montepy._singleton.SingletonGroup

class montepy._singleton.SingletonGroup(*args, **kwargs)

Bases: ABC

A base class for implementing a Singleton-like data structure.

This treats immutable objects are Enums without having to list all. This is used for: Element, Nucleus, Library. When a brand new instance is requested it is created, cached and returned. If an existing instance is requested it is returned. This is done to reduce the memory usage for these objects.