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// This code is in the public domain -- Ignacio Castaño <castano@gmail.com>
#pragma once
#ifndef NV_MATH_KAHANSUM_H
#define NV_MATH_KAHANSUM_H
#include "nvmath.h"
namespace nv
{
class KahanSum
{
public:
KahanSum() : accum(0.0f), err(0) {};
void add(float f)
{
float compensated = f + err;
float tmp = accum + compensated;
err = accum - tmp;
err += compensated;
accum = tmp;
}
float sum() const
{
return accum;
}
private:
float accum;
float err;
};
} // nv namespace
#endif // NV_MATH_KAHANSUM_H
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