checking memory/pointer if it's valid before deleting

This is a discussion on checking memory/pointer if it's valid before deleting within the C++ Programming forums, part of the General Programming Boards category; I'm trying to find out a proper practice of checking if the pointer/array is valid before calling the delete operator. ...

  1. #1
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    checking memory/pointer if it's valid before deleting

    I'm trying to find out a proper practice of checking if the pointer/array is valid before calling the delete operator. I know I can check if the pointer is a NULL pointer before deciding whether I should call the delete operator, but that doesn't take care of the case of a dangling pointer. In other words, how do I check whether I have proper access to the memory that the pointer is pointing to before calling the delete operator?

    Thanks in advance for suggestions.

  2. #2
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    You can't check if the pointer is dangling. The best practice is to do:
    Code:
    delete my_pointer;
    my_pointer = NULL;
    It is OK to delete a NULL pointer, so you don't need to check if it's NULL before calling delete.

  3. #3
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    What happens if I would allocate my_pointer again right after delete? Would it get assigned to an address that has enough memory in the heap?

  4. #4
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    Yes.

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