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fac0307756
Introduce a new macro "container_of" to convert a member point to a point to the containing struct with relative type saftey. Stolen from Linux. I'd rather this was in a different header to "qtypes.h", but that's the best place for it at the moment, without creating a new header. Replace the cvar_for_completion macro and add helper functions stree_entry and completion_entry to remove the rb_entry macro. This ends up looking a bit neater. Signed-off-by: Tyrann <tyrann@disenchant.net>
78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/*
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Red Black Trees
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(C) 1999 Andrea Arcangeli <andrea@suse.de>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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-----------------------------------------------------------------------
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To use rbtrees you'll have to implement your own insert and search cores.
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This will avoid us to use callbacks and to drop drammatically performances.
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I know it's not the cleaner way, but in C (not in C++) to get
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performances and genericity...
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Some example of insert and search follows here. The search is a plain
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normal search over an ordered tree. The insert instead must be implemented
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int two steps: as first thing the code must insert the element in
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order as a red leaf in the tree, then the support library function
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rb_insert_color() must be called. Such function will do the
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not trivial work to rebalance the rbtree if necessary.
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-----------------------------------------------------------------------
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*/
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#ifndef RB_TREE_H
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#define RB_TREE_H
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#include <stddef.h>
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struct rb_node {
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struct rb_node *rb_parent;
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int rb_color;
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#define RB_RED 0
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#define RB_BLACK 1
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struct rb_node *rb_right;
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struct rb_node *rb_left;
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};
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struct rb_root {
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struct rb_node *rb_node;
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};
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#define RB_ROOT (struct rb_root) { NULL, }
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/*
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*
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*/
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extern void rb_insert_color(struct rb_node *, struct rb_root *);
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/*
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*
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*/
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extern void rb_erase(struct rb_node *, struct rb_root *);
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static inline void
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rb_link_node(struct rb_node *node, struct rb_node *parent,
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struct rb_node **rb_link)
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{
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node->rb_parent = parent;
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node->rb_color = RB_RED;
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node->rb_left = node->rb_right = NULL;
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*rb_link = node;
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}
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#endif /* RB_TREE_H */
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