Array of Pointers + Deleting An Object = Problems

This is a discussion on Array of Pointers + Deleting An Object = Problems within the C++ Programming forums, part of the General Programming Boards category; Hi there, I have an array of pointers to objects, and I wish to delete an object pointed to by ...

  1. #1
    Registered User
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    Feb 2004
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    Array of Pointers + Deleting An Object = Problems

    Hi there,

    I have an array of pointers to objects, and I wish to delete an object pointed to by one of the elements. However, when I try to do this using delete MyPtrArray[2]; my program crashes at runtime. The object pointed to by MyPtrArray[2] definitely exists, as I can access the object's data via the pointer. Am I using delete incorrectly here?

    Thanks!

  2. #2
    Registered User jlou's Avatar
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    The code below works fine, so you'll have to show more of your code to see what you are doing wrong.
    Code:
    int main()
    {
        const int arraySize = 5;
    
        int* MyPtrArray[arraySize];
        for (int i=0; i < arraySize; i++)
            MyPtrArray[i] = new int(i);
    
        delete MyPtrArray[2];
    
        MyPtrArray[2] = 0; // Set to null after delete.
        for (int j=0; j < arraySize; j++)
            delete MyPtrArray[j];
    }
    By the way, do you know when your program crashes at run time? Is it after or during the delete. If it is after, it is quite possible that you are trying to use the pointer that you deleted after you delete it.
    Last edited by jlou; 03-04-2004 at 09:48 AM.

  3. #3
    Registered User Codeplug's Avatar
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    Or perhaps the object's desctructor is causing the problem......
    Use your debugger to pinpoint where the crash is occuring for more clues.

    gg

  4. #4
    Registered User
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    Feb 2004
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    Thanks CodePlug, you were exactly right, it was a problem in the destructor. I guess I should've checked there first...

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