61d5ffaf10
issues in these areas:
.h's installed
.hP's installed
-lcurses interaction
files needed in ~/legal for copyleft reasons.
127 lines
4.1 KiB
C++
127 lines
4.1 KiB
C++
// This may look like C code, but it is really -*- C++ -*-
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/*
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Copyright (C) 1988 Free Software Foundation
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written by Doug Lea (dl@rocky.oswego.edu)
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This file is part of the GNU C++ Library. This library is free
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software; you can redistribute it and/or modify it under the terms of
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the GNU Library General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your
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option) any later version. This library is distributed in the hope
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that it will be useful, but WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the GNU Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free Software
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Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _DLList_h
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#ifdef __GNUG__
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//#pragma interface
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#endif
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#define _DLList_h 1
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#include <Pix.h>
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struct BaseDLNode {
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BaseDLNode *bk;
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BaseDLNode *fd;
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void *item() {return (void*)(this+1);} //Return ((DLNode<T>*)this)->hd
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};
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template<class T>
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class DLNode : public BaseDLNode
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{
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public:
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T hd;
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DLNode() { }
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DLNode(const T& h, DLNode* p = 0, DLNode* n = 0)
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: hd(h) { bk = p; fd = n; }
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~DLNode() { }
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};
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class BaseDLList {
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protected:
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BaseDLNode *h;
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BaseDLList() { h = 0; }
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void copy(const BaseDLList&);
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BaseDLList& operator= (const BaseDLList& a);
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virtual void delete_node(BaseDLNode*node) = 0;
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virtual BaseDLNode* copy_node(const void* datum) = 0;
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virtual void copy_item(void *dst, void *src) = 0;
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virtual ~BaseDLList() { }
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Pix prepend(const void*);
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Pix append(const void*);
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Pix ins_after(Pix p, const void *datum);
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Pix ins_before(Pix p, const void *datum);
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void remove_front(void *dst);
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void remove_rear(void *dst);
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void join(BaseDLList&);
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public:
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int empty() const { return h == 0; }
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int length() const;
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void clear();
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void error(const char* msg);
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int owns(Pix p);
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int OK();
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void del(Pix& p, int dir = 1);
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void del_after(Pix& p);
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void del_front();
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void del_rear();
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};
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template <class T>
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class DLList : public BaseDLList {
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//friend class <T>DLListTrav;
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virtual void delete_node(BaseDLNode *node) { delete (DLNode<T>*)node; }
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virtual BaseDLNode* copy_node(const void *datum)
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{ return new DLNode<T>(*(const T*)datum); }
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virtual void copy_item(void *dst, void *src) { *(T*)dst = *(T*)src; }
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public:
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DLList() : BaseDLList() { }
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DLList(const DLList<T>& a) : BaseDLList() { copy(a); }
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DLList<T>& operator = (const DLList<T>& a)
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{ BaseDLList::operator=((const BaseDLList&) a); return *this; }
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virtual ~DLList() { clear(); }
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Pix prepend(const T& item) {return BaseDLList::prepend(&item);}
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Pix append(const T& item) {return BaseDLList::append(&item);}
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void join(DLList<T>& a) { BaseDLList::join(a); }
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T& front() {
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if (h == 0) error("front: empty list");
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return ((DLNode<T>*)h)->hd; }
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T& rear() {
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if (h == 0) error("rear: empty list");
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return ((DLNode<T>*)h->bk)->hd;
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}
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T remove_front() { T dst; BaseDLList::remove_front(&dst); return dst; }
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T remove_rear() { T dst; BaseDLList::remove_rear(&dst); return dst; }
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T& operator () (Pix p) {
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if (p == 0) error("null Pix");
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return ((DLNode<T>*)p)->hd;
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}
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Pix first() { return Pix(h); }
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Pix last() { return (h == 0)? 0 : Pix(h->bk); }
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void next(Pix& p)
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{ p = (p == 0 || p == h->bk)? 0 : Pix(((DLNode<T>*)p)->fd); }
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void prev(Pix& p)
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{ p = (p == 0 || p == h)? 0 : Pix(((DLNode<T>*)p)->bk); }
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Pix ins_after(Pix p, const T& item)
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{return BaseDLList::ins_after(p, &item); }
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Pix ins_before(Pix p, const T& item)
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{return BaseDLList::ins_before(p, &item);}
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};
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#endif
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