// 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