
830 B
Rust
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// use std::borrow::Borrow;
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use std::collections::HashMap;
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use std::hash::Hash;
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use std::sync::Arc;
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use parking_lot::Mutex;
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pub struct InsertOnlyCHashMap<K: Hash + Eq, V> {
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base: Mutex<HashMap<K, Arc<V>>>,
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}
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impl<K: Hash + Eq, V> InsertOnlyCHashMap<K, V> {
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#[inline]
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pub fn new() -> Self {
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Self {
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base: Mutex::new(HashMap::new())
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}
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}
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// #[inline]
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// pub fn get<Q: ?Sized>(&self, key: &Q) -> Option<Arc<V>>
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// where
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// K: Borrow<Q>,
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// Q: Hash + Eq,
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// {
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// self.base.lock().get(key).map(|v| Arc::clone(v))
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// }
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#[inline]
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pub fn get_or_insert_with<F: FnOnce() -> V>(&self, key: K, default: F) -> Arc<V>
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{
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Arc::clone(self.base.lock()
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.entry(key)
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.or_insert_with(|| Arc::new(default())))
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}
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}
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