Quick Question

This is a discussion on Quick Question within the C++ Programming forums, part of the General Programming Boards category; How do you delete a pointer to an array? --C++angel...

  1. #1
    Registered User
    Join Date
    Feb 2006

    Quick Question

    How do you delete a pointer to an array?


  2. #2
    Absent Minded Programmer
    Join Date
    May 2005

    EDIT: Sorry if I was vague

    anything you new with [] you have to delete with []..

    I'm pretty sure that is the general rule of thumb

    So if you have a pointer to an array..

    and with that pointer you could do this pptr[]

    you need to delete it like this

    delete[] pptr[];

    My syntax might be off, but the idea is there
    Last edited by Shamino; 03-09-2006 at 10:52 PM.
    Sometimes I forget what I am doing when I enter a room, actually, quite often.

  3. #3
    Guest Sebastiani's Avatar
    Join Date
    Aug 2001
    Waterloo, Texas
    just: delete [] pptr;

    also, there are two reasons why it is extremely important to that syntax with arrays and *not* to use them on a single object:

    1) most implementations hide a count of the array elements either in front of or at the end of the data bytes. using the above syntax on a single object could cause a runtime error since the library would be trying to access the count which would probably not be appended to a single object.

    2) using the above syntax instructs the library to invoke the destructor on each element in the array.
    #include <cmath>
    #include <complex>
    bool euler_flip(bool value)
        return std::pow
            std::complex<float>(0, 1) 
            * std::complex<float>(std::atan(1.0)
            *(1 << (value + 2)))
        ).real() < 0;

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