From c6e0be8ad2c69e1ae98c7545071fedd0bd9e19df Mon Sep 17 00:00:00 2001
From: Rutherther <rutherther@ditigal.xyz>
Date: Tue, 28 Oct 2025 13:36:26 +0100
Subject: [PATCH] chore: do not pass pairing as mut

---
 codes/eoa_lib/src/evolution.rs | 4 ++--
 codes/eoa_lib/src/pairing.rs   | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/codes/eoa_lib/src/evolution.rs b/codes/eoa_lib/src/evolution.rs
index 1cc6608e94c4ab35694618e87787ab7c246d9ca8..bf2e9c0fc6e4afd0b97e438725e99476b3e6b605 100644
--- a/codes/eoa_lib/src/evolution.rs
+++ b/codes/eoa_lib/src/evolution.rs
@@ -33,7 +33,7 @@ pub fn evolution_algorithm<TChromosome: Clone, TResult: Clone, const DParents: u
     parents_count: usize,
     fitness: &impl FitnessFunction<In = TChromosome, Out = TResult>,
     selection: &impl Selection<TChromosome, TResult>,
-    pairing: &mut impl Pairing<DParents, Chromosome = TChromosome, Out = TResult>,
+    pairing: &impl Pairing<DParents, Chromosome = TChromosome, Out = TResult>,
     crossover: &impl Crossover<DParents, Chromosome = TChromosome, Out = TResult>,
     perturbation: &impl PerturbationOperator<Chromosome = TChromosome>,
     replacement: &impl Replacement<TChromosome, TResult>,
@@ -125,7 +125,7 @@ pub mod tests {
             50,
             &one_max,
             &TournamentSelection::new(5, 0.8),
-            &mut AdjacentPairing::new(),
+            &AdjacentPairing::new(),
             &BinaryOnePointCrossover::new(),
             &CombinedPerturbation::new(
                 vec![
diff --git a/codes/eoa_lib/src/pairing.rs b/codes/eoa_lib/src/pairing.rs
index 45ed006e4017167885168970ed18238afc956dd7..1d18cf66c6aa07a06e80d2a92adb51ddfeb29833 100644
--- a/codes/eoa_lib/src/pairing.rs
+++ b/codes/eoa_lib/src/pairing.rs
@@ -11,7 +11,7 @@ pub trait Pairing<const D: usize> {
     type Out;
 
     fn pair<T: Iterator<Item = usize>>(
-        &mut self,
+        &self,
         population: &EvaluatedPopulation<Self::Chromosome, Self::Out>,
         parents: T
     ) -> impl Iterator<Item = ParentPairing<D>>;
@@ -36,7 +36,7 @@ impl<TChromosome, TOutput> Pairing<2> for AdjacentPairing<TChromosome, TOutput>
     type Out = TOutput;
 
     fn pair<T: Iterator<Item = usize>>(
-        &mut self,
+        &self,
         _: &EvaluatedPopulation<Self::Chromosome, Self::Out>,
         parents: T
     ) -> impl Iterator<Item = ParentPairing<2>> {