singleton.h

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#ifndef _TEMPLATES__SINGLETON_H_
#define _TEMPLATES__SINGLETON_H_

namespace Templates
{
        template <class T>
        class Singleton;
}

template <class T>
class Templates::Singleton
{
        private:

                // Disable both constructors, destructor and assignment operator
                Singleton();
                ~Singleton();
                Singleton(const Singleton &);
                Singleton & operator=(const Singleton &);

        public:

                static T & instance()
                {
                        // This variant of returning static variable has a big advantage -
                        // you don't have to care about destruction of the holding object
                        // (if it was using dynamic allocation or it was declared static
                        // as a private variable).
                        // Sometimes it's called "Meyer's singleton", according to the author.
                        static T instance;
                        return instance;
                }
};

#endif