bjoernager/rust
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MiniSet/MiniMap moved and renamed into SsoHashSet/SsoHashMap

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It is a more descriptive name and with upcoming changes
there will be nothing "mini" about them.
This commit is contained in:
Valerii Lashmanov 2020-09-23 23:32:11 -05:00
parent 6f9a8a7f9b
commit 5c224a484d
10 changed files with 45 additions and 41 deletions
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41
compiler/rustc_data_structures/src/mini_set.rs
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@ -1,41 +0,0 @@
use crate::fx::FxHashSet;
use arrayvec::ArrayVec;
use std::hash::Hash;
/// Small-storage-optimized implementation of a set.
///
/// Stores elements in a small array up to a certain length
/// and switches to `HashSet` when that length is exceeded.
pub enum MiniSet<T> {
Array(ArrayVec<[T; 8]>),
Set(FxHashSet<T>),
}
impl<T: Eq + Hash> MiniSet<T> {
/// Creates an empty `MiniSet`.
pub fn new() -> Self {
MiniSet::Array(ArrayVec::new())
}
/// Adds a value to the set.
///
/// If the set did not have this value present, true is returned.
///
/// If the set did have this value present, false is returned.
pub fn insert(&mut self, elem: T) -> bool {
match self {
MiniSet::Array(array) => {
if array.iter().any(|e| *e == elem) {
false
} else {
if let Err(error) = array.try_push(elem) {
let mut set: FxHashSet<T> = array.drain(..).collect();
set.insert(error.element());
*self = MiniSet::Set(set);
}
true
}
}
MiniSet::Set(set) => set.insert(elem),
}
}
}