Hadrons: moving Hadrons to root directory, build system improvements

Hadrons/Solver.hpp

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+/*************************************************************************************
+
+Grid physics library, www.github.com/paboyle/Grid 
+
+Source file: extras/Hadrons/Solver.hpp
+
+Copyright (C) 2015-2018
+
+Author: Antonin Portelli <antonin.portelli@me.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+See the full license in the file "LICENSE" in the top level distribution directory
+*************************************************************************************/
+/*  END LEGAL */
+#ifndef Hadrons_Solver_hpp_
+#define Hadrons_Solver_hpp_
+
+#include <Hadrons/Global.hpp>
+
+BEGIN_HADRONS_NAMESPACE
+
+template <typename FImpl>
+class Solver
+{
+public:
+    typedef typename FImpl::FermionField                      FermionField;
+    typedef FermionOperator<FImpl>                            FMat; 
+    typedef std::function<void(FermionField &, 
+                               const FermionField &)>         SolverFn;
+public:
+    Solver(SolverFn fn, FMat &mat): mat_(mat), fn_(fn) {}
+
+    void operator()(FermionField &sol, const FermionField &src)
+    {
+        fn_(sol, src);
+    }
+
+    FMat & getFMat(void)
+    {
+        return mat_;
+    }
+private:
+    FMat     &mat_;
+    SolverFn fn_;
+};
+
+END_HADRONS_NAMESPACE
+
+#endif // Hadrons_Solver_hpp_