Question

If my code is the following, how can I use delete to ensure all dynamically allocated data is deleted safely?

float** test;
test = new float*[3];
for(int i=0;i<3;i++)
    test[i] = new float[2];

Answer 1

The golden rule – for each new/new[] you need delete/delete[]. So:

for(int i=0;i<3;i++)
    delete[] test[i];
delete[] test;

Same as with new/new[], but in reversed order.