Constant.h

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#ifndef GAUDIMATH_CONSTANT_H
#define GAUDIMATH_CONSTANT_H 1
// ============================================================================
// Include files
// ============================================================================
// CLHEP
// ============================================================================
#include "CLHEP/GenericFunctions/AbsFunction.hh"
// ============================================================================
#include "GaudiKernel/Kernel.h"

#if defined(__clang__) || defined(__CLING__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Winconsistent-missing-override"
#elif defined(__GNUC__) && __GNUC__ >= 5
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wsuggest-override"
#endif

namespace Genfun // due to CLHEP
{
  namespace GaudiMathImplementation
  {
    class GAUDI_API Constant: public AbsFunction
    {
    public:

      FUNCTION_OBJECT_DEF( Constant )

    public:

      Constant ( const double value ,
                 const size_t dim   ) ;


      unsigned int dimensionality         () const override { return m_DIM   ; }
      bool  hasAnalyticDerivative         () const override { return true    ; }
      double operator()  ( double          ) const override { return m_value ; }
      double operator()  ( const Argument& ) const override { return m_value ; }
      Derivative partial ( unsigned int i  ) const override ;

      // the assignement operator is disabled
      Constant& operator=( const Constant& ) = delete;

    private:

      double m_value ;
      size_t m_DIM   ;

    };

  } // end of namespace GaudiMathImplementation
} // end of namespace Genfun

#if defined(__clang__) || defined(__CLING__)
#pragma clang diagnostic pop
#elif defined(__GNUC__) && __GNUC__ >= 5
#pragma GCC diagnostic pop
#endif

// ============================================================================
// The END
// ============================================================================
#endif // GAUDIMATH_CONSTANT_H
// ============================================================================