lowlevellibsandfws/apputils/inc/BALIBA.H
author Shabe Razvi <shaber@symbian.org>
Tue, 29 Jun 2010 11:29:33 +0100
branchRCL_3
changeset 40 ddd39d92c350
parent 0 e4d67989cc36
permissions -rw-r--r--
Bug 3123 - libstdcppv5.dll fails to link due to missing symbols
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// Copyright (c) 1997-2009 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 "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:
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// Written by Brendan, Dec 1996
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// Library associated files for pluggable components
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// 
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//
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#if !defined(__LIBASSOC_H__)
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#define __LIBASSOC_H__
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#if !defined(__F32FILE_H__)
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#include <f32file.h>
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#endif
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class TLibAssocBase
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/**
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@publishedAll
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@released
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This is an implementation base class for TLibAssoc.
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*/
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	{
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protected:
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	inline TLibAssocBase();
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	IMPORT_C TLibAssocBase(const RLibrary& aLib,TAny* aPtr);
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	IMPORT_C void Set(const RLibrary& aLib,TAny* aPtr);
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	IMPORT_C static void DoUnload(TAny* aThis);
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public:
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	inline TBool IsNull() const;
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private:
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	RLibrary iLibrary;
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protected:
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    /**
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    A Pointer to the class instance.
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    */
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	TAny* iPtr;
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	};
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//	class TLibAssoc inlines
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inline TLibAssocBase::TLibAssocBase()
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	: iPtr(NULL)
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/**
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Default constructor.
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It sets the member TLibAssocBase::iPtr to NULL.
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*/	
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	{}
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inline TBool TLibAssocBase::IsNull() const
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/**
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Tests whether the pointer to the class instance is NULL.
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@return ETrue, if the pointer is NULL; EFalse, otherwise.
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*/
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	{return iPtr==NULL;}
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//
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//	class TLibAssoc
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//
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template <class T>
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class TLibAssoc : public TLibAssocBase
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/**
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@publishedAll
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@released
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Associates a dynamically loadable DLL and an instance of a class that,
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typically, will have been created using the ordinal 1 function of that DLL.
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An object of this type is useful when cleanup behaviour requires that
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a class instance be deleted and the associated DLL be closed.
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The DLL is expected to be already open when the TLibAssoc object is created.
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*/
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	{
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public:
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	inline TLibAssoc();
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	inline TLibAssoc(const RLibrary& aLib,T* aClass);
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	inline void Set(const RLibrary& aLib,T* aClass);
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	//
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	inline void Unload();
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	//
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	inline operator TCleanupItem();
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	operator TLibAssoc*(); // undefined, but here to prevent accidental delete(TLibAssoc)
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	//
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	inline T* Ptr();
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	inline const T* PtrC() const;
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	//
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	inline operator T*();
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	inline operator const T*() const;
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	//
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	inline T* operator->();
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	inline const T* operator->() const;
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private:
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	static void Cleanup(TAny* aThis); // for TCleanupOperation
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	};
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template <class T>
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inline TLibAssoc<T>::TLibAssoc()
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/**
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Default constructor.
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An association between a DLL and a class instance can be made
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after construction using the Set() function.
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*/
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	{}
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template <class T>
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inline TLibAssoc<T>::TLibAssoc(const RLibrary& aLib,T* aClass)
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	: TLibAssocBase(aLib,aClass)
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/**
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Constructs the object taking the specified DLL and an instance of
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the specified class.
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@param aLib   A reference to a DLL that has already been opened.
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@param aClass A pointer to an object to be associated with the DLL.
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              Typically, this object will have been created using
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              the ordinal 1 function from that DLL.
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*/	
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	{}
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template <class T>
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inline void TLibAssoc<T>::Set(const RLibrary& aLib,T* aClass)
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/**
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Makes an association between the specified DLL and an instance of
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the specified class.
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@param aLib   A reference to a DLL that has already been opened.
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@param aClass A pointer to an object to be associated with the DLL.
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              Typically, this object will have been created using
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              the ordinal 1 function from that DLL.
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*/
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	{TLibAssocBase::Set(aLib,aClass);}
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template <class T>
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inline T* TLibAssoc<T>::Ptr()
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/**
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Gets a pointer to the class instance.
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@return A pointer to the class instance.
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*/
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	{return (T*)iPtr;}
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template <class T>
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inline const T* TLibAssoc<T>::PtrC() const
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/**
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Gets a pointer to the const class instance.
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@return A pointer to the const class instance.
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*/
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	{return (const T*)iPtr;}
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template <class T>
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inline TLibAssoc<T>::operator T*()
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/**
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Conversion operator.
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Invoked by the compiler when a TLibAssoc<T> type is passed to a function that
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is prototyped to take a T* type.
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*/
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	{return (T*)iPtr;}
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template <class T>
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inline TLibAssoc<T>::operator const T*() const
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/**
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Const conversion operator.
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Invoked by the compiler when a TLibAssoc<T> type is passed to a function that
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is prototyped to take a const T* type.
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*/
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	{return (const T*)iPtr;}
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template <class T>
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inline T* TLibAssoc<T>::operator->()
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/**
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Dereferencing operator.
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@return A pointer to the class instance.
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*/
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	{return (T*)iPtr;}
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template <class T>
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inline const T* TLibAssoc<T>::operator->() const
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/**
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Const dereferencing operator.
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@return A pointer to the const class instance.
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*/
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	{return (const T*)iPtr;}
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template <class T>
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inline TLibAssoc<T>::operator TCleanupItem()
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/**
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The TCleanupItem conversion operator.
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Invoked by the compiler when a TLibAssoc<T> type is passed to a function that
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is prototyped to take a TCleanupItem type.
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The most common usage is to put a cleanup item onto the cleanup stack using
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CleanupStack::PushL(). The cleanup operation is represented by the private
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static function Cleanup().
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For example, if we declare
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@code
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TLibAssoc<A> a;
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@endcode 
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then we can simply put a cleanup item onto the cleanup stack
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by calling
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@code
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CleanupStack::PushL(a);
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@endcode
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@see TCleanupItem
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@see CleanupStack::PushL
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*/
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	{return(TCleanupItem(Cleanup,this));}
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template <class T>
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inline void TLibAssoc<T>::Unload()
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/**
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Deletes the class instance and calls Close() on the associated DLL.
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@see RLibrary::Close
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*/
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	{Cleanup(this);}
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template <class T>
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void TLibAssoc<T>::Cleanup(TAny* aThis)
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/**
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The cleanup operation.
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The implementation deletes the class instance and calls Close() on
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the associated DLL.
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Note that this function is internal and is not intended for use; it is documented
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for completeness.
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*/
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	{
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	delete (T*)(((TLibAssoc<T>*)aThis)->iPtr);
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	TLibAssocBase::DoUnload(aThis);
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	}
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#endif