From ab9a6739bf63ccb42baaa1a097b450ac0dbe1153 Mon Sep 17 00:00:00 2001
From: Rutherther <rutherther@ditigal.xyz>
Date: Sun, 30 Nov 2025 18:34:32 +0100
Subject: [PATCH] fix: implement possibility of best candidate not being found

---
 codes/eoa_lib/src/evolution.rs | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/codes/eoa_lib/src/evolution.rs b/codes/eoa_lib/src/evolution.rs
index 849e2ec578bfd0906e2161b51ca2da549a95e670..6b63c062e188fbc1caba3d96b70cabd6f3341b73 100644
--- a/codes/eoa_lib/src/evolution.rs
+++ b/codes/eoa_lib/src/evolution.rs
@@ -25,7 +25,7 @@ pub struct EvolutionStats<TInput, TResult> {
 pub struct EvolutionResult<TInput, TResult> {
     pub population: EvaluatedPopulation<TInput, TResult>,
     pub stats: EvolutionStats<TInput, TResult>,
-    pub best_candidate: EvaluatedChromosome<TInput, TResult>,
+    pub best_candidate: Option<EvaluatedChromosome<TInput, TResult>>,
     pub iterations: usize,
     pub evaluations: usize
 }
@@ -56,10 +56,12 @@ impl<TInput, TResult> EvolutionResult<TInput, TResult> {
                          })
                     .collect()
             },
-            best_candidate: EvaluatedChromosome {
-                chromosome: self.best_candidate.chromosome,
-                evaluation: map(self.best_candidate.evaluation)
-            },
+            best_candidate: self.best_candidate.map(
+                |best_candidate|
+                EvaluatedChromosome {
+                    chromosome: best_candidate.chromosome,
+                    evaluation: map(best_candidate.evaluation)
+                }),
             evaluations: self.evaluations,
             iterations: self.iterations,
         }
@@ -248,8 +250,10 @@ pub fn evolution_algorithm_best_candidate
         );
     }
 
-    let best_candidate = last_best_candidate.as_ref().unwrap().evaluated_chromosome.clone();
-    stats.best_candidates.push(last_best_candidate.unwrap());
+    let best_candidate = last_best_candidate.as_ref().map(|x| x.evaluated_chromosome.clone());
+    if last_best_candidate.is_some() {
+        stats.best_candidates.push(last_best_candidate.unwrap());
+    }
 
     Ok(EvolutionResult {
         population: current_population,