reverted example sort-axis from_indices

RPG-Alex · RPG-Alex · commit 7799efa58d41 · 2026-01-20T14:14:16.000+08:00
diff --git a/examples/sort-axis.rs b/examples/sort-axis.rs
@@ -20,10 +20,14 @@ pub struct Permutation
 impl Permutation
 {
     /// Checks if the permutation is correct
-    pub fn from_indices(v: Vec<usize>) -> Option<Self>
+    pub fn from_indices(v: Vec<usize>) -> Result<Self, ()>
     {
         let perm = Permutation { indices: v };
-        perm.correct().then_some(perm)
+        if perm.correct() {
+            Ok(perm)
+        } else {
+            Err(())
+        }
     }
 
     fn correct(&self) -> bool

Original file line number	Diff line number	Diff line change
`@@ -20,10 +20,14 @@ pub struct Permutation`
`20`	`20`	`impl Permutation`
`21`	`21`	`{`
`22`	`22`	`/// Checks if the permutation is correct`
`23`		`- pub fn from_indices(v: Vec<usize>) -> Option<Self>`
	`23`	`+ pub fn from_indices(v: Vec<usize>) -> Result<Self, ()>`
`24`	`24`	`{`
`25`	`25`	`let perm = Permutation { indices: v };`
`26`		`- perm.correct().then_some(perm)`
	`26`	`+ if perm.correct() {`
	`27`	`+ Ok(perm)`
	`28`	`+ } else {`
	`29`	`+ Err(())`
	`30`	`+ }`
`27`	`31`	`}`
`28`	`32`
`29`	`33`	`fn correct(&self) -> bool`