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#pragma once
namespace crepe {
class System {
public:
static System & get_instance();
virtual void update() = 0;
protected:
System() {};
virtual ~System() {};
private:
// singleton
System(const System &) = delete;
System(System &&) = delete;
System & operator=(const System &) = delete;
System & operator=(System &&) = delete;
};
} // namespace crepe
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