diff rust/hg-core/src/revlog/changelog.rs @ 46431:645ee7225fab

rust: Make NodePrefix allocation-free and Copy, remove NodePrefixRef

The `*Ref` struct only existed to avoid allocating `Vec`s
when cloning `NodePrefix`, but we can avoid having `Vec`
in the first place by using an inline array instead.

This makes `NodePrefix` 21 bytes (with 1 for the length)
which is smaller than before as `Vec` alone is 24 bytes.

Differential Revision: https://phab.mercurial-scm.org/D9863

--- a/rust/hg-core/src/revlog/changelog.rs	Sat Jan 30 18:30:11 2021 +0800
+++ b/rust/hg-core/src/revlog/changelog.rs	Mon Jan 25 11:48:47 2021 +0100
@@ -1,6 +1,6 @@
 use crate::repo::Repo;
 use crate::revlog::revlog::{Revlog, RevlogError};
-use crate::revlog::NodePrefixRef;
+use crate::revlog::NodePrefix;
 use crate::revlog::Revision;
 
 /// A specialized `Revlog` to work with `changelog` data format.
@@ -19,7 +19,7 @@
     /// Return the `ChangelogEntry` a given node id.
     pub fn get_node(
         &self,
-        node: NodePrefixRef,
+        node: NodePrefix,
     ) -> Result<ChangelogEntry, RevlogError> {
         let rev = self.revlog.get_node_rev(node)?;
         self.get_rev(rev)