simple_quark_displacement.h

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// -*- C++ -*-
/*! \file
 *  \brief Simple quark displacement
 */
 
#ifndef __simple_quark_displacement_h__
#define __simple_quark_displacement_h__
 
#include "meas/smear/quark_displacement.h"
#include "meas/smear/displacement.h"
 
namespace Chroma 
{
  //! Name and registration
  /*! @ingroup smear */
  namespace SimpleQuarkDisplacementEnv
  {
    bool registerAll();
  
    //! Return the name
    std::string getName();
 
 
    //! Params for simple quark displacement
    /*! @ingroup smear */
    struct Params
    {
      Params() {}
      Params(XMLReader& in, const std::string& path);
      void writeXML(XMLWriter& in, const std::string& path) const;
    
      int              disp_length;          /*!< displacement length */
      int              disp_dir;             /*!< x(0), y(1), z(2) */   
    };
 
 
    //! Simple quark displacement
    /*! @ingroup smear
     *
     * Simple quark displacement object
     */
    template<typename T>
    class QuarkDisplace : public QuarkDisplacement<T>
    {
    public:
      //! Full constructor
      QuarkDisplace(const Params& p) : params(p) {}
      
      //! Displace the quark
      void operator()(T& quark, 
                      const multi1d<LatticeColorMatrix>& u,
                      enum PlusMinus isign) const
      {
        switch (isign)
        {
        case PLUS:
          displacement(u, quark, params.disp_length, params.disp_dir);
          break;
 
        case MINUS:
          displacement(u, quark, -params.disp_length, params.disp_dir);
          break;
 
        default:
          QDP_error_exit("illegal isign in QuarkDisplace");
        }
      }
 
    private:
      //! Hide partial constructor
      QuarkDisplace() {}
 
    private:
      Params  params;   /*!< displacement params */
    };
 
  }  // end namespace
 
  //! Reader
  /*! @ingroup smear */
  void read(XMLReader& xml, const std::string& path, SimpleQuarkDisplacementEnv::Params& param);
 
  //! Writer
  /*! @ingroup smear */
  void write(XMLWriter& xml, const std::string& path, const SimpleQuarkDisplacementEnv::Params& param);
 
}  // end namespace Chroma
 
#endif