From 30b408c95fa868ba0858bfd4bff1d2aecd04341e Mon Sep 17 00:00:00 2001
From: Arne Morten Kvarving <arne.morten.kvarving@sintef.no>
Date: Mon, 2 Jan 2023 08:46:32 +0100
Subject: [PATCH] NcpFlash: remove use of sstream

---
 opm/material/constraintsolvers/NcpFlash.hpp | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/opm/material/constraintsolvers/NcpFlash.hpp b/opm/material/constraintsolvers/NcpFlash.hpp
index 817274c20..a4d56fdb1 100644
--- a/opm/material/constraintsolvers/NcpFlash.hpp
+++ b/opm/material/constraintsolvers/NcpFlash.hpp
@@ -42,7 +42,6 @@
 #include <dune/common/version.hh>
 
 #include <limits>
-#include <sstream>
 
 namespace Opm {
 
@@ -233,11 +232,13 @@ public:
             }
         }
 
-        std::ostringstream oss;
-        oss << "NcpFlash solver failed:"
-            << " {c_alpha^kappa} = {" << globalMolarities << "}, "
-            << " T = " << fluidState.temperature(/*phaseIdx=*/0);
-        throw NumericalProblem(oss.str());
+        std::string msg = "NcpFlash solver failed: "
+                          "{c_alpha^kappa} = {";
+        for (const auto& v : globalMolarities)
+            msg += " " + std::to_string(getValue(v));
+        msg += " }, T = ";
+        msg += std::to_string(getValue(fluidState.temperature(/*phaseIdx=*/0)));
+        throw NumericalProblem(msg);
     }
 
     /*!