[functions.expression] remove default arguments

dune/stuff/functions/expression.hh

@@ -247,9 +247,8 @@ public:
 
   // constructors taking a FieldMatrix for the jacobian
   template <int rows, int cols>
-  Expression(const std::string variable, const std::string expression,
-             const size_t ord = default_config().get<size_t>("order"), const std::string nm = static_id(),
-             const Dune::FieldMatrix<std::string, rows, cols> jacobian = Dune::FieldMatrix<std::string, 0, 0>())
+  Expression(const std::string variable, const std::string expression, const size_t ord, const std::string nm,
+             const Dune::FieldMatrix<std::string, rows, cols> jacobian)
     : function_(new MathExpressionFunctionType(variable, expression))
     , order_(ord)
     , name_(nm)
@@ -258,9 +257,8 @@ public:
   }
 
   template <int rows, int cols>
-  Expression(const std::string variable, const std::vector<std::string> expressions,
-             const size_t ord = default_config().get<size_t>("order"), const std::string nm = static_id(),
-             const Dune::FieldMatrix<std::string, rows, cols> jacobian = Dune::FieldMatrix<std::string, 0, 0>())
+  Expression(const std::string variable, const std::vector<std::string> expressions, const size_t ord,
+             const std::string nm, const Dune::FieldMatrix<std::string, rows, cols> jacobian)
     : function_(new MathExpressionFunctionType(variable, expressions))
     , order_(ord)
     , name_(nm)