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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"
//------------------------------------------------------------------------------
VTK_ABI_NAMESPACE_BEGIN
class vtkWeakPointerBaseToObjectBaseFriendship
{
public:
static void AddWeakPointer(vtkObjectBase* r, vtkWeakPointerBase* p);
static void RemoveWeakPointer(vtkObjectBase* r, vtkWeakPointerBase* p) noexcept;
static void ReplaceWeakPointer(
vtkObjectBase* r, vtkWeakPointerBase* bad, vtkWeakPointerBase* good) noexcept;
};
//------------------------------------------------------------------------------
void vtkWeakPointerBaseToObjectBaseFriendship::AddWeakPointer(
vtkObjectBase* r, vtkWeakPointerBase* p)
{
if (r)
{
vtkWeakPointerBase** l = r->WeakPointers;
if (l == nullptr)
{
// create a new list if none exists
l = new vtkWeakPointerBase*[2];
l[0] = p;
l[1] = nullptr;
r->WeakPointers = l;
}
else
{
size_t n = 0;
while (l[n] != nullptr)
{
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] = nullptr;
}
}
}
//------------------------------------------------------------------------------
void vtkWeakPointerBaseToObjectBaseFriendship::RemoveWeakPointer(
vtkObjectBase* r, vtkWeakPointerBase* p) noexcept
{
if (r)
{
vtkWeakPointerBase** l = r->WeakPointers;
if (l != nullptr)
{
size_t i = 0;
while (l[i] != nullptr && l[i] != p)
{
i++;
}
while (l[i] != nullptr)
{
l[i] = l[i + 1];
i++;
}
if (l[0] == nullptr)
{
delete[] l;
r->WeakPointers = nullptr;
}
}
}
}
//------------------------------------------------------------------------------
void vtkWeakPointerBaseToObjectBaseFriendship::ReplaceWeakPointer(
vtkObjectBase* r, vtkWeakPointerBase* bad, vtkWeakPointerBase* good) noexcept
{
if (r)
{
vtkWeakPointerBase** l = r->WeakPointers;
if (l != nullptr)
{
for (; *l != nullptr; ++l)
{
if (*l == bad)
{
*l = good;
break;
}
}
}
}
}
//------------------------------------------------------------------------------
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(vtkWeakPointerBase&& r) noexcept
: Object(r.Object)
{
r.Object = nullptr;
vtkWeakPointerBaseToObjectBaseFriendship::ReplaceWeakPointer(this->Object, &r, this);
}
//------------------------------------------------------------------------------
vtkWeakPointerBase::~vtkWeakPointerBase()
{
vtkWeakPointerBaseToObjectBaseFriendship::RemoveWeakPointer(this->Object, this);
this->Object = nullptr;
}
//------------------------------------------------------------------------------
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;
}
//------------------------------------------------------------------------------
vtkWeakPointerBase& vtkWeakPointerBase::operator=(vtkWeakPointerBase&& r) noexcept
{
if (this != &r)
{
if (this->Object != r.Object)
{
vtkWeakPointerBaseToObjectBaseFriendship::RemoveWeakPointer(this->Object, this);
// WTB std::exchange
this->Object = r.Object;
r.Object = nullptr;
vtkWeakPointerBaseToObjectBaseFriendship::ReplaceWeakPointer(this->Object, &r, 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());
}
VTK_ABI_NAMESPACE_END
|
