[vtk-developers] Memory leak in vtkSmartPointer

[Nasztanovics Ferenc]

Hi,

I debugged the following code (Is it a correct use case?):
vtkSmartPointer<vtkSomething> foo;
foo.TakeReference( vtkSomething::New() );

When TakeReference run:
1) vtkSomething::New() - reference number grow (1)
2) TakeReference call: vtkSmartPointer<T>(t, NoReference()); - constructor, no reference count growing (1)
3) TakeReference call: vtkSmartPointerBase::operator=(CheckType(r.GetPointer())); - reference number grow (2)

when I leave the block UnRegister(NULL) called just once -> this instance of vtkSomething object has left in memory.

I debugged the following code, too (Is it a correct use case?):
vtkSmartPointer<vtkSomething> foo;
foo = vtkSmartPointer<vtkSomething>::New() );

1) vtkSmartPointer<T>(T::New(), NoReference()); - reference count grow (1)
2) vtkSmartPointerBase::operator=(CheckType(r.GetPointer())); - reference number grow (2)

when I leave the block UnRegister(NULL) called just once -> this instance of vtkSomething object has left in memory.

Platform: Linux, 
CPU: G5 PowerPC
GCC: 4.3.2

Best regards,

Ferenc Nasztanovics

________________________________________
Feladó: vtk-developers-bounces at vtk.org [vtk-developers-bounces at vtk.org], meghatalmazó: Nasztanovics Ferenc [naszta at naszta.hu]
Küldve: 2010. június 23. 12:12
Címzett: vtk-developers at vtk.org
Tárgy: [vtk-developers] Memory leak in vtkSmartPointer

Hi,

In vtkSmartPointer we have the following code:

static T* CheckType(T* t) { return t; }
template <class U>
vtkSmartPointer& operator=(const vtkSmartPointer<U>& r)
  {
  this->vtkSmartPointerBase::operator=(CheckType(r.GetPointer()));
  return *this;
  }

void TakeReference(T* t)
  {
  *this = vtkSmartPointer<T>(t, NoReference());
  }

------------------

In my code I use

vtkSmartPointer<vtkSomething> foo;
foo.TakeReference( vtkSomething::New() );

the reference count is 2. I tried the following code, too:

vtkSmartPointer<vtkSomething> foo;
foo = vtkSmartPointer<vtkSomething>::New() );

but the reference number is still 2.

Best regards,

Ferenc Nasztanovics
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