The source code provided here implements a C++ evictor base class. To
use it, you must derive a class from EvictorBase and implement the
pure virtual add() and evict() methods.

add() is called when the evictor needs to instantiate a servant, and
evict() is called when the evictor has decided to evict a servant.
Note that you can pass information from add() to the corresponding
call to evict() via the cookie argument.

For more details on this evictor, see the section "Server
Implementation Techniques" in the Ice documentation.
