// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the License "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// e32\euser\maths\um_spec.cpp

// Functions to check for  and set special values

// 

//

#include "um_std.h"

#ifndef __REALS_MACHINE_CODED__

EXPORT_C TBool Math::IsZero(const TReal &aVal)

/**

Determines whether a value is zero.

@param aVal A reference to the value to be checked. 

@return True, if aVal is zero; false, otherwise.

*/

	{

	SReal64 *pS=(SReal64 *)&aVal;

	if (pS->msm==0 && pS->lsm==0 && pS->exp==KTReal64ZeroExponent)

		return TRUE;

	else

		return FALSE;

	}

EXPORT_C TBool Math::IsNaN(const TReal &aVal)

/**

Determines whether a value is not a number.

@param aVal A reference to the value to be checked. 

@return True, if aVal is not a number; false, otherwise.

*/

	{

	SReal64 *pS=(SReal64 *)&aVal;

	if (pS->exp==KTReal64SpecialExponent && (pS->msm|pS->lsm)!=0)

		return TRUE;

	else

		return FALSE;

	}

EXPORT_C TBool Math::IsInfinite(const TReal &aVal)

/**

Determines whether a value is infinite.

@param aVal A reference to the value to be checked.

@return True, if aVal is infinite; false, otherwise.

*/

	{

	SReal64 *pS=(SReal64 *)&aVal;

	if (pS->msm==0 && pS->lsm==0 && pS->exp==KTReal64SpecialExponent)

		return TRUE;

	else 

		return FALSE;

	}

EXPORT_C TBool Math::IsFinite(const TReal &aVal)

/**

Determines whether a value is finite.

In this context, a value is finite if it is a valid number and

is not infinite.

@param aVal A reference to the value to be checked.

@return True, if aVal is finite; false, otherwise.

*/

	{

	SReal64 *pS=(SReal64 *)&aVal;

	if (pS->exp!=KTReal64SpecialExponent)

		return TRUE;

	else 

		return FALSE;

	}

EXPORT_C void Math::SetZero(TReal &aVal,TInt aSign)

//

// Constructs zeros, assuming default sign is positive

//

	{

	SReal64 *pS=(SReal64 *)&aVal;

	pS->sign=aSign;

	pS->exp=KTReal64ZeroExponent;

	pS->msm=0;

	pS->lsm=0;

	}

EXPORT_C void Math::SetNaN(TReal &aVal)

//

// Constructs NaN (+ve sign for Java)

//

	{

	SReal64 *pS=(SReal64 *)&aVal;

	pS->sign=0;

	pS->exp=KTReal64SpecialExponent;

	pS->msm=0xfffffu;

	pS->lsm=0xffffffffu;

	}

EXPORT_C void Math::SetInfinite(TReal &aVal,TInt aSign)

//

// Constructs infinities

//

	{

	SReal64 *pS=(SReal64 *)&aVal;

	pS->sign=aSign;

	pS->exp=KTReal64SpecialExponent;

	pS->msm=0;

	pS->lsm=0;

	}

#endif