self_list.h

/*************************************************************************/
/*  self_list.h                                                          */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
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/* the following conditions:                                             */
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/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/*************************************************************************/
#ifndef SELF_LIST_H
#define SELF_LIST_H

#include "typedefs.h"

template<class T>
class SelfList {
public:



    class List {


        SelfList<T> *_first;
    public:
        void add(SelfList<T> *p_elem) {

            ERR_FAIL_COND(p_elem->_root);

            p_elem->_root=this;
            p_elem->_next=_first;
            p_elem->_prev=NULL;
            if (_first)
                _first->_prev=p_elem;
            _first=p_elem;
        }

        void remove(SelfList<T> *p_elem) {

            ERR_FAIL_COND(p_elem->_root!=this);
            if (p_elem->_next) {

                p_elem->_next->_prev=p_elem->_prev;
            }
            if (p_elem->_prev) {

                p_elem->_prev->_next=p_elem->_next;
            }

            if (_first==p_elem) {

                _first=p_elem->_next;
            }

            p_elem->_next=NULL;
            p_elem->_prev=NULL;
            p_elem->_root=NULL;
        }

        _FORCE_INLINE_ SelfList<T> *first() { return _first; }
        _FORCE_INLINE_ const SelfList<T> *first() const { return _first; }
        _FORCE_INLINE_ List() { _first=NULL; }
        _FORCE_INLINE_ ~List() { ERR_FAIL_COND(_first!=NULL); }

    };
private:
    List *_root;
    T *_self;
    SelfList<T> *_next;
    SelfList<T> *_prev;
public:

    _FORCE_INLINE_ bool in_list() const { return _root; }
    _FORCE_INLINE_ SelfList<T> *next() { return _next; }
    _FORCE_INLINE_ SelfList<T> *prev() { return _prev; }
    _FORCE_INLINE_ const SelfList<T> *next() const { return _next; }
    _FORCE_INLINE_ const SelfList<T> *prev() const { return _prev; }
    _FORCE_INLINE_ T*self() const { return _self; }


    _FORCE_INLINE_ SelfList(T *p_self) {

        _self=p_self;
        _next=NULL;
        _prev=NULL;
        _root=NULL;
    }

    _FORCE_INLINE_ ~SelfList() {

        if (_root)
            _root->remove(this);
    }

};

#endif // SELF_LIST_H