66 lines
1.4 KiB
Rust
66 lines
1.4 KiB
Rust
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//! Sanity check that alternate hashers work correctly.
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#![cfg(not(miri))] // FIXME: takes too long
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use hashbrown::HashSet;
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use std::hash::{BuildHasher, BuildHasherDefault, Hasher};
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fn check<S: BuildHasher + Default>() {
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let range = 0..1_000;
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let mut set = HashSet::<i32, S>::default();
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set.extend(range.clone());
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assert!(!set.contains(&i32::min_value()));
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assert!(!set.contains(&(range.start - 1)));
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for i in range.clone() {
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assert!(set.contains(&i));
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}
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assert!(!set.contains(&range.end));
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assert!(!set.contains(&i32::max_value()));
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}
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/// Use hashbrown's default hasher.
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#[test]
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fn default() {
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check::<hashbrown::hash_map::DefaultHashBuilder>();
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}
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/// Use std's default hasher.
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#[test]
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fn random_state() {
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check::<std::collections::hash_map::RandomState>();
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}
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/// Use a constant 0 hash.
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#[test]
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fn zero() {
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#[derive(Default)]
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struct ZeroHasher;
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impl Hasher for ZeroHasher {
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fn finish(&self) -> u64 {
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0
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}
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fn write(&mut self, _: &[u8]) {}
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}
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check::<BuildHasherDefault<ZeroHasher>>();
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}
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/// Use a constant maximum hash.
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#[test]
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fn max() {
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#[derive(Default)]
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struct MaxHasher;
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impl Hasher for MaxHasher {
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fn finish(&self) -> u64 {
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u64::max_value()
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}
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fn write(&mut self, _: &[u8]) {}
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}
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check::<BuildHasherDefault<MaxHasher>>();
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}
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