This is related to: What is so bad about Singletons
Can you give me some examples where Singletons can be avoided using other techniques? I need to use this in C++ so you can give examples with C++ specific techniques.
To be more clear: How you would implement a file manager, resource manager, log manager, etc without singletons.
How you would implement a file manager, resource manager, log manager, etc without singletons.
By not making them singletons and passing them down the call-tree and object-nets as parameters and references instead.
As a general rule: If you only need n instances, then create just n instances.
Or: If two instances of a well-designed class do not clash without breaking the class' contract, do not make it a singleton.