/*
    SLB - Simple Lua Binder
    Copyright (C) 2007 Jose L. Hidalgo Valiño (PpluX)

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

	Jose L. Hidalgo (www.pplux.com)
	pplux@pplux.com
*/

#ifndef __SLB_REF_PTR__
#define __SLB_REF_PTR__

namespace SLB {

	template<class T>
	class ref_ptr
	{
	public:
        typedef T element_type;

        ref_ptr() :_ptr(0L) {}
        ref_ptr(T* t):_ptr(t) { if (_ptr) _ptr->ref(); }
        ref_ptr(const ref_ptr& rp):_ptr(rp._ptr)  { if (_ptr) _ptr->ref(); }
        ~ref_ptr() { if (_ptr) _ptr->unref(); _ptr=0L; }

        inline ref_ptr& operator = (const ref_ptr& rp)
        {
            if (_ptr==rp._ptr) return *this;
            T* tmp_ptr = _ptr;
            _ptr = rp._ptr;
            if (_ptr) _ptr->ref();
            if (tmp_ptr) tmp_ptr->unref();
            return *this;
        }

        inline ref_ptr& operator = (T* ptr)
        {
            if (_ptr==ptr) return *this;
            T* tmp_ptr = _ptr;
            _ptr = ptr;
            if (_ptr) _ptr->ref();
            if (tmp_ptr) tmp_ptr->unref();
            return *this;
        }

        // comparison operators for ref_ptr.
        inline bool operator == (const ref_ptr& rp) const { return (_ptr==rp._ptr); }
        inline bool operator != (const ref_ptr& rp) const { return (_ptr!=rp._ptr); }
        inline bool operator < (const ref_ptr& rp) const { return (_ptr<rp._ptr); }
        inline bool operator > (const ref_ptr& rp) const { return (_ptr>rp._ptr); }

        // comparison operator for const T*.
        inline bool operator == (const T* ptr) const { return (_ptr==ptr); }
        inline bool operator != (const T* ptr) const { return (_ptr!=ptr); }
        inline bool operator < (const T* ptr) const { return (_ptr<ptr); }
        inline bool operator > (const T* ptr) const { return (_ptr>ptr); }

        inline T& operator*() { return *_ptr; }
        inline const T& operator*() const { return *_ptr; }
        inline T* operator->() { return _ptr; }
        inline const T* operator->() const { return _ptr; }
		inline bool operator!() const { return _ptr==0L; }
		inline bool valid() const { return _ptr!=0L; }
        inline T* get() { return _ptr; }
        inline const T* get() const { return _ptr; }
		inline T* release() { T* tmp=_ptr; if (_ptr) _ptr->unref_nodelete(); _ptr=0; return tmp;}

	private:
        T* _ptr;
	};

}


#endif