Singleton.h

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#ifndef WIRECELL_SINGLETON
#define WIRECELL_SINGLETON

namespace WireCell {

    template <class T>
    class Singleton
    {
    public:
        static T& Instance() {
            static T instance;
            return instance;
        }

    private:
        Singleton(){}
        ~Singleton(){}
        Singleton(Singleton const&){}
        Singleton& operator=(Singleton const&){}
    };
}

#endif