class error

[zachtastic]

im getting this funny error ive never seen before. the class is taking objects in an array from another class and storing them in a sub array specificed by the user ..... any thing will help

thnanks

// main menu call to class
   sublist[100] = aList.sublist(start, finish, success);


List List::sublist(int fromIndex, int upToIndex, bool& success)
{
    List subList;
    
    int counter = 1;
    for (int i = fromIndex - 1; i < upToIndex; i++)
    {
        subList.insert(counter, items[i], success);
        counter ++;
        cout << "adding...";

    }
    cout << "after";
    return subList;
}

 2 [main] listlab 2872 _cygtls::handle_exceptions: Exception: STATUS_ACCESS_VIOLATION
   3780 [main] listlab 2872 open_stackdumpfile: Dumping stack trace to listlab.exe.stackdump
adding...adding...adding...adding...after
RUN FAILED (exit value 35,584, total time: 11s)

[Disch]

I'd guess memory corruption.

Hard to spot the error with just the code you posted... but here are some thoughts:


line 2) does 'sublist' have at least 101 elements? Is [100] a valid index? or is that out of bounds?

lines 10, 12) you're doing items[i], but i will start at fromindex-1. So if you make a sublist fromIndex 0, you're actually accessing index [-1] (bad!). Why are you subtracting 1 there?

[zachtastic]

sublist has no more then 8 elements so i know there are enough memory spaces, and as for the -1 i dont know i got rid of it and get the same error ....

the problem is when it trys to return the list because the cout statemets make it through the loop but do not make it out of the method

[Disch]

so...

sublist[100] = aList.sublist(start, finish, success);

Notice sublist[100] (ie, you're copying to the 101st element of the sublist array)

but

sublist has no more then 8 elements

See the problem? You're stepping out of bounds in your array.

Can you show me how sublist is declared? That would help.

[zachtastic]

THANK YOU ...... ya i dont know why i had my sublist as an array .... the list class has an array private variable i was supposed to be using ... that fixed everything thank you