[maccard]

Nope, just set the pointer back to where it started from. You do need to be super careful doing this though, as anything that relies on RAII (in c++ land) will be busted. You could manually call the destructor on the object in that case, but kind of defeats the purpose of the "no allocation" goals

[geezerjay]

C++ includes it's "placement new" feature specifically to cater to the memory pool needs. There's no allocation, and only constructor and destructor calls.