This allocator is great for temporary memory, such as returning a pointer from a function, or storing a formatted string. The memory allocated using this allocator does not need to be freed. The idea is that as you keep allocating you will "wrap around" and start writing over memory that was allocated before. For this reason, it is not safe to use this for any kind of permanent allocation. Also, be wary that you provide this allocator with a buffer big enough to store as much data as you are going to need at any given time.