wxObjArray and pointers to elements

[Blinkinhek]

I have several wxObjArrays in my code. I also use pointers to Items in the arrays (ie &array.Item(index) ). If I Remove an element (ie array.RemoveAt(index) ), do the pointers to the remaining elements stay the same?

Sample code for a simple wxObjArray indicates yes, but I do not know if this is accidental, or by design.

I would like to assume that a sensible array would 'simply' unlink+delete the element to be removed, so retaining the memory addresses of the other elements.

[coderrc]

If I understand correctly, you are doing something like

Code: Select all

wxArray<T> objs;
T obj;
objs.AddAt(obj,0);

T* objptr=&objs[0];

in which case the answer is, no. absolutely not.

wxArrays are dynamic, meaning they will resize themselves when needed. "resize" may be a bit misleading. what it really does is alocate a new block of memory, copy itself into that new memory, then free the old memory. Thus after a resize, all pointers to elements in the array will be invalid, even if they still "work" that region of memory can be reallocated by the OS at anytime.

[ONEEYEMAN]

Hi,
In addition:

If you remove an element from such an array the memory will still be allocated because the pointer is not yet been deleted.
If you don't need it - delete the pointer instead of removing the object from the array.

Thank you.