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/*=========================================================================
Program: Visualization Toolkit
Module: vtkWeakPointerBase.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkWeakPointerBase.h"
//----------------------------------------------------------------------------
class vtkWeakPointerBaseToObjectBaseFriendship
{
public:
static void AddWeakPointer(vtkObjectBase *r, vtkWeakPointerBase *p);
static void RemoveWeakPointer(vtkObjectBase *r, vtkWeakPointerBase *p);
};
//----------------------------------------------------------------------------
void vtkWeakPointerBaseToObjectBaseFriendship::AddWeakPointer(
vtkObjectBase *r, vtkWeakPointerBase *p)
{
if (r)
{
vtkWeakPointerBase **l = r->WeakPointers;
if (l == 0)
{
// create a new list if none exists
l = new vtkWeakPointerBase *[2];
l[0] = p;
l[1] = 0;
r->WeakPointers = l;
}
else
{
size_t n = 0;
while (l[n] != 0) { n++; }
// if n+1 is a power of two, double the list size
if ((n & (n+1)) == 0)
{
vtkWeakPointerBase **t = l;
l = new vtkWeakPointerBase *[(n+1)*2];
for (size_t i = 0; i < n; i++)
{
l[i] = t[i];
}
delete [] t;
r->WeakPointers = l;
}
// make sure list is null-terminated
l[n++] = p;
l[n] = 0;
}
}
}
//----------------------------------------------------------------------------
void vtkWeakPointerBaseToObjectBaseFriendship::RemoveWeakPointer(
vtkObjectBase *r, vtkWeakPointerBase *p)
{
if (r)
{
vtkWeakPointerBase **l = r->WeakPointers;
if (l != 0)
{
size_t i = 0;
while (l[i] != 0 && l[i] != p)
{
i++;
}
while (l[i] != 0)
{
l[i] = l[i+1];
i++;
}
if (l[0] == 0)
{
delete [] l;
r->WeakPointers = 0;
}
}
}
}
//----------------------------------------------------------------------------
vtkWeakPointerBase::vtkWeakPointerBase(vtkObjectBase* r) :
Object(r)
{
vtkWeakPointerBaseToObjectBaseFriendship::AddWeakPointer(r, this);
}
//----------------------------------------------------------------------------
vtkWeakPointerBase::vtkWeakPointerBase(const vtkWeakPointerBase& r) :
Object(r.Object)
{
vtkWeakPointerBaseToObjectBaseFriendship::AddWeakPointer(r.Object, this);
}
//----------------------------------------------------------------------------
vtkWeakPointerBase::~vtkWeakPointerBase()
{
vtkWeakPointerBaseToObjectBaseFriendship::RemoveWeakPointer(
this->Object, this);
this->Object = 0;
}
//----------------------------------------------------------------------------
vtkWeakPointerBase&
vtkWeakPointerBase::operator=(vtkObjectBase* r)
{
if (this->Object != r)
{
vtkWeakPointerBaseToObjectBaseFriendship::RemoveWeakPointer(
this->Object, this);
this->Object = r;
vtkWeakPointerBaseToObjectBaseFriendship::AddWeakPointer(
this->Object, this);
}
return *this;
}
//----------------------------------------------------------------------------
vtkWeakPointerBase&
vtkWeakPointerBase::operator=(const vtkWeakPointerBase& r)
{
if (this != &r)
{
if (this->Object != r.Object)
{
vtkWeakPointerBaseToObjectBaseFriendship::RemoveWeakPointer(
this->Object, this);
this->Object = r.Object;
vtkWeakPointerBaseToObjectBaseFriendship::AddWeakPointer(
this->Object, this);
}
}
return *this;
}
//----------------------------------------------------------------------------
ostream& operator << (ostream& os, const vtkWeakPointerBase& p)
{
// Just print the pointer value into the stream.
return os << static_cast<void*>(p.GetPointer());
}
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