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- // This may look like C code, but it is really -*- C++ -*-
- /*
- Copyright (C) 1988 Free Software Foundation
- written by Doug Lea (dl@rocky.oswego.edu)
-
- This file is part of the GNU C++ Library. This library is free
- software; you can redistribute it and/or modify it under the terms of
- the GNU Library General Public License as published by the Free
- Software Foundation; either version 2 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 Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free Software
- Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-
- #ifndef _DLList_h
- #ifdef __GNUG__
- //#pragma interface
- #endif
- #define _DLList_h 1
-
- #include <xpix.h>
-
- struct BaseDLNode {
- BaseDLNode *bk;
- BaseDLNode *fd;
- void *item() {return (void*)(this+1);} //Return ((DLNode<T>*)this)->hd
- };
-
- template<class T>
- class DLNode : public BaseDLNode
- {
- public:
- T hd;
- DLNode() { }
- DLNode(const T& h, DLNode* p = 0, DLNode* n = 0)
- : hd(h) { bk = p; fd = n; }
- ~DLNode() { }
- };
-
- class BaseDLList {
- protected:
- BaseDLNode *h;
-
- BaseDLList() { h = 0; }
- void copy(const BaseDLList&);
- BaseDLList& operator= (const BaseDLList& a);
- virtual void delete_node(BaseDLNode*node) = 0;
- virtual BaseDLNode* copy_node(void* datum) = 0;
- virtual void copy_item(void *dst, void *src) = 0;
- virtual ~BaseDLList() { }
-
- Pix prepend(void*);
- Pix append(void*);
- Pix ins_after(Pix p, void *datum);
- Pix ins_before(Pix p, void *datum);
- void remove_front(void *dst);
- void remove_rear(void *dst);
- void join(BaseDLList&);
-
- public:
- int empty() { return h == 0; }
- size_t length();
- void clear();
- void error(const char* msg);
- int owns(Pix p);
- int OK();
- void del(Pix& p, int dir = 1);
- void del_after(Pix& p);
- void del_front();
- void del_rear();
- };
-
- template <class T>
- class DLList : public BaseDLList {
- //friend class <T>DLListTrav;
-
- virtual void delete_node(BaseDLNode *node) { delete (DLNode<T>*)node; }
- virtual BaseDLNode* copy_node(void *datum)
- { return new DLNode<T>(*(T*)datum); }
- virtual void copy_item(void *dst, void *src) { *(T*)dst = *(T*)src; }
-
- public:
- DLList() : BaseDLList() { }
- DLList(const DLList<T>& a) : BaseDLList() { copy(a); }
-
- DLList<T>& operator = (const DLList<T>& a)
- { BaseDLList::operator=((const BaseDLList&) a); return *this; }
- virtual ~DLList() { clear(); }
-
- Pix prepend(T& item) {return BaseDLList::prepend(&item);}
- Pix append(T& item) {return BaseDLList::append(&item);}
-
- void join(DLList<T>& a) { BaseDLList::join(a); }
-
- T& front() {
- if (h == 0) error("front: empty list");
- return ((DLNode<T>*)h)->hd; }
- T& rear() {
- if (h == 0) error("rear: empty list");
- return ((DLNode<T>*)h->bk)->hd;
- }
- T remove_front() { T dst; BaseDLList::remove_front(&dst); return dst; }
- T remove_rear() { T dst; BaseDLList::remove_rear(&dst); return dst; }
-
- T& operator () (Pix p) {
- if (p == 0) error("null Pix");
- return ((DLNode<T>*)p)->hd;
- }
- Pix first() { return Pix(h); }
- Pix last() { return (h == 0)? 0 : Pix(h->bk); }
- void next(Pix& p)
- { p = (p == 0 || p == h->bk)? 0 : Pix(((DLNode<T>*)p)->fd); }
- void prev(Pix& p)
- { p = (p == 0 || p == h)? 0 : Pix(((DLNode<T>*)p)->bk); }
- Pix ins_after(Pix p, T& item) {return BaseDLList::ins_after(p, &item); }
- Pix ins_before(Pix p, T& item) {return BaseDLList::ins_before(p, &item);}
- };
-
- #endif
-