@@ -3,8 +3,8 @@ use core::{fmt, iter::FusedIterator, marker::PhantomData};
33use crate :: {
44 control:: Tag ,
55 raw:: {
6- Allocator , Bucket , Global , RawDrain , RawExtractIf , RawIntoIter , RawIter , RawIterHash ,
7- RawTable ,
6+ Allocator , Bucket , FullBucketsIndices , Global , RawDrain , RawExtractIf , RawIntoIter ,
7+ RawIter , RawIterHash , RawIterHashIndices , RawTable ,
88 } ,
99 TryReserveError ,
1010} ;
@@ -1000,7 +1000,7 @@ where
10001000/// let mut table = HashTable::new();
10011001/// let hasher = DefaultHashBuilder::default();
10021002/// let hasher = |val: &_| hasher.hash_one(val);
1003- /// table.insert_unique(hasher(&"a"), "b ", hasher);
1003+ /// table.insert_unique(hasher(&"a"), "a ", hasher);
10041004/// table.insert_unique(hasher(&"b"), "b", hasher);
10051005///
10061006/// // Will print in an arbitrary order.
@@ -1071,6 +1071,42 @@ where
10711071 }
10721072 }
10731073
1074+ /// An iterator producing the `usize` indices of all occupied buckets.
1075+ ///
1076+ /// The order in which the iterator yields indices is unspecified
1077+ /// and may change in the future.
1078+ ///
1079+ /// # Examples
1080+ ///
1081+ /// ```
1082+ /// # #[cfg(feature = "nightly")]
1083+ /// # fn test() {
1084+ /// use hashbrown::{HashTable, DefaultHashBuilder};
1085+ /// use std::hash::BuildHasher;
1086+ ///
1087+ /// let mut table = HashTable::new();
1088+ /// let hasher = DefaultHashBuilder::default();
1089+ /// let hasher = |val: &_| hasher.hash_one(val);
1090+ /// table.insert_unique(hasher(&"a"), "a", hasher);
1091+ /// table.insert_unique(hasher(&"b"), "b", hasher);
1092+ ///
1093+ /// // Will print in an arbitrary order.
1094+ /// for index in table.iter_buckets() {
1095+ /// println!("{index}: {}", table.get_bucket(index).unwrap());
1096+ /// }
1097+ /// # }
1098+ /// # fn main() {
1099+ /// # #[cfg(feature = "nightly")]
1100+ /// # test()
1101+ /// # }
1102+ /// ```
1103+ pub fn iter_buckets ( & self ) -> IterBuckets < ' _ > {
1104+ IterBuckets {
1105+ inner : unsafe { self . raw . full_buckets_indices ( ) } ,
1106+ marker : PhantomData ,
1107+ }
1108+ }
1109+
10741110 /// An iterator visiting all elements which may match a hash.
10751111/// The iterator element type is `&'a T`.
10761112///
@@ -1163,6 +1199,47 @@ where
11631199 }
11641200 }
11651201
1202+ /// An iterator producing the `usize` indices of all buckets which may match a hash.
1203+ ///
1204+ /// This iterator may return indices from the table that have a hash value
1205+ /// different than the one provided. You should always validate the returned
1206+ /// values before using them.
1207+ ///
1208+ /// The order in which the iterator yields indices is unspecified
1209+ /// and may change in the future.
1210+ ///
1211+ /// # Examples
1212+ ///
1213+ /// ```
1214+ /// # #[cfg(feature = "nightly")]
1215+ /// # fn test() {
1216+ /// use hashbrown::{HashTable, DefaultHashBuilder};
1217+ /// use std::hash::BuildHasher;
1218+ ///
1219+ /// let mut table = HashTable::new();
1220+ /// let hasher = DefaultHashBuilder::default();
1221+ /// let hasher = |val: &_| hasher.hash_one(val);
1222+ /// table.insert_unique(hasher(&"a"), "a", hasher);
1223+ /// table.insert_unique(hasher(&"a"), "b", hasher);
1224+ /// table.insert_unique(hasher(&"b"), "c", hasher);
1225+ ///
1226+ /// // Will print the indices with "a" and "b" (and possibly "c") in an arbitrary order.
1227+ /// for index in table.iter_hash_buckets(hasher(&"a")) {
1228+ /// println!("{index}: {}", table.get_bucket(index).unwrap());
1229+ /// }
1230+ /// # }
1231+ /// # fn main() {
1232+ /// # #[cfg(feature = "nightly")]
1233+ /// # test()
1234+ /// # }
1235+ /// ```
1236+ pub fn iter_hash_buckets ( & self , hash : u64 ) -> IterHashBuckets < ' _ > {
1237+ IterHashBuckets {
1238+ inner : unsafe { self . raw . iter_hash_buckets ( hash) } ,
1239+ marker : PhantomData ,
1240+ }
1241+ }
1242+
11661243 /// Retains only the elements specified by the predicate.
11671244///
11681245/// In other words, remove all elements `e` such that `f(&e)` returns `false`.
@@ -2484,6 +2561,46 @@ where
24842561 }
24852562}
24862563
2564+ /// An iterator producing the `usize` indices of all occupied buckets,
2565+ /// within the range `0..table.num_buckets()`.
2566+ ///
2567+ /// The order in which the iterator yields indices is unspecified
2568+ /// and may change in the future.
2569+ ///
2570+ /// This `struct` is created by the [`HashTable::iter_buckets`] method. See its
2571+ /// documentation for more.
2572+ #[ derive( Clone , Default ) ]
2573+ pub struct IterBuckets < ' a > {
2574+ inner : FullBucketsIndices ,
2575+ marker : PhantomData < & ' a ( ) > ,
2576+ }
2577+
2578+ impl Iterator for IterBuckets < ' _ > {
2579+ type Item = usize ;
2580+
2581+ fn next ( & mut self ) -> Option < usize > {
2582+ self . inner . next ( )
2583+ }
2584+
2585+ fn size_hint ( & self ) -> ( usize , Option < usize > ) {
2586+ self . inner . size_hint ( )
2587+ }
2588+ }
2589+
2590+ impl ExactSizeIterator for IterBuckets < ' _ > {
2591+ fn len ( & self ) -> usize {
2592+ self . inner . len ( )
2593+ }
2594+ }
2595+
2596+ impl FusedIterator for IterBuckets < ' _ > { }
2597+
2598+ impl fmt:: Debug for IterBuckets < ' _ > {
2599+ fn fmt ( & self , f : & mut fmt:: Formatter < ' _ > ) -> fmt:: Result {
2600+ f. debug_list ( ) . entries ( self . clone ( ) ) . finish ( )
2601+ }
2602+ }
2603+
24872604/// An iterator over the entries of a `HashTable` that could match a given hash.
24882605/// The iterator element type is `&'a T`.
24892606///
@@ -2610,6 +2727,32 @@ where
26102727 }
26112728}
26122729
2730+ /// An iterator producing the `usize` indices of all buckets which may match a hash.
2731+ ///
2732+ /// This `struct` is created by the [`HashTable::iter_hash_buckets`] method. See its
2733+ /// documentation for more.
2734+ #[ derive( Clone , Default ) ]
2735+ pub struct IterHashBuckets < ' a > {
2736+ inner : RawIterHashIndices ,
2737+ marker : PhantomData < & ' a ( ) > ,
2738+ }
2739+
2740+ impl Iterator for IterHashBuckets < ' _ > {
2741+ type Item = usize ;
2742+
2743+ fn next ( & mut self ) -> Option < Self :: Item > {
2744+ self . inner . next ( )
2745+ }
2746+ }
2747+
2748+ impl FusedIterator for IterHashBuckets < ' _ > { }
2749+
2750+ impl fmt:: Debug for IterHashBuckets < ' _ > {
2751+ fn fmt ( & self , f : & mut fmt:: Formatter < ' _ > ) -> fmt:: Result {
2752+ f. debug_list ( ) . entries ( self . clone ( ) ) . finish ( )
2753+ }
2754+ }
2755+
26132756/// An owning iterator over the entries of a `HashTable` in arbitrary order.
26142757/// The iterator element type is `T`.
26152758///
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