moved to new module dune-solvers

[[Imported from SVN: r2348]]

dune-solvers/solvers/solver.hh

+#ifndef DUNE_SOLVER_HH
+#define DUNE_SOLVER_HH
+
+#include "numproc.hh"
+
+    /** \brief The base class for all sorts of solver algorithms */
+    class Solver : public NumProc
+    {
+    public:
+        Solver(VerbosityMode verbosity)
+            : NumProc(verbosity)
+        {}
+
+        /** \brief Virtual destructor */
+        virtual ~Solver() {}
+
+        /** \brief Do the necessary preprocessing */
+        virtual void preprocess();
+
+        /** \brief Derived classes overload this with the actual
+         * solution algorithm */
+        virtual void solve() = 0;
+
+    };
+
+void Solver::preprocess()
+{
+    // Default: Do nothing
+}
+
+#endif