HG_REPOSITORIES/LPP/INSTRUMENTATION/USERS/JEANDET/SciQLOPCore Files · include/Common/Numeric.h

Few methods added to ease integration in existing GUI...

Few methods added to ease integration in existing GUI Signed-off-by: Alexis Jeandet <alexis.jeandet@member.fsf.org>

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             Numeric.h
        
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      #ifndef NUMERIC_H

      #define NUMERIC_H

      #include <cmath>

      #include <limits>

      #include <type_traits>

      #include <algorithm>

      namespace SciQLop::numeric {

      /*

       taken from here https://en.cppreference.com/w/cpp/types/numeric_limits/epsilon

      */

      template<class T>

      typename std::enable_if<!std::numeric_limits<T>::is_integer, bool>::type

          almost_equal(T x, T y, int ulp=1)

      {

          // the machine epsilon has to be scaled to the magnitude of the values used

          // and multiplied by the desired precision in ULPs (units in the last place)

          return std::abs(x-y) <= std::numeric_limits<T>::epsilon() * std::abs(x+y) * ulp

          // unless the result is subnormal

                 || std::abs(x-y) < std::numeric_limits<T>::min();

      }

      }

      #endif

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				#ifndef NUMERIC_H
				#define NUMERIC_H
				#include <cmath>
				#include <limits>
				#include <type_traits>
				#include <algorithm>

				namespace SciQLop::numeric {

				/*
				taken from here https://en.cppreference.com/w/cpp/types/numeric_limits/epsilon
				*/
				template<class T>
				typename std::enable_if<!std::numeric_limits<T>::is_integer, bool>::type
				almost_equal(T x, T y, int ulp=1)
				{
				// the machine epsilon has to be scaled to the magnitude of the values used
				// and multiplied by the desired precision in ULPs (units in the last place)
				return std::abs(x-y) <= std::numeric_limits<T>::epsilon() * std::abs(x+y) * ulp
				// unless the result is subnormal
				\|\| std::abs(x-y) < std::numeric_limits<T>::min();
				}

				}

				#endif