From 25ecfd8182a3eeab77e2f10d4765c4b46cf72259 Mon Sep 17 00:00:00 2001
From: RiccardoFrenner <76073356+RiccardoFrenner@users.noreply.github.com>
Date: Tue, 16 Jul 2024 11:06:07 +0200
Subject: [PATCH] Rewrite ParticleForce operator+ to improve performance.

---
 src/core/Particle.hpp | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/src/core/Particle.hpp b/src/core/Particle.hpp
index 8e81bfe200..2e125ae3ab 100644
--- a/src/core/Particle.hpp
+++ b/src/core/Particle.hpp
@@ -299,15 +299,17 @@ struct ParticleForce {
 
   friend ParticleForce operator+(ParticleForce const &lhs,
                                  ParticleForce const &rhs) {
-#ifdef ROTATION
-    return {lhs.f + rhs.f, lhs.torque + rhs.torque};
-#else
-    return lhs.f + rhs.f;
-#endif
+    ParticleForce result = lhs;
+    result += rhs;
+    return result;
   }
 
   ParticleForce &operator+=(ParticleForce const &rhs) {
-    return *this = *this + rhs;
+    f += rhs.f;
+#ifdef ROTATION
+    torque += rhs.torque;
+#endif
+    return *this;
   }
 
   /** force. */