From b5a85cb1286cd809d3ec201040c54c37c03a903f Mon Sep 17 00:00:00 2001
From: Arne Morten Kvarving <arne.morten.kvarving@sintef.no>
Date: Tue, 29 Apr 2025 10:49:38 +0200
Subject: [PATCH] diffusionmodule: use std::array

---
 opm/models/common/diffusionmodule.hh | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/opm/models/common/diffusionmodule.hh b/opm/models/common/diffusionmodule.hh
index 54de1c0c4f..bf5b62c180 100644
--- a/opm/models/common/diffusionmodule.hh
+++ b/opm/models/common/diffusionmodule.hh
@@ -36,6 +36,7 @@
 #include <opm/models/common/quantitycallbacks.hh>
 #include <opm/models/discretization/common/fvbaseproperties.hh>
 
+#include <array>
 #include <stdexcept>
 
 namespace Opm {
@@ -275,8 +276,8 @@ protected:
     }
 
 private:
-    Evaluation tortuosity_[numPhases];
-    Evaluation diffusionCoefficient_[numPhases][numComponents];
+    std::array<Evaluation, numPhases> tortuosity_;
+    std::array<std::array<Evaluation, numComponents>, numPhases> diffusionCoefficient_;
 };
 
 /*!
@@ -483,8 +484,8 @@ public:
     { return effectiveDiffusionCoefficient_[phaseIdx][compIdx]; }
 
 private:
-    Evaluation moleFractionGradientNormal_[numPhases][numComponents];
-    Evaluation effectiveDiffusionCoefficient_[numPhases][numComponents];
+    std::array<std::array<Evaluation, numComponents>, numPhases> moleFractionGradientNormal_;
+    std::array<std::array<Evaluation, numComponents>, numPhases> effectiveDiffusionCoefficient_;
 };
 
 } // namespace Opm