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/*
* Copyright (C) 2007-2010 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#ifndef BU_SHARED_CORE_H
#define BU_SHARED_CORE_H
#include "bu/util.h"
#include <stdio.h>
#include <stdarg.h>
namespace Bu
{
template<typename Shell, typename Core>
class SharedCore
{
typedef class SharedCore<Shell, Core> _SharedType;
public:
SharedCore() :
core( NULL ),
iRefCount( NULL )
{
core = _allocateCore();
iRefCount = new int(1);
}
SharedCore( const _SharedType &rSrc ) :
core( NULL ),
iRefCount( NULL )
{
_softCopy( rSrc );
}
virtual ~SharedCore()
{
_deref();
}
SharedCore &operator=( const SharedCore &rhs )
{
if( core == rhs.core )
return *this;
_softCopy( rhs );
return *this;
}
int getRefCount() const
{
return *iRefCount;
}
Shell clone() const
{
Shell s( dynamic_cast<const Shell &>(*this) );
s._hardCopy();
return s;
}
bool isCoreShared( const Shell &rOther ) const
{
return rOther.core == core;
}
protected:
Core *core;
void _hardCopy()
{
if( !core || !iRefCount )
return;
if( (*iRefCount) == 1 )
return;
Core *copy = _copyCore( core );
_deref();
core = copy;
iRefCount = new int( 1 );
}
/**
* Reset core acts like a hard copy, except instead of providing a
* standalone copy of the shared core, it provides a brand new core.
*
* Very useful in functions used to reset the state of an object.
*/
void _resetCore()
{
if( core )
_deref();
core = _allocateCore();
iRefCount = new int( 1 );
}
virtual Core *_allocateCore()
{
return new Core();
}
virtual Core *_copyCore( Core *pSrc )
{
return new Core( *pSrc );
}
virtual void _deallocateCore( Core *pSrc )
{
delete pSrc;
}
private:
void _deref()
{
if( (--(*iRefCount)) == 0 )
{
_deallocateCore( core );
delete iRefCount;
}
core = NULL;
iRefCount = NULL;
}
void _incRefCount()
{
if( iRefCount && core )
++(*iRefCount);
}
void _softCopy( const _SharedType &rSrc )
{
if( core )
_deref();
core = rSrc.core;
iRefCount = rSrc.iRefCount;
_incRefCount();
}
int *iRefCount;
};
};
#undef fin
#undef fout
#endif
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