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Design patterns you should unlearn in Python
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Because C++ doesn’t have modules (before c++20) or proper package systems, Singleton was a clever hack to guarantee exactly one instance of a class, avoiding the nightmare of duplicate globals and multiple definitions. Managing this global state is tricky — and the Singleton pattern wraps this idea into a class that controls its own single instance, so you don’t have to worry about multiple definitions. So yes, Singleton is basically a band-aid for C++’s lack of modularity and clean global state management — not a holy grail of software design.
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