author | Pat Downey <patrick.downey@nokia.com> |
Thu, 25 Jun 2009 15:59:54 +0100 | |
changeset 1 | 0a7b44b10206 |
child 2 | 806186ab5e14 |
permissions | -rw-r--r-- |
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// Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of the License "Symbian Foundation License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.symbianfoundation.org/legal/sfl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// e32\euser\maths\um_log.cpp |
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// Floating point base 10 logarithm |
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// |
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// |
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#include "um_std.h" |
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#if defined(__USE_VFP_MATH) && !defined(__CPU_HAS_VFP) |
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#error __USE_VFP_MATH was defined but not __CPU_HAS_VFP - impossible combination, check variant.mmh |
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#endif |
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#ifndef __USE_VFP_MATH |
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EXPORT_C TInt Math::Log(TReal &aTrg,const TReal &aSrc) |
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/** |
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Calculates the logarithm to base 10 of a number. |
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@param aTrg A reference containing the result. |
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@param aSrc The number whose logarithm is required. |
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@return KErrNone if successful, otherwise another of |
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the system-wide error codes. |
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*/ |
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// |
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// Base 10 log routine. See Software manual by W.J.Cody & W.Waite |
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// |
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{ |
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TInt ret=Math::Ln(aTrg,aSrc); |
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if (ret!=KErrNone) |
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return(ret); |
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aTrg*=KRln10; |
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return(ret); |
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} |
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#else // __USE_VFP_MATH |
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// definitions come from RVCT math library |
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extern "C" TReal log10(TReal); |
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EXPORT_C TInt Math::Log(TReal& aTrg, const TReal& aSrc) |
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{ |
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aTrg = log10(aSrc); |
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if (Math::IsFinite(aTrg)) |
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return KErrNone; |
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if (Math::IsInfinite(aTrg)) |
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return KErrOverflow; |
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SetNaN(aTrg); |
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return KErrArgument; |
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} |
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#endif |