I can see the argument against using Singletons just as global variables.
But in many circumstances they are useful. The most obvious two situations I use them are in:
- Log objects.
- Database handles.
Passing a database handle to all methods, or to multiple objects gets sloppy fast - but having a single resource to fetch it from is neat.
Similarly with debug files; although they are sometimes abused when you realise you need more than one logfile...
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