Just to have given my 2 cents: often beginners tend to see and code
singleton classes everywhere, however in most cases this is not
necessary or even too restricting for future extensions in the
architecture. Personally I try to avoid Singletons whenever possible,
in my opinion it should not be used and is a code-smell in itself.

Cheers,
Lukas

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Lukas Renggli
http://www.lukas-renggli.ch