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auto_ptr.h

// Filename     : auto_ptr.h
// Purpose      : Simple auto_ptr implementation out of More Effective C++/Scott Myers.
// Author       : Erad Fridman
// Date         : 10/10/2001

#ifndef __AUTO_PTR_H__
#define __AUTO_PTR_H__

template<class X>
class auto_ptr {
        public:
                explicit auto_ptr(X *p = 0) : _data (p) {}

                template <class U>
                auto_ptr(auto_ptr<U> &rhs) : _data(rhs.release()) {}

                ~auto_ptr() { delete _data; }

                template<class U>
                auto_ptr<X>& operator=(auto_ptr<U> &rhs) {
                        if (this != &rhs) reset(rhs.release());
                        return *this;
                }

                X& operator*() const { return *_data; }

                X* operator->() const { return _data; }

                X* get() const { return _data; }

                X* release() {
                        X *old_data = _data;
                        _data = 0;
                        return old_data;
                }

                void reset(X *p = 0) {
                        if (_data != p) {
                                delete _data;
                                _data = p;
                        }
                }

        private:
                X *_data;
};

#endif // __AUTO_PTR_H__

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