Question

I have an issue regarding freeing memory as under:

            string points; // some points sequences

    char* charPoints = (char*)malloc((points.length() +1) * sizeof(char));

            //do something

    free(charPoints);

Even then after freeing memory is leaked when checked with instruments

Answer 1

The pointer you pass to free must be the same one which returned by malloc. If you pass a different pointer it will result in a undefined behavior. Take a copy of the pointer before you do the operation such as incrementing the charPoints and then pass this original pointer to free function to properly release memory.