fix bug in UniqueGenotype: neighbouring_population_size panics when genes_size < 2

basvanwesting · basvanwesting · commit 7df363c0c1a3 · 2026-02-25T18:01:41.000+01:00
diff --git a/src/genotype/unique.rs b/src/genotype/unique.rs
@@ -205,6 +205,9 @@ impl<T: Allele + Hash> HillClimbGenotype for Unique<T> {
     }
 
     fn neighbouring_population_size(&self) -> BigUint {
+        if self.genes_size < 2 {
+            return BigUint::ZERO;
+        }
         let n = BigUint::from(self.genes_size);
         let k = BigUint::from(2usize);
 

Original file line number	Diff line number	Diff line change
`@@ -205,6 +205,9 @@ impl<T: Allele + Hash> HillClimbGenotype for Unique<T> {`
`205`	`205`	`}`
`206`	`206`
`207`	`207`	`fn neighbouring_population_size(&self) -> BigUint {`
	`208`	`+ if self.genes_size < 2 {`
	`209`	`+ return BigUint::ZERO;`
	`210`	`+ }`
`208`	`211`	`let n = BigUint::from(self.genes_size);`
`209`	`212`	`let k = BigUint::from(2usize);`
`210`	`213`