BinaryOpPolicy.h

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// @(#)root/smatrix:$Id$
// Authors: J. Palacios    2006
#ifndef ROOT_Math_BinaryOpPolicy
#define ROOT_Math_BinaryOpPolicy 1
 
// Include files
 
/** @class BinaryOpPolicy BinaryOpPolicy.h Math/BinaryOpPolicy.h
 *
 *
 *  @author Juan PALACIOS
 *  @date   2006-01-10
 *
 *  Classes to define matrix representation binary combination policy.
 *  At the moment deals with symmetric and generic representation, and
 *  establishes policies for multiplication (and division) and addition
 *  (and subtraction)
 */
 
 
#include "Math/MatrixRepresentationsStatic.h"
 
namespace ROOT {
 
  namespace Math {
 
    /**
       matrix-matrix multiplication policy
     */
    template <class T, class R1, class R2>
    struct MultPolicy
    {
      enum {
         N1 = R1::kRows,
         N2 = R2::kCols
      };
      typedef MatRepStd<T, N1, N2> RepType;
    };
 
    /**
       matrix addition policy
     */
    template <class T, unsigned int D1, unsigned int D2, class R1, class R2>
    struct AddPolicy
    {
      enum {
         N1 = R1::kRows,
         N2 = R1::kCols
      };
      typedef MatRepStd<typename R1::value_type, N1, N2 > RepType;
    };
 
    template <class T, unsigned int D1, unsigned int D2>
    struct AddPolicy<T, D1, D2, MatRepSym<T,D1>, MatRepSym<T,D1> >
    {
      typedef  MatRepSym<T,D1> RepType;
    };
 
    /**
       matrix transpose policy
     */
    template <class T, unsigned int D1, unsigned int D2, class R>
    struct TranspPolicy
    {
      enum {
         N1 = R::kRows,
         N2 = R::kCols
      };
      typedef MatRepStd<T, N2, N1> RepType;
    };
    // specialized case of transpose of sym matrices
    template <class T, unsigned int D1, unsigned int D2>
    struct TranspPolicy<T, D1, D2, MatRepSym<T,D1> >
    {
      typedef MatRepSym<T, D1> RepType;
    };
  }  // namespace Math
 
}  // namespace ROOT
 
#endif // MATH_BINARYOPPOLICY_H