ExpressionTemplates.h

 
#pragma once
 
#if defined(ExpressionTemplates_RECURSES)
#error Recursive header files inclusion detected in ExpressionTemplates.h
#else // defined(ExpressionTemplates_RECURSES)
#define ExpressionTemplates_RECURSES
 
#if !defined ExpressionTemplates_h
#define ExpressionTemplates_h
 
// Inclusions
#include <iostream>
#include "DGtal/base/Common.h"
 
namespace DGtal
{
 
  template <int X, unsigned exponent> class POW
  {
  public:  enum{ VALUE = X* POW<X, exponent-1>::VALUE};
  };
  template <int X > class POW<X, 1>
  {
  public:  enum{ VALUE = X };
  };
  template <int X > class POW<X, 0>
  {
  public:  enum { VALUE = 1 };
  };
 
  template <int X>
  class LOG2
  {
  public:  enum{ VALUE = 1 +  LOG2<X / 2>::VALUE};
  };
  template <> class LOG2<2>
  {
  public:  enum{ VALUE = 1 };
  };
  template <> class LOG2<1>
  {
  public:  enum{ VALUE = 0 };
  };} // namespace DGtal
 
 
//                                                                           //
 
#endif // !defined ExpressionTemplates_h
 
#undef ExpressionTemplates_RECURSES
#endif // else defined(ExpressionTemplates_RECURSES)