/usr/include/octave-4.0.0/octave/error.h is in liboctave-dev 4.0.0-3ubuntu9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Copyright (C) 1993-2015 John W. Eaton
This file is part of Octave.
Octave 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.
Octave 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 Octave; see the file COPYING. If not, see
<http://www.gnu.org/licenses/>.
*/
#if !defined (octave_error_h)
#define octave_error_h 1
#include <cstdarg>
#include <string>
class octave_map;
class octave_value_list;
class unwind_protect;
#define panic_impossible() \
panic ("impossible state reached in file '%s' at line %d", __FILE__, __LINE__)
extern OCTINTERP_API void reset_error_handler (void);
extern OCTINTERP_API int warning_enabled (const std::string& id);
extern OCTINTERP_API void
vmessage (const char *name, const char *fmt, va_list args);
extern OCTINTERP_API void message (const char *name, const char *fmt, ...);
extern OCTINTERP_API void vusage (const char *fmt, va_list args);
extern OCTINTERP_API void usage (const char *fmt, ...);
extern OCTINTERP_API void vwarning (const char *fmt, va_list args);
extern OCTINTERP_API void warning (const char *fmt, ...);
extern OCTINTERP_API void verror (const char *fmt, va_list args);
extern OCTINTERP_API void error (const char *fmt, ...);
extern OCTINTERP_API void verror_with_cfn (const char *fmt, va_list args);
extern OCTINTERP_API void error_with_cfn (const char *fmt, ...);
extern OCTINTERP_API void vparse_error (const char *fmt, va_list args);
extern OCTINTERP_API void parse_error (const char *fmt, ...);
extern OCTINTERP_API void
vmessage_with_id (const char *id, const char *name,
const char *fmt, va_list args);
extern OCTINTERP_API void
message_with_id (const char *id, const char *name, const char *fmt, ...);
extern OCTINTERP_API void
vusage_with_id (const char *id, const char *fmt, va_list args);
extern OCTINTERP_API void
usage_with_id (const char *id, const char *fmt, ...);
extern OCTINTERP_API void
vwarning_with_id (const char *id, const char *fmt, va_list args);
extern OCTINTERP_API void
warning_with_id (const char *id, const char *fmt, ...);
extern OCTINTERP_API void
verror_with_id (const char *id, const char *fmt, va_list args);
extern OCTINTERP_API void
error_with_id (const char *id, const char *fmt, ...);
extern OCTINTERP_API void
verror_with_id_cfn (const char *id, const char *fmt, va_list args);
extern OCTINTERP_API void
error_with_id_cfn (const char *id, const char *fmt, ...);
extern OCTINTERP_API void
vparse_error_with_id (const char *id, const char *fmt, va_list args);
extern OCTINTERP_API void
parse_error_with_id (const char *id, const char *fmt, ...);
extern OCTINTERP_API void panic (const char *fmt, ...) GCC_ATTR_NORETURN;
// Helper function for print_usage defined in defun.cc.
extern OCTINTERP_API void defun_usage_message (const std::string& msg);
extern OCTINTERP_API octave_value_list
set_warning_state (const std::string& id, const std::string& state);
extern OCTINTERP_API octave_value_list
set_warning_state (const octave_value_list& args);
extern OCTINTERP_API void disable_warning (const std::string& id);
extern OCTINTERP_API void initialize_default_warning_state (void);
// TRUE means that Octave will try to enter the debugger when an error
// is encountered. This will also inhibit printing of the normal
// traceback message (you will only see the top-level error message).
extern OCTINTERP_API bool Vdebug_on_error;
// TRUE means that Octave will try to enter the debugger when a warning
// is encountered.
extern OCTINTERP_API bool Vdebug_on_warning;
// Current error state.
extern OCTINTERP_API int error_state;
// Current warning state.
extern OCTINTERP_API int warning_state;
// Tell the error handler whether to print messages, or just store
// them for later. Used for handling errors in eval() and
// the 'unwind_protect' statement.
extern OCTINTERP_API int buffer_error_messages;
// TRUE means error messages are turned off.
extern OCTINTERP_API bool discard_error_messages;
// TRUE means warning messages are turned off.
extern OCTINTERP_API bool discard_warning_messages;
// Helper functions to pass last error and warning messages and ids
extern OCTINTERP_API std::string last_error_message (void);
extern OCTINTERP_API std::string last_error_id (void);
extern OCTINTERP_API octave_map last_error_stack (void);
extern OCTINTERP_API std::string last_warning_message (void);
extern OCTINTERP_API std::string last_warning_id (void);
extern OCTINTERP_API void interpreter_try (unwind_protect&);
#endif
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