Avoid direct calls of std:: namespaces

dune/elasticity/materials/mooneyrivlindensity.hh

@@ -92,7 +92,10 @@ public:
     field_type strainEnergy = 0;
 
     if (mooneyrivlin_energy == "ciarlet")
-      return mooneyrivlin_a*normFSquared + mooneyrivlin_b*normFinvSquared*detF + mooneyrivlin_c*detF*detF - ((dim-1)*mooneyrivlin_a + mooneyrivlin_b + 2*mooneyrivlin_c)*std::log(detF);
+    {
+      using std::log;
+      return mooneyrivlin_a*normFSquared + mooneyrivlin_b*normFinvSquared*detF + mooneyrivlin_c*detF*detF - ((dim-1)*mooneyrivlin_a + mooneyrivlin_b + 2*mooneyrivlin_c)*log(detF);
+    }
     else {
       strainEnergy = mooneyrivlin_10 * trCTildeMinus3 +
                         mooneyrivlin_01 * c2TildeMinus3  +
@@ -104,7 +107,8 @@ public:
                         mooneyrivlin_12 * trCTildeMinus3 * c2TildeMinus3  * c2TildeMinus3  +
                         mooneyrivlin_03 * c2TildeMinus3  * c2TildeMinus3  * c2TildeMinus3;
       if (mooneyrivlin_energy == "log") {
-        field_type logDetF = std::log(detF);
+        using std::log;
+        field_type logDetF = log(detF);
         return strainEnergy + 0.5 * mooneyrivlin_k* logDetF * logDetF;
       } else if (mooneyrivlin_energy == "square") {
         field_type detFMinus1 = detF - 1;