Hadrons: moving Hadrons to root directory, build system improvements

Grid/qcd/action/ActionBase.h

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+/*************************************************************************************
+
+Grid physics library, www.github.com/paboyle/Grid
+
+Source file: ./lib/qcd/action/ActionBase.h
+
+Copyright (C) 2015-2016
+
+Author: Peter Boyle <paboyle@ph.ed.ac.uk>
+Author: neo <cossu@post.kek.jp>
+Author: Guido Cossu <guido.cossu@ed.ac.uk>
+
+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 ACTION_BASE_H
+#define ACTION_BASE_H
+
+namespace Grid {
+namespace QCD {
+
+template <class GaugeField >
+class Action 
+{
+
+ public:
+  bool is_smeared = false;
+  // Heatbath?
+  virtual void refresh(const GaugeField& U, GridParallelRNG& pRNG) = 0; // refresh pseudofermions
+  virtual RealD S(const GaugeField& U) = 0;                             // evaluate the action
+  virtual void deriv(const GaugeField& U, GaugeField& dSdU) = 0;        // evaluate the action derivative
+  virtual std::string action_name()    = 0;                             // return the action name
+  virtual std::string LogParameters()  = 0;                             // prints action parameters
+  virtual ~Action(){}
+};
+
+}
+}
+
+#endif // ACTION_BASE_H