checking for null

[fullmetalcoder]

This may be a ridiculous question. And it may be just a C++ question. But I am totally lost here.

I would think that if I have declared an object, say a QListView, in a header file, but have not yet initialized that object, I could test for that declared but not initialized state with

if(sequenceList == NULL)

if(sequenceList == NULL)

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where sequenceList is the name of my QListView. But it is always returning false, whether initialized or not. I've also tried:

if(sequenceList == null)

if(sequenceList == null)

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and

if(sequenceList == 0)

if(sequenceList == 0)

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What am I doing wrong here? Any help would be greatly appreciated.

Thanks,
Derek

Depends on your compiler but pointers are rarely set to 0. You've got to do it in the constructor:

SomeClass::SomeClass(...)
 : sequenceList(0)
{
  //other stuff
}

SomeClass::SomeClass(...)
 : sequenceList(0)
{
  //other stuff
}

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which is the same as :

SomeClass::SomeClass(...)
{
  sequenceList = 0;
  //other stuff
}

SomeClass::SomeClass(...)
{
  sequenceList = 0;
  //other stuff
}

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