Add singleton helper types

mishaturnbull / edgegraph

Python edge-vertex graph framework

https://edgegraph.readthedocs.io/en/latest/

GNU Lesser General Public License v3.0

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Closed mishaturnbull closed 5 months ago

mishaturnbull commented 5 months ago

Adds:

Metaclass for true singletons
Metaclass factory for semi-singletons
Utility functions for clearing both kinds of singletons, and checking semi-singleton instances (checking instances for a true singleton doesn't make sense, this wasn't an oversight).
Documentation & testing for all