From 600d9ae9104b7ad3ce1c9abcdc089418720a09db Mon Sep 17 00:00:00 2001
From: Rutherther <rutherther@ditigal.xyz>
Date: Mon, 27 Oct 2025 11:36:22 +0100
Subject: [PATCH] feat: add mutation and combined perturbations

---
 codes/eoa_lib/src/perturbation/mod.rs | 54 +++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/codes/eoa_lib/src/perturbation/mod.rs b/codes/eoa_lib/src/perturbation/mod.rs
index a066faa3b91fee767513bc88f2fbcf0907309f2c..9af7eaa46141fb36c835625b9493772c454d6432 100644
--- a/codes/eoa_lib/src/perturbation/mod.rs
+++ b/codes/eoa_lib/src/perturbation/mod.rs
@@ -210,6 +210,60 @@ where
     }
 }
 
+/// Perform given perturbation only with given probability
+pub struct MutationPerturbation<T: Clone> {
+    perturbation: Box<dyn PerturbationOperator<Chromosome = T>>,
+    rng: Box<dyn RngCore>,
+    probability: f64
+}
+
+impl<T: Clone> MutationPerturbation<T> {
+    pub fn new(perturbation: Box<dyn PerturbationOperator<Chromosome = T>>, probability: f64) -> Self {
+        Self {
+            perturbation,
+            rng: Box::new(rand::rng()),
+            probability
+        }
+    }
+}
+
+impl<T: Clone> PerturbationOperator for MutationPerturbation<T> {
+    type Chromosome = T;
+
+    fn perturb(self: &mut Self, chromosome: &Self::Chromosome) -> Self::Chromosome {
+        if self.rng.random_bool(self.probability) {
+            self.perturbation.perturb(chromosome)
+        } else {
+            chromosome.clone()
+        }
+    }
+}
+
+pub struct CombinedPerturbation<T: Clone> {
+    perturbations: Vec<Box<dyn PerturbationOperator<Chromosome = T>>>,
+}
+
+impl<T: Clone> CombinedPerturbation<T> {
+    pub fn new(perturbations: Vec<Box<dyn PerturbationOperator<Chromosome = T>>>) -> Self {
+        Self {
+            perturbations,
+        }
+    }
+}
+
+impl<T: Clone> PerturbationOperator for CombinedPerturbation<T> {
+    type Chromosome = T;
+
+    fn perturb(self: &mut Self, chromosome: &Self::Chromosome) -> Self::Chromosome {
+        let mut current_chromosome = chromosome.clone();
+        for perturbation in self.perturbations.iter_mut() {
+            current_chromosome = perturbation.perturb(&current_chromosome);
+        }
+
+        current_chromosome
+    }
+}
+
 #[cfg(test)]
 pub mod tests {
     use crate::binary_string::BinaryString;