Best way to allocate large memory

[razzle]

Sorry, but that's horrible advice. (even just on it's own).
cleanup what you create. period. There is no good excuse for anything else.

Do you clean up before smart pointers do their job?

Probably not and in the same way there's no particular reason to clean up before the system does its job when a program terminates.

But you must know the rules of course and maybe one cannot expect that from most programmers. So since this is no big deal for me I clean up my post.