autoptr.hxx

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/*
 *   xyzzy
 *   Copyright (C) 2007    Karl W. Pfalzer
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation; either version 2
 *   of the License, or (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the
 *   Free Software Foundation, Inc.
 *   51 Franklin Street, Fifth Floor
 *   Boston, MA  02110-1301, USA.
 */

#if !defined(_xyzzy_autoptr_hxx_)
#    define  _xyzzy_autoptr_hxx_

namespace xyzzy
{
    template<class T>
    class PTAutoPtr
    {
    public:
        explicit PTAutoPtr(T* p, bool owns = true)
        :   m_p(p), m_owns(owns)
        {}

        PTAutoPtr(const PTAutoPtr<T> &r)
        {
            init(r);
        }

        const PTAutoPtr& operator=(const PTAutoPtr &r)
        {
            destroy();
            init(r);
            return *this;
        }

        T* get() const
        {
            return m_p;
        }

        T* operator->()
        {
            return get();
        }

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

        ~PTAutoPtr()
        {
            destroy();
        }

    private:
        void init(const PTAutoPtr &r)
        {
            m_p = r.m_p;
            m_owns = r.m_owns;
            PTAutoPtr &rr = const_cast<PTAutoPtr&>(r);
            rr.m_owns = false;
            rr.m_p = 0;
        }

        void destroy()
        {
            if (m_owns)
            {
                delete m_p;
                m_p = 0;
                m_owns = false;
            }
        }

        T       *m_p;
        bool    m_owns;
    };
};

#endif  //_xyzzy_autoptr_hxx_

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