Memory leaks

Some online documents say you should:

• Always call the destroy_bitmap function
• For every memory bitmap that you create
• To avoid memory leaks.

I have long believed (perhaps erroneously)

• That all of the memory used by a program
• Is returned to the operating system when the program terminates.

If so, the call to destroy_bitmap in Listing 5 is overkill:

• Because the call is made immediately before the program terminates.

I decided to err on the side of caution and make the call to destroy_bitmap anyway.