class TMapRec

TMapFile

This class implements a shared memory region mapped to a file.
Objects can be placed into this shared memory area using the Add()
member function. Whenever the mapped object(s) change(s) call
Update() to put a fresh copy in the shared memory. This extra
step is necessary since it is not possible to share objects with
virtual pointers between processes (the vtbl ptr points to the
originators unique address space and can not be used by the
consumer process(es)). Consumer processes can map the memory region
from this file and access the objects stored in it via the Get()
method (which returns a copy of the object stored in the shared
memory with correct vtbl ptr set). Only objects of classes with a
Streamer() member function defined can be shared.