From c5dfb8f6efd4424a62e7073b5bee53f155e7332c Mon Sep 17 00:00:00 2001
From: Dmitri Naumov <github@naumov.de>
Date: Mon, 17 Jul 2023 22:30:17 +0200
Subject: [PATCH] [NL] Make one overload perturbIf() static

---
 NumLib/NumericalDifferentiation.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/NumLib/NumericalDifferentiation.h b/NumLib/NumericalDifferentiation.h
index dccc40f6436..1438be4ef2b 100644
--- a/NumLib/NumericalDifferentiation.h
+++ b/NumLib/NumericalDifferentiation.h
@@ -143,9 +143,9 @@ struct DefaultPerturbationStrategy
     }
 
     template <typename T>
-    T const& perturbIf(std::false_type, T const& value,
-                       double const /*plus_or_minus*/,
-                       Eigen::Index /*comp*/) const
+    static T const& perturbIf(std::false_type, T const& value,
+                              double const /*plus_or_minus*/,
+                              Eigen::Index /*comp*/)
     {
         return value;
     }
-- 
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