how to double an array size?

This is a discussion on how to double an array size? within the C++ Programming forums, part of the General Programming Boards category; well they are both array and yes they both are set to point to something. i had badwords point to ...

  1. #61
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    well they are both array and yes they both are set to point to something. i had badwords point to a class of badwords which consist of two strings and then i have sentence point to an array of words that make up a sentence.

  2. #62
    and the Hat of Guessing tabstop's Avatar
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    Then one or the other (or, I suppose, both) is already delete[]d when you get to the destructor. You wrote the code, so presumably you know which.

  3. #63
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    hmm i believe its badwords because when i // it doesnt give me the double free error but i dont see where i deallocate it

  4. #64
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    I am aware that past performance is no guarantee of future growth, but: perhaps you deallocate another pointer that you have set equal to badwords?

  5. #65
    Cat without Hat CornedBee's Avatar
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    What do you mean, you use the destructor? Do you call it explicitly? You're not supposed to do that.
    All the buzzt!
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  6. #66
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    If you use a safe delete function, then you won't get the delete error.

    possibly
    Code:
    void DeletePtr(void* ptr)
    {
       delete ptr;
       ptr = 0;
    }
    
    void DeletePtrA(void* ptr)
    {
       delete []ptr;
       ptr = 0;
    }

  7. #67
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    Quote Originally Posted by Raigne View Post
    If you use a safe delete function, then you won't get the delete error.

    possibly
    Code:
    void DeletePtr(void* &ptr)
    {
       delete ptr;
       ptr = 0;
    }
    
    void DeletePtrA(void* &ptr)
    {
       delete []ptr;
       ptr = 0;
    }
    Perhaps?

  8. #68
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    why a reference?

  9. #69
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    Maybe I am the confused one at this point. What purpose does your function actually serve?

  10. #70
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    well im done with this whole thing thanks for all the help you guys i got it working 100% no problems or anything thanks i learned a lot too.

  11. #71
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    Why a reference? If you want to change the parameter that gets passed in, how else would you do it?

  12. #72
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    The best I can figure, perhaps he is of the .NET school of thought wherein things are reference counted and its a crap shoot knowing whether or not they still exist in memory until you zero them. But even at that... *shrug* who cares.

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    no, I never use pointer references in my code, and everything works out fine.
    those are the functions I use to free memory. I don't know, but through the debugger this works fine. Stepping through the code produces no incorrect behavior.

  14. #74
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    Quote Originally Posted by Raigne View Post
    no, I never use pointer references in my code, and everything works out fine.
    those are the functions I use to free memory. I don't know, but through the debugger this works fine. Stepping through the code produces no incorrect behavior.
    And are the pointers equal to 0 afterwards?

  15. #75
    Algorithm Dissector iMalc's Avatar
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    Quote Originally Posted by Raigne View Post
    no, I never use pointer references in my code, and everything works out fine.
    those are the functions I use to free memory. I don't know, but through the debugger this works fine. Stepping through the code produces no incorrect behavior.
    Okay well I'll say this once: If you use the function you posted then the variables passed in will NOT be set to null.
    My homepage
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