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/*
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* Copyright (c) 2003-2005 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 "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-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: Variant data type for AIW generic parameters.
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*
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*/
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#ifndef AIW_VARIANT_H
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#define AIW_VARIANT_H
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// INCLUDES
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#include <e32std.h>
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#include <s32strm.h>
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#include <f32file.h>
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#include "AiwVariantType.hrh"
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// FORWARD DECLARATIONS
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// CLASS DECLARATION
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/**
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* Variant data class to hold a value of a TAiwGenericParam instance.
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* The variant contains a data type and a value. This class is attached to
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* TAiwGenericParam instance which holds the semantic type of the value.
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*
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* @lib ServiceHandler.lib
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* @since Series 60 2.6
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* @see TAiwGenericParam
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*/
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class TAiwVariant
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{
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public: // Constructors
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/**
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* Default constructor. Initializes this variant to be empty.
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*
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* @post IsEmpty()
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*/
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inline TAiwVariant();
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/**
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* Constructor from a value.
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*
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* @param aValue The value to set for this variant object.
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*/
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inline TAiwVariant(TInt32 aValue);
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/**
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* Constructor from a value.
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*
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* @param aValue The value to set for this variant object.
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*/
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inline TAiwVariant(const TUid& aValue);
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/**
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* Constructor from a value.
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*
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* @param aValue The value to set for this variant object.
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*/
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inline TAiwVariant(const TTime& aValue);
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/**
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* Constructor from a value.
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*
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* @param aValue The value to set for this variant object.
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*/
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inline TAiwVariant(const TDesC& aValue);
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/**
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* Constructor from a value.
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*
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* @param aValue The value to set for this variant object.
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*/
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inline TAiwVariant(const HBufC* aValue);
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/**
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* Constructor from a value.
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*
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* @param aValue The value to set for this variant object.
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*/
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inline TAiwVariant(const TDesC8& aValue);
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/**
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* Constructor from a value.
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*
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* @param aValue The value to set for this variant object.
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*/
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inline TAiwVariant(const RFile& aValue);
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/**
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* Copy constructor. Does not take ownership of data.
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*
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* @param aSrc The source object.
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*/
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IMPORT_C TAiwVariant(const TAiwVariant& aSrc);
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/**
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* Assignment operator. Does not take ownership of data.
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*
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* @param aValue The source object.
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*/
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IMPORT_C TAiwVariant& TAiwVariant::operator=(const TAiwVariant& aValue);
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// This class does not need a destructor because memory allocation
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// policy for variant class has been implemented by TAiwGenericParam
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// class.
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public: // Interface
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/**
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* Returns the type id of data this variant object is holding.
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*/
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inline TVariantTypeId TypeId() const;
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/**
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* Returns ETrue if this variant is empty (it does not hold any value).
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*/
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inline TBool IsEmpty() const;
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/**
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* Retrieves the value held by this variant.
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*
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* @param aValue If this variant's type does not match the
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* parameter type, the parameter will not be modified.
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* @return ETrue if aValue was set, EFalse if types did not match.
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*/
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IMPORT_C TBool Get(TInt32& aValue) const;
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/**
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* Retrieves the value held by this variant.
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*
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* @param aValue If this variant's type does not match the
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* parameter type, the parameter will not be modified.
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* @return ETrue if aValue was set, EFalse if types did not match.
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*/
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IMPORT_C TBool Get(TUid& aValue) const;
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/**
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* Retrieves the value held by this variant.
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*
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* @param aValue If this variant's type does not match the
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* parameter type, the parameter will not be modified.
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* @return ETrue if aValue was set, EFalse if types did not match.
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*/
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IMPORT_C TBool Get(TPtrC& aValue) const;
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/**
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* Retrieves the value held by this variant.
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*
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* @param aValue If this variant's type does not match the
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* parameter type, the parameter will not be modified.
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* @return ETrue if aValue was set, EFalse if types did not match.
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*/
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IMPORT_C TBool Get(TTime& aValue) const;
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/**
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* Retrieves the value held by this variant.
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*
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* @param aValue If this variant's type does not match the
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* parameter type, the parameter will not be modified.
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* @return ETrue if aValue was set, EFalse if types did not match.
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*/
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IMPORT_C TBool Get(TPtrC8& aValue) const;
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/**
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* Retrieves the value held by this variant.
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*
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* @param aValue If this variant's type does not match the
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* parameter type, the parameter will not be modified.
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* @return ETrue if aValue was set, EFalse if types did not match.
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*/
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IMPORT_C TBool Get(RFile& aValue) const;
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/**
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* Returns the value held by this variant.
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*
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* @return The value held by this variant. If the data type does not
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* match the function, the default initialized data is returned.
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*/
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IMPORT_C TInt32 AsTInt32() const;
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/**
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* Returns the value held by this variant.
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*
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* @return The value held by this variant. If the data type does not
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* match the function, the default initialized data is returned.
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*/
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IMPORT_C TUid AsTUid() const;
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/**
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* Returns the value held by this variant.
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*
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* @return The value held by this variant. If the data type does not
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* match the function, the default initialized data is returned.
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*/
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IMPORT_C TPtrC AsDes() const;
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/**
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* Returns the value held by this variant.
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*
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* @return The value held by this variant. If the data type does not
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* match the function, the default initialized data is returned.
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*/
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IMPORT_C TTime AsTTime() const;
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/**
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* Returns the value held by this variant.
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*
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* @return The value held by this variant. If the data type does not
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* match the function, the default initialized data is returned.
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*/
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IMPORT_C TPtrC8 AsData() const;
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/**
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* Returns the value held by this variant.
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*
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* @return The value held by this variant. If the data type does not
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* match the function, the default initialized data is returned.
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*/
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IMPORT_C RFile AsFileHandle() const;
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/**
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* Deletes possibly set value and resets this variant to empty.
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*
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* @post IsEmpty()
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*/
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IMPORT_C void Reset();
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/**
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* Sets integer value to this variant. The previous value is overwritten.
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*
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* @param aValue Value for this variant object to hold.
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* @post *this == aValue
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*/
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IMPORT_C void Set(TInt32 aValue);
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/**
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* Sets unique ID value to this variant. The previous value is overwritten.
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*
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* @param aValue Value for this variant object to hold.
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* @post *this == aValue
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*/
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IMPORT_C void Set(const TUid& aValue);
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/**
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* Sets date and time value to this variant. The previous value is overwritten.
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*
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* @param aValue Value for this variant object to hold.
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* @post *this == aValue
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*/
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IMPORT_C void Set(const TTime& aValue);
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/**
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* Sets constant text reference to this variant.
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*
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* @param aValue Text value for this variant object to hold.
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* @post *this == aValue
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*/
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IMPORT_C void Set(const TDesC& aValue);
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/**
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* Sets constant text reference to this variant.
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*
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* @param aValue Text value for this variant object to hold.
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* Ownership is not taken.
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*/
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inline void Set(const HBufC* aValue);
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/**
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* Sets constant 8-bit text reference to this variant.
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*
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* @param aValue Text value for this variant object to hold.
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* @post *this == aValue
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*/
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IMPORT_C void Set(const TDesC8& aValue);
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/**
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* Sets RFile file handle to this variant.
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*
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* @param aValue File handle for this variant object to hold.
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* @post *this == aValue
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*/
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IMPORT_C void Set(const RFile& aValue);
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/**
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* Assignment operator for the variant.
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*
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* @param aValue The source object.
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*/
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inline TAiwVariant& operator=(const TTime& aValue);
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/**
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* Assignment operator for the variant.
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*
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* @param aValue The source object.
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*/
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inline TAiwVariant& operator=(const TUid& aValue);
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/**
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* Assignment operator for the variant.
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*
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* @param aValue The source object.
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*/
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inline TAiwVariant& operator=(TInt32 aValue);
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williamr@2
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williamr@2
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/**
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williamr@2
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* Assignment operator for the variant.
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williamr@2
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*
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williamr@2
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* @param aValue The source object.
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williamr@2
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*/
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williamr@2
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inline TAiwVariant& operator=(const TDesC& aValue);
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williamr@2
|
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williamr@2
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/**
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williamr@2
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* Assignment operator for the variant.
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williamr@2
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*
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williamr@2
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* @param aValue The source object.
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williamr@2
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*/
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williamr@2
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inline TAiwVariant& operator=(const HBufC* aValue);
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williamr@2
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331 |
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williamr@2
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/**
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williamr@2
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* Assignment operator for the variant.
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williamr@2
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*
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williamr@2
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* @param aValue The source object.
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williamr@2
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*/
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williamr@2
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inline TAiwVariant& operator=(const TDesC8& aValue);
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williamr@2
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williamr@2
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/**
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williamr@2
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* Assignment operator for the variant.
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williamr@2
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*
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williamr@2
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* @param aValue The source object.
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williamr@2
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*/
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williamr@2
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inline TAiwVariant& operator=(const RFile& aValue);
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williamr@2
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private:
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williamr@2
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/**
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williamr@2
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* Streaming support for TAiwGenericParam.
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williamr@2
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* Internalizes this variant from a stream.
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williamr@2
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*/
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williamr@2
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351 |
void InternalizeL(RReadStream& aStream);
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williamr@2
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352 |
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williamr@2
|
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/**
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williamr@2
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354 |
* Streaming support for TAiwGenericParam.
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williamr@2
|
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* Externalizes this variant to a stream.
|
williamr@2
|
356 |
*/
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williamr@2
|
357 |
void ExternalizeL(RWriteStream& aStream) const;
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williamr@2
|
358 |
|
williamr@2
|
359 |
/**
|
williamr@2
|
360 |
* Streaming support for TAiwGenericParam.
|
williamr@2
|
361 |
* Returns the maximum externalized size of this variant in bytes.
|
williamr@2
|
362 |
*/
|
williamr@2
|
363 |
TInt Size() const;
|
williamr@2
|
364 |
|
williamr@2
|
365 |
/**
|
williamr@2
|
366 |
* Data copying support for TAiwGenericParam.
|
williamr@2
|
367 |
* Sets the copy of given variant value to this variant
|
williamr@2
|
368 |
* @param aValue variant value for this variant object to hold.
|
williamr@2
|
369 |
* @post *this == aValue
|
williamr@2
|
370 |
*/
|
williamr@2
|
371 |
void SetL(const TAiwVariant& aValue);
|
williamr@2
|
372 |
|
williamr@2
|
373 |
/**
|
williamr@2
|
374 |
* Destroys any dynamic resource owned by this variant.
|
williamr@2
|
375 |
*/
|
williamr@2
|
376 |
void Destroy();
|
williamr@2
|
377 |
|
williamr@2
|
378 |
/// Debug invariant
|
williamr@2
|
379 |
void __DbgTestInvariant() const;
|
williamr@2
|
380 |
|
williamr@2
|
381 |
private: // Data
|
williamr@2
|
382 |
/// Type of the data this variant is holding
|
williamr@2
|
383 |
TUint8 iTypeId;
|
williamr@2
|
384 |
|
williamr@2
|
385 |
/// POD storage for a 64-bit integer
|
williamr@2
|
386 |
struct SInt64
|
williamr@2
|
387 |
{
|
williamr@2
|
388 |
TInt32 iLow;
|
williamr@2
|
389 |
TInt32 iHigh;
|
williamr@2
|
390 |
void InternalizeL(RReadStream& aStream);
|
williamr@2
|
391 |
void ExternalizeL(RWriteStream& aStream) const;
|
williamr@2
|
392 |
void Set(const TInt64& aTInt64);
|
williamr@2
|
393 |
operator TInt64() const;
|
williamr@2
|
394 |
TBool operator==(const SInt64& aRhs) const;
|
williamr@2
|
395 |
};
|
williamr@2
|
396 |
|
williamr@2
|
397 |
// Data value stored in this variant.
|
williamr@2
|
398 |
// One of these are effective at a time depending on the iTypeId
|
williamr@2
|
399 |
//
|
williamr@2
|
400 |
union UData
|
williamr@2
|
401 |
{
|
williamr@2
|
402 |
TInt32 iInt32; // 32-bit integer
|
williamr@2
|
403 |
SInt64 iInt64; // 64-bit integer
|
williamr@2
|
404 |
HBufC* iBufC; // owned string pointer
|
williamr@2
|
405 |
HBufC8* iBufC8; // owned 8-bit data pointer
|
williamr@2
|
406 |
};
|
williamr@2
|
407 |
|
williamr@2
|
408 |
UData iData; // Data union
|
williamr@2
|
409 |
TPtrC iPtrC; // Pointer to string
|
williamr@2
|
410 |
TPtrC8 iPtrC8; // Pointer to 8-bit data
|
williamr@2
|
411 |
|
williamr@2
|
412 |
private: // friend declarations
|
williamr@2
|
413 |
friend IMPORT_C TBool operator==(const TAiwVariant& aLhs, const TAiwVariant& aRhs);
|
williamr@2
|
414 |
/// TAiwGenericParam needs access to private streaming and copying methods.
|
williamr@2
|
415 |
friend class TAiwGenericParam;
|
williamr@2
|
416 |
|
williamr@2
|
417 |
};
|
williamr@2
|
418 |
|
williamr@2
|
419 |
|
williamr@2
|
420 |
// FUNCTIONS
|
williamr@2
|
421 |
|
williamr@2
|
422 |
/**
|
williamr@2
|
423 |
* Returns ETrue if two variants are equal.
|
williamr@2
|
424 |
*
|
williamr@2
|
425 |
* @param aLhs Left hand side.
|
williamr@2
|
426 |
* @param aRhs Right hand side.
|
williamr@2
|
427 |
* @return ETrue if equal, EFalse otherwise.
|
williamr@2
|
428 |
*/
|
williamr@2
|
429 |
IMPORT_C TBool operator==(const TAiwVariant& aLhs, const TAiwVariant& aRhs);
|
williamr@2
|
430 |
|
williamr@2
|
431 |
/**
|
williamr@2
|
432 |
* Returns ETrue if two variants are not equal.
|
williamr@2
|
433 |
*
|
williamr@2
|
434 |
* @param aLhs Left hand side.
|
williamr@2
|
435 |
* @param aRhs Right hand side.
|
williamr@2
|
436 |
* @return ETrue if not equal, EFalse otherwise.
|
williamr@2
|
437 |
*/
|
williamr@2
|
438 |
inline TBool operator!=(const TAiwVariant& aLhs, const TAiwVariant& aRhs);
|
williamr@2
|
439 |
|
williamr@2
|
440 |
/**
|
williamr@2
|
441 |
* Dumps the contents of aVariant to debug output. Available only in debug builds.
|
williamr@2
|
442 |
*
|
williamr@2
|
443 |
* @param aVariant The object to be dumped.
|
williamr@2
|
444 |
*/
|
williamr@2
|
445 |
void Dump(const TAiwVariant& aVariant);
|
williamr@2
|
446 |
|
williamr@2
|
447 |
|
williamr@2
|
448 |
// INLINE FUNCTIONS
|
williamr@4
|
449 |
#include "AiwVariant.inl"
|
williamr@2
|
450 |
|
williamr@2
|
451 |
#endif // AIW_VARIANT_H
|
williamr@2
|
452 |
|
williamr@2
|
453 |
// End of File
|