Mercurial > octave-nkf
annotate liboctave/util/unwind-prot.h @ 20595:c1a6c31ac29a
eliminate more simple uses of error_state
* ov-classdef.cc: Eliminate simple uses of error_state.
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Tue, 06 Oct 2015 00:20:02 -0400 |
| parents | c547458dc10e |
| children |
| rev | line source |
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| 1 | 1 /* |
| 2 | |
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3 Copyright (C) 1993-2015 John W. Eaton |
| 11523 | 4 Copyright (C) 2009-2010 VZLU Prague |
| 1 | 5 |
| 6 This file is part of Octave. | |
| 7 | |
| 8 Octave is free software; you can redistribute it and/or modify it | |
| 9 under the terms of the GNU General Public License as published by the | |
| 7016 | 10 Free Software Foundation; either version 3 of the License, or (at your |
| 11 option) any later version. | |
| 1 | 12 |
| 13 Octave is distributed in the hope that it will be useful, but WITHOUT | |
| 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 16 for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 7016 | 19 along with Octave; see the file COPYING. If not, see |
| 20 <http://www.gnu.org/licenses/>. | |
| 1 | 21 |
| 22 */ | |
| 23 | |
| 383 | 24 #if !defined (octave_unwind_prot_h) |
| 25 #define octave_unwind_prot_h 1 | |
| 1 | 26 |
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27 #include <cstddef> |
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28 |
| 15396 | 29 #include <stack> |
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30 #include <memory> |
| 240 | 31 |
| 15396 | 32 #include "action-container.h" |
| 33 | |
| 2985 | 34 class |
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35 OCTAVE_API |
| 15396 | 36 unwind_protect : public action_container |
| 2985 | 37 { |
| 38 public: | |
| 39 | |
| 15396 | 40 unwind_protect (void) : lifo () { } |
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41 |
| 15396 | 42 // Destructor should not raise an exception, so all actions |
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43 // registered should be exception-safe. If you're not sure, see |
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44 // unwind_protect_safe. |
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45 |
| 15396 | 46 ~unwind_protect (void) { run (); } |
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47 |
| 15396 | 48 virtual void add (elem *new_elem) |
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49 { |
| 15396 | 50 lifo.push (new_elem); |
| 51 } | |
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52 |
| 15396 | 53 void add (void (*fcn) (void *), void *ptr = 0) GCC_ATTR_DEPRECATED |
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54 { |
| 15396 | 55 add (new fcn_arg_elem<void *> (fcn, ptr)); |
| 56 } | |
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57 |
| 15396 | 58 operator bool (void) const { return ! empty (); } |
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59 |
| 15396 | 60 void run_top (void) GCC_ATTR_DEPRECATED { run_first (); } |
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61 |
| 15396 | 62 void run_first (void) |
| 63 { | |
| 64 if (! empty ()) | |
| 65 { | |
| 66 // No leak on exception! | |
| 67 std::auto_ptr<elem> ptr (lifo.top ()); | |
| 68 lifo.pop (); | |
| 69 ptr->run (); | |
| 70 } | |
| 71 } | |
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72 |
| 15396 | 73 void run_top (int num) GCC_ATTR_DEPRECATED { run (num); } |
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74 |
| 15396 | 75 void discard_top (void) GCC_ATTR_DEPRECATED { discard_first (); } |
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76 |
| 15396 | 77 void discard_first (void) |
| 78 { | |
| 79 if (! empty ()) | |
| 80 { | |
| 81 elem *ptr = lifo.top (); | |
| 82 lifo.pop (); | |
| 83 delete ptr; | |
| 84 } | |
| 85 } | |
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86 |
| 15396 | 87 void discard_top (int num) GCC_ATTR_DEPRECATED { discard (num); } |
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88 |
| 15396 | 89 size_t size (void) const { return lifo.size (); } |
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90 |
| 15396 | 91 protected: |
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92 |
| 15396 | 93 std::stack<elem *> lifo; |
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94 |
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95 private: |
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96 |
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97 // No copying! |
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98 |
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99 unwind_protect (const unwind_protect&); |
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100 |
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101 unwind_protect& operator = (const unwind_protect&); |
| 2985 | 102 }; |
| 103 | |
| 15396 | 104 // Like unwind_protect, but this one will guard against the |
| 105 // possibility of seeing an exception (or interrupt) in the cleanup | |
| 106 // actions. Not that we can do much about it, but at least we won't | |
| 107 // crash. | |
| 2985 | 108 |
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109 class |
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110 OCTAVE_API |
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111 unwind_protect_safe : public unwind_protect |
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112 { |
| 15396 | 113 private: |
| 114 | |
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115 static void gripe_exception (void); |
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116 |
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117 public: |
| 15396 | 118 |
| 119 unwind_protect_safe (void) : unwind_protect () { } | |
| 120 | |
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121 ~unwind_protect_safe (void) |
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122 { |
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123 while (! empty ()) |
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124 { |
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125 try |
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126 { |
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127 run_first (); |
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128 } |
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129 catch (...) // Yes, the black hole. Remember we're in a dtor. |
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130 { |
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131 gripe_exception (); |
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132 } |
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133 } |
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134 } |
| 15396 | 135 |
| 136 private: | |
| 137 | |
| 138 // No copying! | |
| 139 | |
| 140 unwind_protect_safe (const unwind_protect_safe&); | |
| 141 | |
| 142 unwind_protect_safe& operator = (const unwind_protect_safe&); | |
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143 }; |
| 2985 | 144 |
| 1 | 145 #endif |