Mercurial > octave
view libinterp/octave-value/ov-oncleanup.cc @ 21739:c4ab2e54f100
use namespace for oct_mach_info class
* mach-info.h, mach-info.cc: Put oct_mach_info in octave namespace and
rename to mach_info. Change all uses.
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Thu, 19 May 2016 01:59:35 -0400 |
parents | aba2e6293dd8 |
children | f4d7d0eb5b0c |
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/* Copyright (C) 2010-2015 VZLU Prague 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 (HAVE_CONFIG_H) # include "config.h" #endif #include "defun.h" #include "ov-oncleanup.h" #include "ov-fcn.h" #include "ov-usr-fcn.h" #include "pt-misc.h" #include "toplev.h" DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_oncleanup, "onCleanup", "onCleanup"); octave_oncleanup::octave_oncleanup (const octave_value& f) : fcn (f) { if (f.is_function_handle ()) { octave_function *fptr = f.function_value (true); if (! fptr) error ("onCleanup: no default dispatch for function handle"); octave_user_function *uptr = dynamic_cast<octave_user_function *> (fptr); if (uptr != 0) { tree_parameter_list *pl = uptr->parameter_list (); if (pl != 0 && pl->length () > 0) warning ("onCleanup: cleanup action takes parameters"); } } else { fcn = octave_value (); error ("onCleanup: argument must be a function handle"); } } octave_oncleanup::~octave_oncleanup (void) { if (fcn.is_undefined ()) return; unwind_protect frame; // Clear interrupts. frame.protect_var (octave_interrupt_state); octave_interrupt_state = 0; // Disallow quit(). frame.protect_var (quit_allowed); quit_allowed = false; try { // Run the actual code. fcn.do_multi_index_op (0, octave_value_list ()); } catch (const octave_interrupt_exception&) { recover_from_exception (); warning ("onCleanup: interrupt occurred in cleanup action"); } catch (const octave_execution_exception&) { throw; } catch (...) // Yes, the black hole. We're in a d-tor. { // This shouldn't happen, in theory. error ("onCleanup: internal error: unhandled exception in cleanup action"); } } octave_scalar_map octave_oncleanup::scalar_map_value (void) const { octave_scalar_map retval; retval.setfield ("task", fcn); return retval; } bool octave_oncleanup::save_ascii (std::ostream& /* os */) { warning ("save: unable to save onCleanup variables, skipping"); return true; } bool octave_oncleanup::load_ascii (std::istream& /* is */) { // Silently skip object that was not saved return true; } bool octave_oncleanup::save_binary (std::ostream& /* os */, bool& /* save_as_floats */) { warning ("save: unable to save onCleanup variables, skipping"); return true; } bool octave_oncleanup::load_binary (std::istream& /* is */, bool /* swap */, octave::mach_info::float_format /* fmt */) { // Silently skip object that was not saved return true; } bool octave_oncleanup::save_hdf5 (octave_hdf5_id /* loc_id */, const char * /* name */, bool /* save_as_floats */) { warning ("save: unable to save onCleanup variables, skipping"); return true; } bool octave_oncleanup::load_hdf5 (octave_hdf5_id /* loc_id */, const char * /* name */) { // Silently skip object that was not saved return true; } void octave_oncleanup::print (std::ostream& os, bool pr_as_read_syntax) { print_raw (os, pr_as_read_syntax); newline (os); } void octave_oncleanup::print_raw (std::ostream& os, bool pr_as_read_syntax) const { os << "onCleanup ("; if (fcn.is_defined ()) fcn.print_raw (os, pr_as_read_syntax); os << ")"; } DEFUN (onCleanup, args, , "-*- texinfo -*-\n\ @deftypefn {} {@var{obj} =} onCleanup (@var{function})\n\ Create a special object that executes a given function upon destruction.\n\ \n\ If the object is copied to multiple variables (or cell or struct array\n\ elements) or returned from a function, @var{function} will be executed after\n\ clearing the last copy of the object. Note that if multiple local onCleanup\n\ variables are created, the order in which they are called is unspecified.\n\ For similar functionality @xref{The unwind_protect Statement}.\n\ @end deftypefn") { if (args.length () != 1) print_usage (); return ovl (new octave_oncleanup (args(0))); } /* %!test %! old_wstate = warning ("query"); %! unwind_protect %! trigger = onCleanup (@() warning ("on", "__MY_WARNING__")); %! warning ("off", "__MY_WARNING__"); %! assert ((warning ("query", "__MY_WARNING__")).state, "off"); %! clear trigger; %! assert ((warning ("query", "__MY_WARNING__")).state, "on"); %! unwind_protect_cleanup %! warning (old_wstate); %! end_unwind_protect */