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///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Industrial Light & Magic nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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///////////////////////////////////////////////////////////////////////////
#ifndef INCLUDED_IEXMATHFLOATEXC_H
#define INCLUDED_IEXMATHFLOATEXC_H
#ifndef IEXMATH_EXPORT_H
#define IEXMATH_EXPORT_H
#if defined(OPENEXR_DLL)
#if defined(IEX_EXPORTS)
#define IEXMATH_EXPORT __declspec(dllexport)
#else
#define IEXMATH_EXPORT __declspec(dllimport)
#endif
#define IEXMATH_EXPORT_CONST
#else
#define IEXMATH_EXPORT
#define IEXMATH_EXPORT_CONST const
#endif
#endif
#include "IexNamespace.h"
#include "IexMathExc.h"
//#include <IexBaseExc.h>
#include "IexMathIeeeExc.h"
IEX_INTERNAL_NAMESPACE_HEADER_ENTER
//-------------------------------------------------------------
// Function mathExcOn() defines which floating point exceptions
// will be trapped and converted to C++ exceptions.
//-------------------------------------------------------------
IEXMATH_EXPORT
void mathExcOn (int when = (IEEE_OVERFLOW | IEEE_DIVZERO | IEEE_INVALID));
//----------------------------------------------------------------------
// Function getMathExcOn() tells you for which floating point exceptions
// trapping and conversion to C++ exceptions is currently enabled.
//----------------------------------------------------------------------
IEXMATH_EXPORT
int getMathExcOn();
//------------------------------------------------------------------------
// A classs that temporarily sets floating point exception trapping
// and conversion, and later restores the previous settings.
//
// Example:
//
// float
// trickyComputation (float x)
// {
// MathExcOn meo (0); // temporarily disable floating
// // point exception trapping
//
// float result = ...; // computation which may cause
// // floating point exceptions
//
// return result; // destruction of meo restores
// } // the program's previous floating
// // point exception settings
//------------------------------------------------------------------------
class IEXMATH_EXPORT MathExcOn
{
public:
MathExcOn (int when)
:
_changed (false)
{
_saved = getMathExcOn();
if (_saved != when)
{
_changed = true;
mathExcOn (when);
}
}
~MathExcOn ()
{
if (_changed)
mathExcOn (_saved);
}
// It is possible for functions to set the exception registers
// yet not trigger a SIGFPE. Specifically, the implementation
// of pow(x, y) we're using can generates a NaN from a negative x
// and fractional y but a SIGFPE is not generated.
// This function examimes the exception registers and calls the
// fpHandler if those registers modulo the exception mask are set.
// It should be called wherever this class is commonly used where it has
// been found that certain floating point exceptions are not being thrown.
void handleOutstandingExceptions();
private:
bool _changed;
int _saved;
};
IEX_INTERNAL_NAMESPACE_HEADER_EXIT
#endif
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