How to delete a VLA

Asked Jun 05 '16 at 20:13

Active Jun 05 '16 at 20:13

Viewed 54 times

I declared a variable length array through new.

int N;
cin >> N;
int** seq = new int*[N];
for(int i=0;i<N;++i){
    int k;
    cin >> k;
    int* s = new int[k];
    for(int j=0;j<k;++j){
        cin >> s[j];
    }
    seq[i] = s;
}

What's the proper way to delete the array?

    delete[] seq;

Is it sufficient? Or I have to delete the subarrays one by one?

for(int i=0;i<N;++i){
    delete[] seq[i];
}
delete[] seq;

asked Jun 05 '16 at 20:13

Milo Lu

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7

That's not really a VLA, you are misusing that term here. – πάντα ῥεῖ Jun 05 '16 at 20:15
8

You must call `delete` for every call to `new`. – Cornstalks Jun 05 '16 at 20:15
and stop using arrays and raw pointers if you didn't benchmark against vector/unique_ptr/shared_ptr. Arrays are C. Raw pointers are C. Vectors/smart pointers = C++ – strangeqargo Jun 05 '16 at 20:16
You have to delete subarrays one by one. – Dmitry Poroh Jun 05 '16 at 20:18

How to delete a VLA

0 Answers0