/usr/lib/grass74/include/grass/qtree.h is in grass-dev 7.4.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* \file qtree.c
*
* \author
* H. Mitasova, I. Kosinovsky, D. Gerdes, Fall 1993,
* University of Illinois and
* US Army Construction Engineering Research Lab
*
* \author H. Mitasova (University of Illinois),
* \author I. Kosinovsky, (USA-CERL)
* \author D.Gerdes (USA-CERL)
*
* \author updated/checked by Mitasova Nov. 96 (no changes necessary)
*
* \copyright
* (C) 1993-1996 by Helena Mitasova and the GRASS Development Team
*
* \copyright
* This program is free software under the
* GNU General Public License (>=v2).
* Read the file COPYING that comes with GRASS for details.
*/
#ifndef TREE_H
#define TREE_H
#define VOID_T char
/*!
* Function table for a tree
*
* From object oriented point of view, this structure represents
* a class or a virtual table of functions/methods for a class.
*/
struct multfunc
{
int (*compare) ();
struct quaddata **(*divide_data) ();
int (*add_data) ();
int (*intersect) ();
int (*division_check) ();
int (*get_points) ();
};
struct tree_info
{
struct multfunc *functions;
double dmin;
int kmax;
struct multtree *root;
};
struct multtree
{
struct quaddata *data;
struct multtree **leafs;
struct multtree *parent;
int multant;
};
struct multfunc *MT_functions_new(int (*)(struct triple *, struct quaddata *),
struct quaddata **(*)(struct quaddata *,
int, double),
int (*)(struct triple *, struct quaddata *,
double), int (*)(struct quaddata *,
struct quaddata *),
int (*)(struct quaddata *, int),
int (*)(struct quaddata *,
struct quaddata *, int));
struct tree_info *MT_tree_info_new(struct multtree *, struct multfunc *,
double, int);
struct multtree *MT_tree_new(struct quaddata *, struct multtree **,
struct multtree *, int);
int MT_insert(struct triple *, struct tree_info *, struct multtree *, int);
int MT_divide(struct tree_info *, struct multtree *, int);
int MT_region_data(struct tree_info *, struct multtree *, struct quaddata *,
int, int);
#endif
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