Grid/lib/lattice/Lattice_trace.h

    /*************************************************************************************

    Grid physics library, www.github.com/paboyle/Grid 

    Source file: ./lib/lattice/Lattice_trace.h

    Copyright (C) 2015

Author: Peter Boyle <paboyle@ph.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 GRID_LATTICE_TRACE_H
#define GRID_LATTICE_TRACE_H

///////////////////////////////////////////////
// Tracing, transposing, peeking, poking
///////////////////////////////////////////////

namespace Grid {

    ////////////////////////////////////////////////////////////////////////////////////////////////////
    // Trace
    ////////////////////////////////////////////////////////////////////////////////////////////////////
    template<class vobj>
    inline auto trace(const Lattice<vobj> &lhs)
      -> Lattice<decltype(trace(lhs._odata[0]))>
    {
      Lattice<decltype(trace(lhs._odata[0]))> ret(lhs._grid);
      parallel_for(int ss=0;ss<lhs._grid->oSites();ss++){
            ret._odata[ss] = trace(lhs._odata[ss]);
        }
        return ret;
    };
    
    ////////////////////////////////////////////////////////////////////////////////////////////////////
    // Trace Index level dependent operation
    ////////////////////////////////////////////////////////////////////////////////////////////////////
    template<int Index,class vobj>
    inline auto TraceIndex(const Lattice<vobj> &lhs) -> Lattice<decltype(traceIndex<Index>(lhs._odata[0]))>
    {
      Lattice<decltype(traceIndex<Index>(lhs._odata[0]))> ret(lhs._grid);
      parallel_for(int ss=0;ss<lhs._grid->oSites();ss++){
	ret._odata[ss] = traceIndex<Index>(lhs._odata[ss]);
      }
      return ret;
    };


}
#endif