Question

This might sound like a silly question, but I couldn’t find information on how to properly release memory in this case:

Assume there is a function returning a double* (there is no other information available about this function). Assume further the following use case:

for (int i = 0; i < SIZE; i++) {
    double *ptr = new double[3];

    /// do something with ptr, e.g., print

    // delete[] ptr;
}

How does one correctly release memory in this case, since a delete[] ptr; placed in the comment above causes a backtrace (why?)?

Many thanks!

Answer 1

Doing

double *ptr = new double[3];

delete[] ptr;

is quite right. So your problem must reside somewhere else. I can recommend using a debugger to check what’s going on, and if you’re on a linux system I would recommend trying valgrind/helgrind – it’s pretty nice