Product.h

/**************************************************************************
* BASF2 (Belle Analysis Framework 2)                                     *
* Copyright(C) 2015 - Belle II Collaboration                             *
*                                                                        *
* Author: The Belle II Collaboration                                     *
* Contributors: Oliver Frost                                             *
*                                                                        *
* This software is provided "as is" without any warranty.                *
**************************************************************************/
#pragma once
 
#include <type_traits>
#include <cstddef>
 
namespace Belle2 {
  namespace TrackFindingCDC {
    template<std::size_t... factors>
    struct Product;
 
    template<std::size_t factor, std::size_t... factors>
    struct Product<factor, factors...> :
      std::integral_constant<std::size_t, factor* Product<factors...>::value > {};
 
    template<>
    struct Product<> :
      std::integral_constant<std::size_t, 1> {};
 
  }
}