Mercurial > octave
annotate liboctave/util/unwind-prot.h @ 31605:e88a07dec498 stable
maint: Use macros to begin/end C++ namespaces.
* oct-conf-post-public.in.h: Define two macros (OCTAVE_BEGIN_NAMESPACE,
OCTAVE_END_NAMESPACE) that can be used to start/end a namespace.
* mk-opts.pl, build-env.h, build-env.in.cc, __betainc__.cc, __contourc__.cc,
__dsearchn__.cc, __eigs__.cc, __expint__.cc, __ftp__.cc, __gammainc__.cc,
__ichol__.cc, __ilu__.cc, __isprimelarge__.cc, __lin_interpn__.cc,
__magick_read__.cc, __pchip_deriv__.cc, __qp__.cc, amd.cc, auto-shlib.cc,
auto-shlib.h, balance.cc, base-text-renderer.cc, base-text-renderer.h,
besselj.cc, bitfcns.cc, bsxfun.cc, c-file-ptr-stream.cc, c-file-ptr-stream.h,
call-stack.cc, call-stack.h, ccolamd.cc, cellfun.cc, chol.cc, colamd.cc,
colloc.cc, conv2.cc, daspk.cc, dasrt.cc, dassl.cc, data.cc, data.h, debug.cc,
defaults.cc, defaults.h, defun-int.h, defun.cc, det.cc, dirfns.cc, display.cc,
display.h, dlmread.cc, dmperm.cc, dot.cc, dynamic-ld.cc, dynamic-ld.h, eig.cc,
ellipj.cc, environment.cc, environment.h, error.cc, error.h, errwarn.h,
event-manager.cc, event-manager.h, event-queue.cc, event-queue.h, fcn-info.cc,
fcn-info.h, fft.cc, fft2.cc, fftn.cc, file-io.cc, filter.cc, find.cc,
ft-text-renderer.cc, ft-text-renderer.h, gcd.cc, getgrent.cc, getpwent.cc,
getrusage.cc, givens.cc, gl-render.cc, gl-render.h, gl2ps-print.cc,
gl2ps-print.h, graphics-toolkit.cc, graphics-toolkit.h, graphics.cc,
graphics.in.h, gsvd.cc, gtk-manager.cc, gtk-manager.h, hash.cc, help.cc,
help.h, hess.cc, hex2num.cc, hook-fcn.cc, hook-fcn.h, input.cc, input.h,
interpreter-private.cc, interpreter-private.h, interpreter.cc, interpreter.h,
inv.cc, jsondecode.cc, jsonencode.cc, kron.cc, latex-text-renderer.cc,
latex-text-renderer.h, load-path.cc, load-path.h, load-save.cc, load-save.h,
lookup.cc, ls-ascii-helper.cc, ls-ascii-helper.h, ls-oct-text.cc, ls-utils.cc,
ls-utils.h, lsode.cc, lu.cc, mappers.cc, matrix_type.cc, max.cc, mex-private.h,
mex.cc, mgorth.cc, nproc.cc, oct-fstrm.cc, oct-fstrm.h, oct-hdf5-types.cc,
oct-hdf5-types.h, oct-hist.cc, oct-hist.h, oct-iostrm.cc, oct-iostrm.h,
oct-opengl.h, oct-prcstrm.cc, oct-prcstrm.h, oct-procbuf.cc, oct-procbuf.h,
oct-process.cc, oct-process.h, oct-stdstrm.h, oct-stream.cc, oct-stream.h,
oct-strstrm.cc, oct-strstrm.h, oct-tex-lexer.in.ll, oct-tex-parser.yy,
ordqz.cc, ordschur.cc, pager.cc, pager.h, pinv.cc, pow2.cc, pr-flt-fmt.cc,
pr-output.cc, procstream.cc, procstream.h, psi.cc, qr.cc, quad.cc, quadcc.cc,
qz.cc, rand.cc, rcond.cc, regexp.cc, schur.cc, settings.cc, settings.h,
sighandlers.cc, sighandlers.h, sparse-xdiv.cc, sparse-xdiv.h, sparse-xpow.cc,
sparse-xpow.h, sparse.cc, spparms.cc, sqrtm.cc, stack-frame.cc, stack-frame.h,
stream-euler.cc, strfind.cc, strfns.cc, sub2ind.cc, svd.cc, sylvester.cc,
symbfact.cc, syminfo.cc, syminfo.h, symrcm.cc, symrec.cc, symrec.h,
symscope.cc, symscope.h, symtab.cc, symtab.h, syscalls.cc, sysdep.cc, sysdep.h,
text-engine.cc, text-engine.h, text-renderer.cc, text-renderer.h, time.cc,
toplev.cc, tril.cc, tsearch.cc, typecast.cc, url-handle-manager.cc,
url-handle-manager.h, urlwrite.cc, utils.cc, utils.h, variables.cc,
variables.h, xdiv.cc, xdiv.h, xnorm.cc, xnorm.h, xpow.cc, xpow.h,
__delaunayn__.cc, __fltk_uigetfile__.cc, __glpk__.cc, __init_fltk__.cc,
__init_gnuplot__.cc, __ode15__.cc, __voronoi__.cc, audiodevinfo.cc,
audioread.cc, convhulln.cc, fftw.cc, gzip.cc, mk-build-env-features.sh,
mk-builtins.pl, cdef-class.cc, cdef-class.h, cdef-fwd.h, cdef-manager.cc,
cdef-manager.h, cdef-method.cc, cdef-method.h, cdef-object.cc, cdef-object.h,
cdef-package.cc, cdef-package.h, cdef-property.cc, cdef-property.h,
cdef-utils.cc, cdef-utils.h, ov-base.cc, ov-base.h, ov-bool-mat.cc,
ov-builtin.h, ov-cell.cc, ov-class.cc, ov-class.h, ov-classdef.cc,
ov-classdef.h, ov-complex.cc, ov-fcn-handle.cc, ov-fcn-handle.h, ov-fcn.h,
ov-java.cc, ov-java.h, ov-mex-fcn.h, ov-null-mat.cc, ov-oncleanup.cc,
ov-struct.cc, ov-typeinfo.cc, ov-typeinfo.h, ov-usr-fcn.cc, ov-usr-fcn.h,
ov.cc, ov.h, octave.cc, octave.h, mk-ops.sh, op-b-b.cc, op-b-bm.cc,
op-b-sbm.cc, op-bm-b.cc, op-bm-bm.cc, op-bm-sbm.cc, op-cdm-cdm.cc, op-cell.cc,
op-chm.cc, op-class.cc, op-cm-cm.cc, op-cm-cs.cc, op-cm-m.cc, op-cm-s.cc,
op-cm-scm.cc, op-cm-sm.cc, op-cs-cm.cc, op-cs-cs.cc, op-cs-m.cc, op-cs-s.cc,
op-cs-scm.cc, op-cs-sm.cc, op-dm-dm.cc, op-dm-scm.cc, op-dm-sm.cc,
op-dm-template.cc, op-dms-template.cc, op-fcdm-fcdm.cc, op-fcm-fcm.cc,
op-fcm-fcs.cc, op-fcm-fm.cc, op-fcm-fs.cc, op-fcn.cc, op-fcs-fcm.cc,
op-fcs-fcs.cc, op-fcs-fm.cc, op-fcs-fs.cc, op-fdm-fdm.cc, op-fm-fcm.cc,
op-fm-fcs.cc, op-fm-fm.cc, op-fm-fs.cc, op-fs-fcm.cc, op-fs-fcs.cc,
op-fs-fm.cc, op-fs-fs.cc, op-i16-i16.cc, op-i32-i32.cc, op-i64-i64.cc,
op-i8-i8.cc, op-int-concat.cc, op-m-cm.cc, op-m-cs.cc, op-m-m.cc, op-m-s.cc,
op-m-scm.cc, op-m-sm.cc, op-mi.cc, op-pm-pm.cc, op-pm-scm.cc, op-pm-sm.cc,
op-pm-template.cc, op-range.cc, op-s-cm.cc, op-s-cs.cc, op-s-m.cc, op-s-s.cc,
op-s-scm.cc, op-s-sm.cc, op-sbm-b.cc, op-sbm-bm.cc, op-sbm-sbm.cc,
op-scm-cm.cc, op-scm-cs.cc, op-scm-m.cc, op-scm-s.cc, op-scm-scm.cc,
op-scm-sm.cc, op-sm-cm.cc, op-sm-cs.cc, op-sm-m.cc, op-sm-s.cc, op-sm-scm.cc,
op-sm-sm.cc, op-str-m.cc, op-str-s.cc, op-str-str.cc, op-struct.cc,
op-ui16-ui16.cc, op-ui32-ui32.cc, op-ui64-ui64.cc, op-ui8-ui8.cc, ops.h,
anon-fcn-validator.cc, anon-fcn-validator.h, bp-table.cc, bp-table.h,
comment-list.cc, comment-list.h, filepos.h, lex.h, lex.ll, oct-lvalue.cc,
oct-lvalue.h, oct-parse.yy, parse.h, profiler.cc, profiler.h,
pt-anon-scopes.cc, pt-anon-scopes.h, pt-arg-list.cc, pt-arg-list.h,
pt-args-block.cc, pt-args-block.h, pt-array-list.cc, pt-array-list.h,
pt-assign.cc, pt-assign.h, pt-binop.cc, pt-binop.h, pt-bp.cc, pt-bp.h,
pt-cbinop.cc, pt-cbinop.h, pt-cell.cc, pt-cell.h, pt-check.cc, pt-check.h,
pt-classdef.cc, pt-classdef.h, pt-cmd.h, pt-colon.cc, pt-colon.h, pt-const.cc,
pt-const.h, pt-decl.cc, pt-decl.h, pt-eval.cc, pt-eval.h, pt-except.cc,
pt-except.h, pt-exp.cc, pt-exp.h, pt-fcn-handle.cc, pt-fcn-handle.h, pt-id.cc,
pt-id.h, pt-idx.cc, pt-idx.h, pt-jump.h, pt-loop.cc, pt-loop.h, pt-mat.cc,
pt-mat.h, pt-misc.cc, pt-misc.h, pt-pr-code.cc, pt-pr-code.h, pt-select.cc,
pt-select.h, pt-spmd.cc, pt-spmd.h, pt-stmt.cc, pt-stmt.h, pt-tm-const.cc,
pt-tm-const.h, pt-unop.cc, pt-unop.h, pt-vm-eval.cc, pt-walk.cc, pt-walk.h,
pt.cc, pt.h, token.cc, token.h, Range.cc, Range.h, idx-vector.cc, idx-vector.h,
range-fwd.h, CollocWt.cc, CollocWt.h, aepbalance.cc, aepbalance.h, chol.cc,
chol.h, gepbalance.cc, gepbalance.h, gsvd.cc, gsvd.h, hess.cc, hess.h,
lo-mappers.cc, lo-mappers.h, lo-specfun.cc, lo-specfun.h, lu.cc, lu.h,
oct-convn.cc, oct-convn.h, oct-fftw.cc, oct-fftw.h, oct-norm.cc, oct-norm.h,
oct-rand.cc, oct-rand.h, oct-spparms.cc, oct-spparms.h, qr.cc, qr.h, qrp.cc,
qrp.h, randgamma.cc, randgamma.h, randmtzig.cc, randmtzig.h, randpoisson.cc,
randpoisson.h, schur.cc, schur.h, sparse-chol.cc, sparse-chol.h, sparse-lu.cc,
sparse-lu.h, sparse-qr.cc, sparse-qr.h, svd.cc, svd.h, child-list.cc,
child-list.h, dir-ops.cc, dir-ops.h, file-ops.cc, file-ops.h, file-stat.cc,
file-stat.h, lo-sysdep.cc, lo-sysdep.h, lo-sysinfo.cc, lo-sysinfo.h,
mach-info.cc, mach-info.h, oct-env.cc, oct-env.h, oct-group.cc, oct-group.h,
oct-password.cc, oct-password.h, oct-syscalls.cc, oct-syscalls.h, oct-time.cc,
oct-time.h, oct-uname.cc, oct-uname.h, action-container.cc, action-container.h,
base-list.h, cmd-edit.cc, cmd-edit.h, cmd-hist.cc, cmd-hist.h, f77-fcn.h,
file-info.cc, file-info.h, lo-array-errwarn.cc, lo-array-errwarn.h, lo-hash.cc,
lo-hash.h, lo-ieee.h, lo-regexp.cc, lo-regexp.h, lo-utils.cc, lo-utils.h,
oct-base64.cc, oct-base64.h, oct-glob.cc, oct-glob.h, oct-inttypes.h,
oct-mutex.cc, oct-mutex.h, oct-refcount.h, oct-shlib.cc, oct-shlib.h,
oct-sparse.cc, oct-sparse.h, oct-string.h, octave-preserve-stream-state.h,
pathsearch.cc, pathsearch.h, quit.cc, quit.h, unwind-prot.cc, unwind-prot.h,
url-transfer.cc, url-transfer.h : Use new macros to begin/end C++ namespaces.
author | Rik <rik@octave.org> |
---|---|
date | Thu, 01 Dec 2022 14:23:45 -0800 |
parents | 796f54d4ddbf |
children | aac27ad79be6 |
rev | line source |
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1 //////////////////////////////////////////////////////////////////////// |
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2 // |
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3 // Copyright (C) 1993-2022 The Octave Project Developers |
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4 // |
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5 // See the file COPYRIGHT.md in the top-level directory of this |
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6 // distribution or <https://octave.org/copyright/>. |
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7 // |
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8 // This file is part of Octave. |
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9 // |
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10 // Octave is free software: you can redistribute it and/or modify it |
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11 // under the terms of the GNU General Public License as published by |
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12 // the Free Software Foundation, either version 3 of the License, or |
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13 // (at your option) any later version. |
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14 // |
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15 // Octave is distributed in the hope that it will be useful, but |
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 // GNU General Public License for more details. |
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19 // |
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20 // You should have received a copy of the GNU General Public License |
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21 // along with Octave; see the file COPYING. If not, see |
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22 // <https://www.gnu.org/licenses/>. |
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23 // |
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24 //////////////////////////////////////////////////////////////////////// |
1 | 25 |
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26 #if ! defined (octave_unwind_prot_h) |
383 | 27 #define octave_unwind_prot_h 1 |
1 | 28 |
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29 #include "octave-config.h" |
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30 |
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31 #include <cstddef> |
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32 |
15396 | 33 #include <stack> |
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34 #include <memory> |
240 | 35 |
15396 | 36 #include "action-container.h" |
37 | |
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38 OCTAVE_BEGIN_NAMESPACE(octave) |
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39 |
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40 class |
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41 OCTAVE_API |
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42 unwind_protect : public action_container |
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43 { |
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44 public: |
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45 |
27177 | 46 unwind_protect (void) : m_lifo () { } |
2985 | 47 |
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48 // No copying! |
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49 |
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50 unwind_protect (const unwind_protect&) = delete; |
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51 |
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52 unwind_protect& operator = (const unwind_protect&) = delete; |
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53 |
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54 // Destructor should not raise an exception, so all actions |
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55 // registered should be exception-safe. If you're not sure, see |
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56 // unwind_protect_safe. |
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57 |
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58 ~unwind_protect (void) { run (); } |
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59 |
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60 operator bool (void) const { return ! empty (); } |
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61 |
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62 void run_first (void) |
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63 { |
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64 if (! empty ()) |
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65 { |
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66 // No leak on exception! |
27177 | 67 std::unique_ptr<elem> ptr (m_lifo.top ()); |
68 m_lifo.pop (); | |
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69 ptr->run (); |
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70 } |
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71 } |
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72 |
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73 void discard_first (void) |
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74 { |
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75 if (! empty ()) |
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76 { |
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79 delete ptr; |
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80 } |
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81 } |
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82 |
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83 std::size_t size (void) const { return m_lifo.size (); } |
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84 |
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85 protected: |
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86 |
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87 virtual void add_action (elem *new_elem) |
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88 { |
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90 } |
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91 |
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93 }; |
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94 |
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95 // Like unwind_protect, but this one will guard against the possibility |
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96 // of seeing an exception (or interrupt) in the cleanup actions. |
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97 // Not that we can do much about it, but at least we won't crash. |
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98 |
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99 class |
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100 OCTAVE_API |
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101 unwind_protect_safe : public unwind_protect |
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103 private: |
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104 |
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105 void warn_unhandled_exception (void) const; |
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106 |
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107 public: |
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108 |
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109 unwind_protect_safe (void) : unwind_protect () { } |
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110 |
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111 // No copying! |
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112 |
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113 unwind_protect_safe (const unwind_protect_safe&) = delete; |
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114 |
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115 unwind_protect_safe& operator = (const unwind_protect_safe&) = delete; |
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116 |
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117 ~unwind_protect_safe (void) |
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118 { |
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119 while (! empty ()) |
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120 { |
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121 try |
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122 { |
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123 run_first (); |
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124 } |
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125 catch (...) // Yes, the black hole. Remember we're in a destructor. |
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126 { |
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127 warn_unhandled_exception (); |
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128 } |
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129 } |
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130 } |
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131 }; |
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132 |
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133 // In most cases, the following are preferred for efficiency. Some |
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134 // cases may require the flexibility of the general unwind_protect |
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135 // mechanism defined above. |
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136 |
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137 // Perform action at end of the current scope when unwind_action |
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138 // object destructor is called. |
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139 // |
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140 // For example: |
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141 // |
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142 // void fcn (int val) { ... } |
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143 // |
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144 // ... |
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145 // |
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146 // { |
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147 // int val = 42; |
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148 // |
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149 // // template parameters, std::bind and std::function provide |
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150 // // flexibility in calling forms (function pointer or lambda): |
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151 // |
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152 // unwind_action act1 (fcn, val); |
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153 // unwind_action act2 ([val] (void) { fcn (val); }); |
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154 // } |
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155 // |
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156 // NOTE: Don't forget to provide a name for the unwind_action |
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157 // variable. If you write |
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158 // |
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159 // unwind_action /* NO NAME! */ (...); |
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160 // |
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161 // then the destructor for the temporary anonymous object will be |
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162 // called immediately after the object is constructed instead of at |
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163 // the end of the current scope. |
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164 |
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165 class OCTAVE_API unwind_action |
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166 { |
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167 public: |
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168 |
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169 unwind_action (void) : m_fcn () { } |
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170 |
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171 // FIXME: Do we need to apply std::forward to the arguments to |
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172 // std::bind here? |
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173 |
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174 template <typename F, typename... Args> |
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175 unwind_action (F&& fcn, Args&&... args) |
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176 : m_fcn (std::bind (fcn, args...)) |
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177 { } |
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178 |
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179 // No copying! |
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180 |
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181 unwind_action (const unwind_action&) = delete; |
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182 |
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183 unwind_action& operator = (const unwind_action&) = delete; |
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184 |
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185 ~unwind_action (void) { run (); } |
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186 |
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187 // FIXME: Do we need to apply std::forward to the arguments to |
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188 // std::bind here? |
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189 |
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190 template <typename F, typename... Args> |
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191 void set (F&& fcn, Args&&... args) |
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192 { |
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193 m_fcn = std::bind (fcn, args...); |
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194 } |
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195 |
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196 void set (void) { m_fcn = nullptr; } |
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197 |
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198 // Alias for set() which is clearer about programmer intention. |
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199 void discard (void) { set (); } |
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200 |
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201 void run (void) |
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202 { |
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203 if (m_fcn) |
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204 m_fcn (); |
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205 |
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206 // Invalidate so action won't run again when object is deleted. |
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207 discard (); |
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208 } |
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209 |
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210 private: |
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211 |
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212 std::function<void (void)> m_fcn; |
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213 }; |
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214 |
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215 // Like unwind_action, but this one will guard against the possibility |
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216 // of seeing an exception (or interrupt) in the cleanup actions. |
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217 // Not that we can do much about it, but at least we won't crash. |
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218 |
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219 class OCTAVE_API unwind_action_safe |
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220 { |
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221 private: |
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222 |
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223 void warn_unhandled_exception (void) const; |
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224 |
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225 public: |
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226 |
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227 unwind_action_safe (void) : m_fcn () { } |
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228 |
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229 // FIXME: Do we need to apply std::forward to the arguments to |
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230 // std::bind here? |
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231 |
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232 template <typename F, typename... Args> |
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233 unwind_action_safe (F&& fcn, Args&&... args) |
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234 : m_fcn (std::bind (fcn, args...)) |
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235 { } |
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236 |
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237 // No copying! |
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238 |
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239 unwind_action_safe (const unwind_action_safe&) = delete; |
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240 |
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241 unwind_action_safe& operator = (const unwind_action_safe&) = delete; |
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242 |
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243 ~unwind_action_safe (void) { run (); } |
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244 |
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245 // FIXME: Do we need to apply std::forward to the arguments to |
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246 // std::bind here? |
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247 |
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248 template <typename F, typename... Args> |
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249 void set (F&& fcn, Args&&... args) |
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250 { |
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251 m_fcn = std::bind (fcn, args...); |
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252 } |
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253 |
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254 void set (void) { m_fcn = nullptr; } |
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255 |
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256 // Alias for set() which is clearer about programmer intention. |
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257 void discard (void) { set (); } |
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258 |
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259 void run (void) |
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260 { |
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261 try |
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262 { |
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263 if (m_fcn) |
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264 m_fcn (); |
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265 } |
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266 catch (...) // Yes, the black hole. Remember we're in a destructor. |
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267 { |
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268 warn_unhandled_exception (); |
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269 } |
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270 |
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271 // Invalidate so action won't run again when object is deleted. |
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272 discard (); |
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273 } |
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274 |
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275 private: |
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276 |
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277 std::function<void (void)> m_fcn; |
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278 }; |
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279 |
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280 // Reset a variable value at the end of the current scope when |
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281 // unwind_protect_var object destructor is called. |
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282 // |
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283 // For example: |
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284 // |
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285 // { |
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286 // int x = 42; |
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287 // unwind_protect_var<int> upv (x); // X will be reset at end of scope |
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288 // x = 13; // Set temporary value. |
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289 // } |
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290 // |
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291 // Temporary value may be set at construction: |
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292 // |
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293 // { |
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294 // int x = ...; |
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295 // unwind_protect_var<int> upv (x, 13); // X will be reset. |
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296 // // temporary value is 13. |
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297 // } |
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298 // |
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299 // NOTE: Don't forget to provide a name for the unwind_protect_var |
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300 // variable. If you write |
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301 // |
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302 // unwind_protect_var<type> /* NO NAME! */ (...); |
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303 // |
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304 // then the destructor for the temporary anonymous object will be |
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305 // called immediately after the object is constructed instead of at |
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306 // the end of the current scope. |
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307 // |
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308 // FIXME: Once we are able to use C++17, class template argument |
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309 // deduction will allow us to omit the explicit template type from the |
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310 // constructor expression: |
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311 // |
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312 // unwind_protect_var upv (...); |
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313 |
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314 template <typename T> |
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315 class unwind_protect_var |
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316 { |
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317 public: |
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318 |
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319 // Ensure that the value referenced by REF will be reset when this |
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320 // unwind_protect_var object goes out of scope. |
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321 |
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322 explicit unwind_protect_var (T& ref) |
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323 : m_ref (ref), m_val (ref) |
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324 { } |
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325 |
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326 // Set the value referenced by REF to NEW_VAL and ensure that it |
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327 // will be reset to its original value when this |
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328 // unwind_protect_var object goes out of scope. |
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329 |
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330 unwind_protect_var (T& ref, const T& new_val) |
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331 : m_ref (ref), m_val (ref) |
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332 { |
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333 m_ref = new_val; |
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334 } |
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335 |
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336 // No copying! |
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337 |
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338 unwind_protect_var (const unwind_protect_var&) = delete; |
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339 |
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340 unwind_protect_var& operator = (const unwind_protect_var&) = delete; |
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341 |
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342 ~unwind_protect_var (void) |
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343 { |
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344 m_ref = m_val; |
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345 } |
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346 |
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347 private: |
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348 |
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349 T& m_ref; |
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350 T m_val; |
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351 }; |
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352 |
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353 OCTAVE_END_NAMESPACE(octave) |
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354 |
1 | 355 #endif |