Qt layout memory issue

[bunjee]

Thanks everybody,

Well well,
The problem was coming from my side :

this :

ZeTextWidget * textWidget = new ZeTextWidget("Salut");
      QHBoxLayout * layout = new QHBoxLayout();
      layout->addWidget(textWidget);
      delete layout;
      delete textWidget;

ZeTextWidget * textWidget = new ZeTextWidget("Salut");
      QHBoxLayout * layout = new QHBoxLayout();
      layout->addWidget(textWidget);
      delete layout;
      delete textWidget;

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and this :

ZeTextWidget textWidget("Salut");
      QHBoxLayout * layout = new QHBoxLayout();
      layout->addWidget(&textWidget);
      delete layout;

ZeTextWidget textWidget("Salut");
      QHBoxLayout * layout = new QHBoxLayout();
      layout->addWidget(&textWidget);
      delete layout;

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Perfectly works.
When deleted, a layout doesn't delete the assigned objects.

Concerning the setting the pointer to NULL :

As marcel said, this doesn't work :

void deletePtr(int* x)
      {
       delete x;
       x = NULL;.
      }
 
      int main(void)
      {
        int varAllocatedOnStack = 5;
        deletePtr(&varAllocatedOnStack);
      }

void deletePtr(int* x)
      {
       delete x;
       x = NULL;.
      }

      int main(void)
      {
        int varAllocatedOnStack = 5;
        deletePtr(&varAllocatedOnStack);
      }

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But I'm more doing something like that :

void deletePtr(int* x)
      {
       delete x;
      }
 
      int main(void)
      {
        int * newVar = new int(5);
 
       int * newPtr = newVar;
 
      (...)
 
       newPtr = NULL;.
 
        deletePtr(varAllocatedOnStack);
      }

void deletePtr(int* x)
      {
       delete x;
      }

      int main(void)
      {
        int * newVar = new int(5);

       int * newPtr = newVar;

      (...)

       newPtr = NULL;.

        deletePtr(varAllocatedOnStack);
      }

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As iw2nhl said setting a pointer to NULL is a valid code.
Setting a pointer to NULL is a way knowing if a pointer has been assigned to something or not.

And correct me if I'm wrong but the heap will never create a 0 pointer variable.
Setting a pointer to NULL is like saying : okay the adress of my pointer isn't valid anymore.

And I don't see why it would crash anything in my case, and it doesn't.