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c++pointersdelete-operator

free the memory of: A** mat = new A*[2];

I defined:

A** mat = new A*[2];

but how can I delete it? With delete[] mat; or delete[] *mat;?

Solution

  • It's delete[] mat; only when you do not do additional allocations. However, if you allocated the arrays inside the array of arrays, you need to delete them as well:

    A** mat = new A*[2];
for (int i = 0 ; i != 2 ; i++) {
    mat[i] = new A[5*(i+3)];
}
...
for (int i = 0 ; i != 2 ; i++) {
    delete[] mat[i];
}
delete[] mat;