-/* PSPP - computes sample statistics.
- Copyright (C) 2007 Free Software Foundation, Inc.
+/* PSPP - a program for statistical analysis.
+ Copyright (C) 2007, 2009, 2011 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
- This program 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
- General Public License for more details.
+ This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef LIBPSPP_ABT_H
#define LIBPSPP_ABT_H 1
The ABT data structure partially abstracts augmentation. The
client passes in a "reaugmentation" function that accepts a
- node and its left and right children. This function must
- recalculate the node's augmentation data based on its own
- contents and the contents of its children, and store the new
- augmentation data in the node.
+ node. This function must recalculate the node's augmentation
+ data based on its own contents and the contents of its
+ children, and store the new augmentation data in the node.
The ABT automatically calls the reaugmentation function
whenever it can tell that a node's augmentation data might
}
// Recalculates the count for NODE's subtree by adding up the
- // counts for its LEFT and RIGHT child subtrees.
+ // counts for its left and right child subtrees.
static void
- reaugment_elements (struct abt_node *node_,
- const struct abt_node *left,
- const struct abt_node *right,
- const void *aux)
+ reaugment_elements (struct abt_node *node_, const void *aux)
{
struct element *node = node_to_element (node_);
node->count = 1;
- if (left != NULL)
- node->count += node_to_element (left)->count;
- if (right != NULL)
- node->count += node_to_element (right)->count;
+ if (node->node.down[0] != NULL)
+ node->count += node_to_element (node->node.down[0])->count;
+ if (node->node.down[1] != NULL)
+ node->count += node_to_element (node->node.down[1])->count;
}
// Finds and returns the element in ABT that is in the given
code and links to other resources, such as the original AA
tree paper. */
+#include <stdbool.h>
#include <stddef.h>
+#include "libpspp/cast.h"
/* Returns the data structure corresponding to the given NODE,
assuming that NODE is embedded as the given MEMBER name in
data type STRUCT. */
-#define abt_data(NODE, STRUCT, MEMBER) \
- ((STRUCT *) ((char *) (NODE) - offsetof (STRUCT, MEMBER)))
+#define abt_data(NODE, STRUCT, MEMBER) \
+ (CHECK_POINTER_HAS_TYPE (NODE, struct abt_node *), \
+ UP_CAST (NODE, STRUCT, MEMBER))
/* Node in an augmented binary tree. */
struct abt_node
const struct abt_node *b,
const void *aux);
-/* Recalculates NODE's augmentation based on NODE's data and that
- of its LEFT and RIGHT children, with the tree's AUX. */
-typedef void abt_reaugment_func (struct abt_node *node,
- const struct abt_node *left,
- const struct abt_node *right,
- const void *aux);
+/* Recalculates NODE's augmentation based on NODE's data and that of its left
+ and right children NODE->down[0] and NODE[1], respectively, with the tree's
+ AUX. */
+typedef void abt_reaugment_func (struct abt_node *node, const void *aux);
/* An augmented binary tree. */
struct abt
void abt_init (struct abt *, abt_compare_func *, abt_reaugment_func *,
const void *aux);
+static inline bool abt_is_empty (const struct abt *);
+
struct abt_node *abt_insert (struct abt *, struct abt_node *);
void abt_insert_after (struct abt *,
const struct abt_node *, struct abt_node *);
struct abt_node *abt_changed (struct abt *, struct abt_node *);
void abt_moved (struct abt *, struct abt_node *);
+/* Returns true if ABT contains no nodes, false if ABT contains at least one
+ node. */
+static inline bool
+abt_is_empty (const struct abt *abt)
+{
+ return abt->root == NULL;
+}
+
#endif /* libpspp/abt.h */