From 97614941b7d98dde431104b4229630f27d9c485a Mon Sep 17 00:00:00 2001
From: Dario Izzo <dario.izzo@gmail.com>
Date: Fri, 22 Apr 2022 15:17:08 +0200
Subject: [PATCH] review 3

---
 src/problems/unconstrain.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/problems/unconstrain.cpp b/src/problems/unconstrain.cpp
index 0f7003530..4d73b847c 100644
--- a/src/problems/unconstrain.cpp
+++ b/src/problems/unconstrain.cpp
@@ -255,9 +255,9 @@ vector_double unconstrain::batch_fitness(const vector_double & xs) const
   vector_double z; // will be resized in penalize if necessary.
   for (vector_double::size_type i = 0; i < n_dvs; ++ i)
   {
-    std::copy(original_fitness.data() + i * nobj, original_fitness.data() + (i + 1) * nobj, y.begin());
+    std::copy(original_fitness.data() + i * nobj, original_fitness.data() + (i + 1) * nobj, y.data());
     penalize(y, z);
-    std::copy(z.begin(), z.begin() + nobj, retval.begin() + i * nobj);
+    std::copy(z.data(), z.data() + nobj, retval.data() + i * nobj);
   }
   return retval;
 }