What is AllocatorBase class for?

[Voronkov Konstantin]

Hello, All!   I have a question about AllocatorBase, AllocatorWithCleanup, ... classes.  In the header of secblock.h I see comment: >  secure memory allocation What is secure here? Do you mean memory block which can not  be writed to cache or which can be accessed from application? Why this classes are needed? There is declared AllocatorBase::construct() but never used?  At least I did not found how it is used. What that is for?   Can you provide a link about how to use  those classes and their purposes, please?   Thanks in advance, Voronkov Konstantin