6 Copyright (C) 2004 Kern Sibbald and John Walker
8 This program is free software; you can redistribute it and/or
9 modify it under the terms of the GNU General Public License as
10 published by the Free Software Foundation; either version 2 of
11 the License, or (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public
19 License along with this program; if not, write to the Free
20 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
25 /* ========================================================================
27 * Doubly linked list -- dlist
35 /* In case you want to specifically specify the offset to the link */
36 #define OFFSET(item, link) ((char *)(link) - (char *)(item))
38 * There is a lot of extra casting here to work around the fact
39 * that some compilers (Sun and Visual C++) do not accept
40 * (void *) as an lvalue on the left side of an equal.
42 * Loop var through each member of list
44 #define foreach_dlist(var, list) \
45 for((var)=NULL; (*((void **)&(var))=(void*)((list)->next(var))); )
48 #define foreach_dlist(var, list) \
49 for((var)=NULL; (((void *)(var))=(list)->next(var)); )
58 class dlist : public SMARTALLOC {
64 dlist(void *item, dlink *link);
66 ~dlist() { destroy(); }
67 void init(void *item, dlink *link);
68 void prepend(void *item);
69 void append(void *item);
70 void insert_before(void *item, void *where);
71 void insert_after(void *item, void *where);
72 void *unique_binary_insert(void *item, int compare(void *item1, void *item2));
73 void binary_insert(void *item, int compare(void *item1, void *item2));
74 void remove(void *item);
77 void *next(const void *item) const;
78 void *prev(const void *item) const;
86 * This allows us to do explicit initialization,
87 * allowing us to mix C++ classes inside malloc'ed
88 * C structures. Define before called in constructor.
90 inline void dlist::init(void *item, dlink *link)
93 loffset = (char *)link - (char *)item;
94 if (loffset < 0 || loffset > 5000) {
95 Emsg0(M_ABORT, 0, "Improper dlist initialization.\n");
101 * Constructor called with the address of a
102 * member of the list (not the list head), and
103 * the address of the link within that member.
104 * If the link is at the beginning of the list member,
105 * then there is no need to specify the link address
106 * since the offset is zero.
108 inline dlist::dlist(void *item, dlink *link)
113 /* Constructor with link at head of item */
114 inline dlist::dlist(void) : head(0), tail(0), loffset(0), num_items(0)
118 inline bool dlist::empty() const
123 inline int dlist::size() const
130 inline void * dlist::first() const
135 inline void * dlist::last() const