ConstExpressions.h

 
#pragma once
 
#if defined(ConstExpressions_RECURSES)
#error Recursive header files inclusion detected in ConstExpressions.h
#else // defined(ConstExpressions_RECURSES)
#define ConstExpressions_RECURSES
 
#if !defined ConstExpressions_h
#define ConstExpressions_h
 
// Inclusions
#include <iostream>
#include "DGtal/base/Common.h"
 
namespace DGtal
{
 
  namespace functions {
    template< typename T >
    constexpr T const_pow( T b, unsigned int e) {
      return e == 0 ? T(1) : b * const_pow( b, e - 1 );
    }
 
    template< typename T >
    constexpr T const_middle( T K, unsigned int e ) {
      return e <= 1
        ? T( K )
        : K * const_pow( 2 * K + 1, e - 1 ) + const_middle( K, e - 1 );
    }
  } // namespace functions
 
} // namespace DGtal
 
 
//                                                                           //
 
#endif // !defined ConstExpressions_h
 
#undef ConstExpressions_RECURSES
#endif // else defined(ConstExpressions_RECURSES)