diff options
Diffstat (limited to '')
| -rw-r--r-- | vendor/itertools/src/unique_impl.rs | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/vendor/itertools/src/unique_impl.rs b/vendor/itertools/src/unique_impl.rs index 2240f36ed..4e81e78ec 100644 --- a/vendor/itertools/src/unique_impl.rs +++ b/vendor/itertools/src/unique_impl.rs @@ -1,6 +1,5 @@ - use std::collections::HashMap; -use std::collections::hash_map::{Entry}; +use std::collections::hash_map::Entry; use std::hash::Hash; use std::fmt; use std::iter::FusedIterator; @@ -12,7 +11,9 @@ use std::iter::FusedIterator; #[must_use = "iterator adaptors are lazy and do nothing unless consumed"] pub struct UniqueBy<I: Iterator, V, F> { iter: I, - // Use a hashmap for the entry API + // Use a Hashmap for the Entry API in order to prevent hashing twice. + // This can maybe be replaced with a HashSet once `get_or_insert_with` + // or a proper Entry API for Hashset is stable and meets this msrv used: HashMap<V, ()>, f: F, } |