Migration.h

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#ifndef _CLEHP_2_SMATRIX_MIGRATION_H_
#define _CLEHP_2_SMATRIX_MIGRATION_H_

#include "DataFormats/Math/interface/AlgebraicROOTObjects.h"

#include "CLHEP/Matrix/Matrix.h"
#include "CLHEP/Matrix/Vector.h"
#include "CLHEP/Matrix/SymMatrix.h"

#include <cstring>

/*
template <unsigned int N1, unsigned int N2> 
    ROOT::Math::SMatrix<double,N1,N2,ROOT::Math::RepStd<double,N1,N2> > clhep2smatrix(const CLHEP::HepMatrix &mt) {
        typedef ROOT::Math::SMatrix<double,N1,N2,ROOT::Math::RepStd<double,N1,N2> > RM;
        RM rm;
        memcpy(rm.Array(), &matmt(1,1), (N1*N2)*sizeof(double));
        return rm;
    }
template <unsigned int N1> 
    ROOT::Math::SMatrix<double,N1,N1,ROOT::Math::RepSym<double,N1> > clhep2smatrix(const CLHEP::HepSymMatrix &mt) {
        typedef ROOT::Math::SMatrix<double,N1,N1,ROOT::Math::RepSym<double,N1> > RM;
        RM rm;
        memcpy(rm.Array(), &matmt(1,1), (D1*D2)*sizeof(double));
        return rm;
    }
*/

template<unsigned int N1, unsigned int N2> 
    ROOT::Math::SMatrix<double,N1,N2, typename ROOT::Math::MatRepStd<double,N1,N2> > asSMatrix(const CLHEP::HepMatrix &m) {
        typedef typename ROOT::Math::MatRepStd<double,N1,N2>  REP;
        assert(m.num_row() == N1); assert(m.num_col() == N2);
        return  ROOT::Math::SMatrix<double,N1,N2,REP> (&m(1,1), REP::kSize);
    }

template<unsigned int N1> 
    ROOT::Math::SMatrix<double,N1,N1, typename ROOT::Math::MatRepSym<double,N1> > asSMatrix(const CLHEP::HepSymMatrix &m) {
        typedef typename ROOT::Math::MatRepSym<double,N1>  REP;
        assert(m.num_row() == N1);
        return  ROOT::Math::SMatrix<double,N1,N1,REP> (&m(1,1), REP::kSize);
    }

template<unsigned int N1> 
    ROOT::Math::SVector<double,N1> asSVector(const CLHEP::HepVector &m) {
        return  ROOT::Math::SVector<double,N1> (&m[0], N1);
    }

template<unsigned int N> CLHEP::HepVector asHepVector(const ROOT::Math::SVector<double,N> &v) {
    CLHEP::HepVector hv(N);
    memcpy(&hv[0], &v[0], N*sizeof(double));
    return hv;
    }

template<unsigned int N1, unsigned int N2> CLHEP::HepMatrix asHepMatrix (
     const ROOT::Math::SMatrix<double,N1,N2, typename ROOT::Math::MatRepStd<double,N1,N2> > &rm) {
        CLHEP::HepMatrix am(N1,N2);
        memcpy(&am(1,1), rm.Array(), N1*N2*sizeof(double));
        return am;
    }

template<unsigned int N1> CLHEP::HepSymMatrix asHepMatrix (
     const ROOT::Math::SMatrix<double,N1,N1, typename ROOT::Math::MatRepSym<double,N1> > &rm) {
        CLHEP::HepSymMatrix am(N1);
        memcpy(&am(1,1), rm.Array(), (N1*(N1+1))/2*sizeof(double));
        return am;
    }


#endif