/usr/include/glibmm-2.4/glibmm/error.h is in libglibmm-2.4-dev 2.46.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#ifndef _GLIBMM_ERROR_H
#define _GLIBMM_ERROR_H
/* Copyright 2002 The gtkmm Development Team
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <glibmmconfig.h>
#include <glibmm/exception.h>
#include <glib.h>
namespace Glib
{
class Error : public Glib::Exception
{
public:
  Error();
  Error(GQuark error_domain, int error_code, const Glib::ustring& message);
  explicit Error(GError* gobject, bool take_copy = false);
  Error(const Error& other);
  Error& operator=(const Error& other);
  virtual ~Error() noexcept;
  GQuark domain() const;
  int code() const;
  Glib::ustring what() const override;
  bool matches(GQuark error_domain, int error_code) const;
  GError* gobj();
  const GError* gobj() const;
#ifndef DOXYGEN_SHOULD_SKIP_THIS
  void propagate(GError** dest);
  typedef void (* ThrowFunc) (GError*);
  static void register_init();
  static void register_cleanup();
  static void register_domain(GQuark error_domain, ThrowFunc throw_func);
  static void throw_exception(GError* gobject) G_GNUC_NORETURN;
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
protected:
  GError* gobject_;
};
} // namespace Glib
#endif /* _GLIBMM_ERROR_H */
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