[boost] Singleton/Multiton Longevity

From: Jason Hise (chaos_at_[hidden])
Date: 2005-02-03 17:35:43

Just a status update on the singleton/multiton library, so that people 
know I am still alive ;).  After much chaos trying to write a multiton 
longevity lifetime policy, I had the sudden realization that both 
singletons and multitons should be able to play nicely together.  Thus, 
I am writing a single(ton) class to manage a priority queue of 
shared_ptrs to nodes.  The longevity policies will derive privately from 
their respective dependency policies, and create their own derived node 
types which hold dependencies.  As the inheritance is private, these 
will be the only dependencies in existence.  Both multitons and 
singletons will be destroyed as the dependency-holding nodes are popped 
in the destructor of the instance registry, which itself will have a 
static dependency to ensure existence for the entire lifetime of the 
program.

Thoughts and suggestions, as always, are welcome.

-Jason