BeNumerical.h

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/*--------------------------------------------------------------------------------------+
|
|   Supplied under applicable software license agreement.
|
|   Copyright (c) 2018 Bentley Systems, Incorporated. All rights reserved.
|
+---------------------------------------------------------------------------------------*/
#pragma once


#include "Bentley.h"
#include <math.h>
#include <float.h>
#include <algorithm>

BEGIN_BENTLEY_NAMESPACE


/*=================================================================================**/
struct          BeNumerical
{
static double   BeNextafter (double x, double y)    {return _nextafter(x,y);}
static int      BeIsnan (double v)                  {return _isnan(v);}
static int      BeFinite (double v)                 {return _finite(v);}

    BENTLEYDLL_EXPORT static UInt32 ResetFloatingPointExceptions (UInt32 newFpuMask);

    static double NextafterDelta (double sv)
        {
        double v = fabs (sv);
        return BeNextafter (v, DBL_MAX) - v;
        }

    static double ComputeComparisonTolerance (double sv1, double sv2)
        {
        double uv = std::max<double> (fabs(sv1), fabs(sv2));
        return (uv < 1.0)? DBL_EPSILON: NextafterDelta(uv);
        }

    static int Compare (double sv1, double sv2)
        {
        if (fabs (sv2 - sv1) < ComputeComparisonTolerance (sv1, sv2))
            return 0;
        return sv1 < sv2? -1: 1;
        }
};


END_BENTLEY_NAMESPACE