smart_ptr.h

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#ifndef _RE2C_UTIL_SMART_PTR_
#define _RE2C_UTIL_SMART_PTR_

namespace re2c 
{

    template <class T>
    class smart_ptr 
    {
    private:
        T* ptr;
        long* count;   // shared number of owners

    public:
        explicit smart_ptr (T* p=0)
            : ptr(p), count(new long(1)) {}

        smart_ptr (const smart_ptr<T>& p) throw()
            : ptr(p.ptr), count(p.count) 
        {
            ++*count;
        }

        ~smart_ptr ()
        {
            dispose();
        }

        smart_ptr<T>& operator= (const smart_ptr<T>& p)
        {
            if (this != &p) 
            {
                    dispose();
                    ptr = p.ptr;
                    count = p.count;
                    ++*count;
            }
            return *this;
        }

        T& operator*() const
        {
            return *ptr;
        }

        T* operator->() const
        {
            return ptr;
        }

    private:
        void dispose()
        {
            if (--*count == 0) 
            {
                    delete count;
                    delete ptr;
            }
        }
    };

    template <typename T>
    smart_ptr<T> make_smart_ptr(T* p)
    {
        return smart_ptr<T>(p);
    }
}

#endif // _RE2C_UTIL_SMART_PTR_