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diff rust/hg-core/examples/nodemap/index.rs @ 50976:4c5f6e95df84

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rust: make `Revision` a newtype This change is the one we've been building towards during this series. The aim is to make `Revision` mean more than a simple integer, holding the information that it is valid for a given revlog index. While this still allows for programmer error, since creating a revision directly and querying a different index with a "checked" revision are still possible, the friction created by the newtype will hopefully make us think twice about which type to use. Enough of the Rust ecosystem relies on the newtype pattern to be efficiently optimized away (even compiler in codegen tests?), so I'm not worried about this being a fundamental problem. [1] https://github.com/rust-lang/rust/blob/7a70647f195f6b0a0f1ebd72b1542ba91a32f43a/tests/codegen/vec-in-place.rs#L47
author Rapha?l Gom?s <rgomes@octobus.net>
date Fri, 18 Aug 2023 14:34:29 +0200
parents e834b79def74
children bd8081e9fd62
line wrap: on
line diff
--- a/rust/hg-core/examples/nodemap/index.rs	Thu Aug 10 11:01:07 2023 +0200
+++ b/rust/hg-core/examples/nodemap/index.rs	Fri Aug 18 14:34:29 2023 +0200
@@ -29,7 +29,7 @@
 
 impl IndexEntry {
     fn parents(&self) -> [Revision; 2] {
-        [Revision::from_be(self.p1), Revision::from_be(self.p1)]
+        [self.p1, self.p2]
     }
 }
 
@@ -42,23 +42,18 @@
         if rev == NULL_REVISION {
             return None;
         }
-        let i = rev as usize;
-        if i >= self.len() {
-            None
-        } else {
-            Some(&self.data[i].node)
-        }
+        Some(&self.data[rev.0 as usize].node)
     }
 }
 
 impl Graph for &Index {
     fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError> {
-        let [p1, p2] = (*self).data[rev as usize].parents();
+        let [p1, p2] = self.data[rev.0 as usize].parents();
         let len = (*self).len();
         if p1 < NULL_REVISION
             || p2 < NULL_REVISION
-            || p1 as usize >= len
-            || p2 as usize >= len
+            || p1.0 as usize >= len
+            || p2.0 as usize >= len
         {
             return Err(GraphError::ParentOutOfRange(rev));
         }