/usr/include/gwyddion/app/undo.h is in libgwyddion20-dev 2.50-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* $Id: undo.h 20678 2017-12-18 18:26:55Z yeti-dn $
* Copyright (C) 2003-2006 David Necas (Yeti), Petr Klapetek.
* E-mail: yeti@gwyddion.net, klapetek@gwyddion.net.
*
* 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 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.
*/
#ifndef __GWY_APP_UNDO_H__
#define __GWY_APP_UNDO_H__
#include <libgwyddion/gwycontainer.h>
G_BEGIN_DECLS
gulong gwy_app_undo_checkpoint (GwyContainer *data,
...);
gulong gwy_app_undo_qcheckpoint (GwyContainer *data,
...);
gulong gwy_app_undo_checkpointv (GwyContainer *data,
guint n,
const gchar **keys);
gulong gwy_app_undo_qcheckpointv (GwyContainer *data,
guint n,
const GQuark *keys);
void gwy_app_undo_undo_container (GwyContainer *data);
void gwy_app_undo_redo_container (GwyContainer *data);
void gwy_app_undo_container_remove (GwyContainer *data,
const gchar *prefix);
gulong gwy_undo_checkpoint (GwyContainer *data,
...);
gulong gwy_undo_qcheckpoint (GwyContainer *data,
...);
gulong gwy_undo_checkpointv (GwyContainer *data,
guint n,
const gchar **keys);
gulong gwy_undo_qcheckpointv (GwyContainer *data,
guint n,
const GQuark *keys);
void gwy_undo_undo_container (GwyContainer *data);
void gwy_undo_redo_container (GwyContainer *data);
gboolean gwy_undo_container_has_undo (GwyContainer *data);
gboolean gwy_undo_container_has_redo (GwyContainer *data);
gint gwy_undo_container_get_modified (GwyContainer *data);
void gwy_undo_container_set_unmodified(GwyContainer *data);
void gwy_undo_container_remove (GwyContainer *data,
const gchar *prefix);
gboolean gwy_undo_get_enabled (void);
void gwy_undo_set_enabled (gboolean setting);
G_END_DECLS
#endif /* __GWY_APP_UNDO_H__ */
/* vim: set cin et ts=4 sw=4 cino=>1s,e0,n0,f0,{0,}0,^0,\:1s,=0,g1s,h0,t0,+1s,c3,(0,u0 : */
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