| 1 | //////////////////////////////////////////////////////////////////////////////// |
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| 2 | // The Loki Library |
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| 3 | // Copyright (c) 2000 Andrei Alexandrescu |
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| 4 | // Copyright (c) 2000 Petru Marginean |
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| 5 | // Copyright (c) 2005 Joshua Lehrer |
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| 6 | // |
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| 7 | // Permission to use, copy, modify, distribute and sell this software for any |
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| 8 | // purpose is hereby granted without fee, provided that the above copyright |
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| 9 | // notice appear in all copies and that both that copyright notice and this |
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| 10 | // permission notice appear in supporting documentation. |
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| 11 | // The author makes no representations about the |
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| 12 | // suitability of this software for any purpose. It is provided "as is" |
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| 13 | // without express or implied warranty. |
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| 14 | // |
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| 15 | // Changes by Orxonox (Reto Grieder) |
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| 16 | // Moved one protected variable to the public section to allow the use of |
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| 17 | // the ScopeGuard in a class definition. |
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| 18 | //////////////////////////////////////////////////////////////////////////////// |
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| 19 | #ifndef LOKI_SCOPEGUARD_INC_ |
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| 20 | #define LOKI_SCOPEGUARD_INC_ |
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| 21 | |
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| 22 | // $Id: ScopeGuard.h 799 2006-12-20 00:37:13Z rich_sposato $ |
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| 23 | |
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| 24 | |
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| 25 | #include <loki/RefToValue.h> |
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| 26 | |
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| 27 | /// \defgroup ExceptionGroup Exception-safe code |
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| 28 | |
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| 29 | namespace Loki |
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| 30 | { |
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| 31 | |
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| 32 | //////////////////////////////////////////////////////////////// |
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| 33 | /// |
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| 34 | /// \class ScopeGuardImplBase |
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| 35 | /// \ingroup ExceptionGroup |
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| 36 | /// |
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| 37 | /// Base class used by all ScopeGuard implementations. All commonly used |
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| 38 | /// functions are in this class (e.g. - Dismiss and SafeExecute). |
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| 39 | /// |
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| 40 | /// See Andrei's and Petru Marginean's CUJ article |
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| 41 | /// http://www.cuj.com/documents/s=8000/cujcexp1812alexandr/alexandr.htm |
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| 42 | /// |
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| 43 | /// Changes to the original code by Joshua Lehrer: |
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| 44 | /// http://www.lehrerfamily.com/scopeguard.html |
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| 45 | //////////////////////////////////////////////////////////////// |
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| 46 | |
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| 47 | class ScopeGuardImplBase |
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| 48 | { |
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| 49 | /// Copy-assignment operator is not implemented and private. |
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| 50 | ScopeGuardImplBase& operator =(const ScopeGuardImplBase&); |
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| 51 | |
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| 52 | protected: |
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| 53 | |
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| 54 | ~ScopeGuardImplBase() |
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| 55 | {} |
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| 56 | |
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| 57 | /// Copy-constructor takes over responsibility from other ScopeGuard. |
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| 58 | ScopeGuardImplBase(const ScopeGuardImplBase& other) throw() |
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| 59 | : dismissed_(other.dismissed_) |
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| 60 | { |
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| 61 | other.Dismiss(); |
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| 62 | } |
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| 63 | |
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| 64 | template <typename J> |
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| 65 | static void SafeExecute(J& j) throw() |
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| 66 | { |
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| 67 | if (!j.dismissed_) |
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| 68 | try |
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| 69 | { |
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| 70 | j.Execute(); |
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| 71 | } |
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| 72 | catch(...) |
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| 73 | {} |
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| 74 | } |
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| 75 | |
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| 76 | mutable bool dismissed_; |
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| 77 | |
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| 78 | public: |
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| 79 | ScopeGuardImplBase() throw() : dismissed_(false) |
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| 80 | {} |
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| 81 | |
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| 82 | void Dismiss() const throw() |
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| 83 | { |
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| 84 | dismissed_ = true; |
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| 85 | } |
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| 86 | }; |
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| 87 | |
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| 88 | //////////////////////////////////////////////////////////////// |
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| 89 | /// |
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| 90 | /// \typedef typedef const ScopeGuardImplBase& ScopeGuard |
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| 91 | /// \ingroup ExceptionGroup |
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| 92 | /// |
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| 93 | //////////////////////////////////////////////////////////////// |
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| 94 | |
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| 95 | typedef const ScopeGuardImplBase& ScopeGuard; |
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| 96 | |
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| 97 | //////////////////////////////////////////////////////////////// |
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| 98 | /// |
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| 99 | /// \class ScopeGuardImpl0 |
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| 100 | /// \ingroup ExceptionGroup |
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| 101 | /// |
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| 102 | /// Implementation class for a standalone function or class static function |
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| 103 | /// with no parameters. ScopeGuard ignores any value returned from the |
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| 104 | /// call within the Execute function. |
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| 105 | /// |
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| 106 | /// This class has a single standalone helper function, MakeGuard which |
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| 107 | /// creates and returns a ScopeGuard. |
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| 108 | /// |
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| 109 | //////////////////////////////////////////////////////////////// |
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| 110 | |
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| 111 | template <typename F> |
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| 112 | class ScopeGuardImpl0 : public ScopeGuardImplBase |
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| 113 | { |
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| 114 | public: |
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| 115 | static ScopeGuardImpl0<F> MakeGuard(F fun) |
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| 116 | { |
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| 117 | return ScopeGuardImpl0<F>(fun); |
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| 118 | } |
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| 119 | |
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| 120 | ~ScopeGuardImpl0() throw() |
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| 121 | { |
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| 122 | SafeExecute(*this); |
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| 123 | } |
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| 124 | |
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| 125 | void Execute() |
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| 126 | { |
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| 127 | fun_(); |
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| 128 | } |
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| 129 | |
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| 130 | ScopeGuardImpl0(F fun) : fun_(fun) |
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| 131 | {} |
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| 132 | |
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| 133 | protected: |
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| 134 | F fun_; |
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| 135 | }; |
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| 136 | |
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| 137 | template <typename F> |
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| 138 | inline ScopeGuardImpl0<F> MakeGuard(F fun) |
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| 139 | { |
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| 140 | return ScopeGuardImpl0<F>::MakeGuard(fun); |
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| 141 | } |
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| 142 | |
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| 143 | //////////////////////////////////////////////////////////////// |
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| 144 | /// |
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| 145 | /// \class ScopeGuardImpl1 |
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| 146 | /// \ingroup ExceptionGroup |
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| 147 | /// |
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| 148 | /// Implementation class for a standalone function or class static function |
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| 149 | /// with one parameter. Each parameter is copied by value - use |
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| 150 | /// ::Loki::ByRef if you must use a reference instead. ScopeGuard ignores |
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| 151 | /// any value returned from the call within the Execute function. |
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| 152 | /// |
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| 153 | /// This class has a single standalone helper function, MakeGuard which |
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| 154 | /// creates and returns a ScopeGuard. |
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| 155 | /// |
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| 156 | //////////////////////////////////////////////////////////////// |
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| 157 | |
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| 158 | template <typename F, typename P1> |
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| 159 | class ScopeGuardImpl1 : public ScopeGuardImplBase |
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| 160 | { |
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| 161 | public: |
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| 162 | static ScopeGuardImpl1<F, P1> MakeGuard(F fun, P1 p1) |
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| 163 | { |
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| 164 | return ScopeGuardImpl1<F, P1>(fun, p1); |
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| 165 | } |
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| 166 | |
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| 167 | ~ScopeGuardImpl1() throw() |
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| 168 | { |
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| 169 | SafeExecute(*this); |
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| 170 | } |
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| 171 | |
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| 172 | void Execute() |
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| 173 | { |
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| 174 | fun_(p1_); |
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| 175 | } |
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| 176 | |
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| 177 | ScopeGuardImpl1(F fun, P1 p1) : fun_(fun), p1_(p1) |
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| 178 | {} |
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| 179 | |
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| 180 | protected: |
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| 181 | F fun_; |
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| 182 | const P1 p1_; |
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| 183 | }; |
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| 184 | |
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| 185 | template <typename F, typename P1> |
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| 186 | inline ScopeGuardImpl1<F, P1> MakeGuard(F fun, P1 p1) |
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| 187 | { |
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| 188 | return ScopeGuardImpl1<F, P1>::MakeGuard(fun, p1); |
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| 189 | } |
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| 190 | |
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| 191 | //////////////////////////////////////////////////////////////// |
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| 192 | /// |
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| 193 | /// \class ScopeGuardImpl2 |
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| 194 | /// \ingroup ExceptionGroup |
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| 195 | /// |
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| 196 | /// Implementation class for a standalone function or class static function |
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| 197 | /// with two parameters. Each parameter is copied by value - use |
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| 198 | /// ::Loki::ByRef if you must use a reference instead. ScopeGuard ignores |
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| 199 | /// any value returned from the call within the Execute function. |
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| 200 | /// |
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| 201 | /// This class has a single standalone helper function, MakeGuard which |
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| 202 | /// creates and returns a ScopeGuard. |
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| 203 | /// |
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| 204 | //////////////////////////////////////////////////////////////// |
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| 205 | |
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| 206 | template <typename F, typename P1, typename P2> |
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| 207 | class ScopeGuardImpl2: public ScopeGuardImplBase |
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| 208 | { |
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| 209 | public: |
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| 210 | static ScopeGuardImpl2<F, P1, P2> MakeGuard(F fun, P1 p1, P2 p2) |
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| 211 | { |
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| 212 | return ScopeGuardImpl2<F, P1, P2>(fun, p1, p2); |
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| 213 | } |
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| 214 | |
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| 215 | ~ScopeGuardImpl2() throw() |
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| 216 | { |
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| 217 | SafeExecute(*this); |
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| 218 | } |
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| 219 | |
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| 220 | void Execute() |
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| 221 | { |
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| 222 | fun_(p1_, p2_); |
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| 223 | } |
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| 224 | |
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| 225 | ScopeGuardImpl2(F fun, P1 p1, P2 p2) : fun_(fun), p1_(p1), p2_(p2) |
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| 226 | {} |
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| 227 | |
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| 228 | protected: |
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| 229 | F fun_; |
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| 230 | const P1 p1_; |
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| 231 | const P2 p2_; |
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| 232 | }; |
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| 233 | |
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| 234 | template <typename F, typename P1, typename P2> |
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| 235 | inline ScopeGuardImpl2<F, P1, P2> MakeGuard(F fun, P1 p1, P2 p2) |
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| 236 | { |
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| 237 | return ScopeGuardImpl2<F, P1, P2>::MakeGuard(fun, p1, p2); |
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| 238 | } |
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| 239 | |
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| 240 | //////////////////////////////////////////////////////////////// |
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| 241 | /// |
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| 242 | /// \class ScopeGuardImpl3 |
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| 243 | /// \ingroup ExceptionGroup |
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| 244 | /// |
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| 245 | /// Implementation class for a standalone function or class static function |
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| 246 | /// with three parameters. Each parameter is copied by value - use |
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| 247 | /// ::Loki::ByRef if you must use a reference instead. ScopeGuard ignores |
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| 248 | /// any value returned from the call within the Execute function. |
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| 249 | /// |
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| 250 | /// This class has a single standalone helper function, MakeGuard which |
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| 251 | /// creates and returns a ScopeGuard. |
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| 252 | /// |
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| 253 | //////////////////////////////////////////////////////////////// |
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| 254 | |
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| 255 | template <typename F, typename P1, typename P2, typename P3> |
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| 256 | class ScopeGuardImpl3 : public ScopeGuardImplBase |
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| 257 | { |
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| 258 | public: |
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| 259 | static ScopeGuardImpl3<F, P1, P2, P3> MakeGuard(F fun, P1 p1, P2 p2, P3 p3) |
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| 260 | { |
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| 261 | return ScopeGuardImpl3<F, P1, P2, P3>(fun, p1, p2, p3); |
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| 262 | } |
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| 263 | |
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| 264 | ~ScopeGuardImpl3() throw() |
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| 265 | { |
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| 266 | SafeExecute(*this); |
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| 267 | } |
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| 268 | |
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| 269 | void Execute() |
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| 270 | { |
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| 271 | fun_(p1_, p2_, p3_); |
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| 272 | } |
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| 273 | |
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| 274 | ScopeGuardImpl3(F fun, P1 p1, P2 p2, P3 p3) : fun_(fun), p1_(p1), p2_(p2), p3_(p3) |
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| 275 | {} |
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| 276 | |
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| 277 | protected: |
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| 278 | F fun_; |
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| 279 | const P1 p1_; |
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| 280 | const P2 p2_; |
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| 281 | const P3 p3_; |
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| 282 | }; |
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| 283 | |
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| 284 | template <typename F, typename P1, typename P2, typename P3> |
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| 285 | inline ScopeGuardImpl3<F, P1, P2, P3> MakeGuard(F fun, P1 p1, P2 p2, P3 p3) |
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| 286 | { |
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| 287 | return ScopeGuardImpl3<F, P1, P2, P3>::MakeGuard(fun, p1, p2, p3); |
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| 288 | } |
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| 289 | |
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| 290 | //////////////////////////////////////////////////////////////// |
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| 291 | /// |
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| 292 | /// \class ScopeGuardImpl4 |
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| 293 | /// \ingroup ExceptionGroup |
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| 294 | /// |
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| 295 | /// Implementation class for a standalone function or class static function |
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| 296 | /// with four parameters. Each parameter is copied by value - use |
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| 297 | /// ::Loki::ByRef if you must use a reference instead. ScopeGuard ignores |
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| 298 | /// any value returned from the call within the Execute function. |
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| 299 | /// |
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| 300 | /// This class has a single standalone helper function, MakeGuard which |
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| 301 | /// creates and returns a ScopeGuard. |
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| 302 | /// |
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| 303 | //////////////////////////////////////////////////////////////// |
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| 304 | |
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| 305 | template < typename F, typename P1, typename P2, typename P3, typename P4 > |
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| 306 | class ScopeGuardImpl4 : public ScopeGuardImplBase |
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| 307 | { |
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| 308 | public: |
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| 309 | static ScopeGuardImpl4< F, P1, P2, P3, P4 > MakeGuard( |
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| 310 | F fun, P1 p1, P2 p2, P3 p3, P4 p4 ) |
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| 311 | { |
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| 312 | return ScopeGuardImpl4< F, P1, P2, P3, P4 >( fun, p1, p2, p3, p4 ); |
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| 313 | } |
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| 314 | |
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| 315 | ~ScopeGuardImpl4() throw() |
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| 316 | { |
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| 317 | SafeExecute( *this ); |
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| 318 | } |
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| 319 | |
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| 320 | void Execute() |
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| 321 | { |
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| 322 | fun_( p1_, p2_, p3_, p4_ ); |
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| 323 | } |
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| 324 | |
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| 325 | ScopeGuardImpl4( F fun, P1 p1, P2 p2, P3 p3, P4 p4 ) : |
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| 326 | fun_( fun ), p1_( p1 ), p2_( p2 ), p3_( p3 ), p4_( p4 ) |
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| 327 | {} |
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| 328 | |
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| 329 | protected: |
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| 330 | F fun_; |
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| 331 | const P1 p1_; |
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| 332 | const P2 p2_; |
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| 333 | const P3 p3_; |
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| 334 | const P4 p4_; |
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| 335 | }; |
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| 336 | |
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| 337 | template < typename F, typename P1, typename P2, typename P3, typename P4 > |
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| 338 | inline ScopeGuardImpl4< F, P1, P2, P3, P4 > MakeGuard( F fun, P1 p1, P2 p2, P3 p3, P4 p4 ) |
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| 339 | { |
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| 340 | return ScopeGuardImpl4< F, P1, P2, P3, P4 >::MakeGuard( fun, p1, p2, p3, p4 ); |
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| 341 | } |
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| 342 | |
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| 343 | //////////////////////////////////////////////////////////////// |
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| 344 | /// |
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| 345 | /// \class ScopeGuardImpl5 |
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| 346 | /// \ingroup ExceptionGroup |
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| 347 | /// |
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| 348 | /// Implementation class for a standalone function or class static function |
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| 349 | /// with five parameters. Each parameter is copied by value - use |
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| 350 | /// ::Loki::ByRef if you must use a reference instead. ScopeGuard ignores |
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| 351 | /// any value returned from the call within the Execute function. |
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| 352 | /// |
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| 353 | /// This class has a single standalone helper function, MakeGuard which |
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| 354 | /// creates and returns a ScopeGuard. |
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| 355 | /// |
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| 356 | //////////////////////////////////////////////////////////////// |
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| 357 | |
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| 358 | template < typename F, typename P1, typename P2, typename P3, typename P4, typename P5 > |
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| 359 | class ScopeGuardImpl5 : public ScopeGuardImplBase |
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| 360 | { |
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| 361 | public: |
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| 362 | static ScopeGuardImpl5< F, P1, P2, P3, P4, P5 > MakeGuard( |
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| 363 | F fun, P1 p1, P2 p2, P3 p3, P4 p4, P5 p5 ) |
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| 364 | { |
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| 365 | return ScopeGuardImpl5< F, P1, P2, P3, P4, P5 >( fun, p1, p2, p3, p4, p5 ); |
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| 366 | } |
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| 367 | |
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| 368 | ~ScopeGuardImpl5() throw() |
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| 369 | { |
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| 370 | SafeExecute( *this ); |
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| 371 | } |
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| 372 | |
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| 373 | void Execute() |
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| 374 | { |
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| 375 | fun_( p1_, p2_, p3_, p4_, p5_ ); |
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| 376 | } |
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| 377 | |
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| 378 | ScopeGuardImpl5( F fun, P1 p1, P2 p2, P3 p3, P4 p4, P5 p5 ) : |
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| 379 | fun_( fun ), p1_( p1 ), p2_( p2 ), p3_( p3 ), p4_( p4 ), p5_( p5 ) |
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| 380 | {} |
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| 381 | |
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| 382 | protected: |
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| 383 | F fun_; |
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| 384 | const P1 p1_; |
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| 385 | const P2 p2_; |
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| 386 | const P3 p3_; |
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| 387 | const P4 p4_; |
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| 388 | const P5 p5_; |
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| 389 | }; |
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| 390 | |
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| 391 | template < typename F, typename P1, typename P2, typename P3, typename P4, typename P5 > |
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| 392 | inline ScopeGuardImpl5< F, P1, P2, P3, P4, P5 > MakeGuard( F fun, P1 p1, P2 p2, P3 p3, P4 p4, P5 p5 ) |
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| 393 | { |
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| 394 | return ScopeGuardImpl5< F, P1, P2, P3, P4, P5 >::MakeGuard( fun, p1, p2, p3, p4, p5 ); |
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| 395 | } |
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| 396 | |
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| 397 | //////////////////////////////////////////////////////////////// |
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| 398 | /// |
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| 399 | /// \class ObjScopeGuardImpl0 |
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| 400 | /// \ingroup ExceptionGroup |
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| 401 | /// |
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| 402 | /// Implementation class for a class per-instance member function with no |
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| 403 | /// parameters. ScopeGuard ignores any value returned from the call within |
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| 404 | /// the Execute function. |
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| 405 | /// |
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| 406 | /// This class has 3 standalone helper functions which create a ScopeGuard. |
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| 407 | /// One is MakeObjGuard, which is deprecated but provided for older code. |
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| 408 | /// The other two are MakeGuard overloads, one which takes a pointer to an |
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| 409 | /// object, and the other which takes a reference. |
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| 410 | /// |
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| 411 | //////////////////////////////////////////////////////////////// |
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| 412 | |
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| 413 | template <class Obj, typename MemFun> |
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| 414 | class ObjScopeGuardImpl0 : public ScopeGuardImplBase |
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| 415 | { |
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| 416 | public: |
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| 417 | static ObjScopeGuardImpl0<Obj, MemFun> MakeObjGuard(Obj& obj, MemFun memFun) |
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| 418 | { |
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| 419 | return ObjScopeGuardImpl0<Obj, MemFun>(obj, memFun); |
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| 420 | } |
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| 421 | |
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| 422 | ~ObjScopeGuardImpl0() throw() |
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| 423 | { |
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| 424 | SafeExecute(*this); |
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| 425 | } |
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| 426 | |
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| 427 | void Execute() |
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| 428 | { |
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| 429 | (obj_.*memFun_)(); |
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| 430 | } |
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| 431 | |
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| 432 | ObjScopeGuardImpl0(Obj& obj, MemFun memFun) : obj_(obj), memFun_(memFun) |
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| 433 | {} |
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| 434 | |
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| 435 | protected: |
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| 436 | Obj& obj_; |
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| 437 | MemFun memFun_; |
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| 438 | }; |
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| 439 | |
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| 440 | template <class Obj, typename MemFun> |
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| 441 | inline ObjScopeGuardImpl0<Obj, MemFun> MakeObjGuard(Obj& obj, MemFun memFun) |
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| 442 | { |
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| 443 | return ObjScopeGuardImpl0<Obj, MemFun>::MakeObjGuard(obj, memFun); |
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| 444 | } |
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| 445 | |
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| 446 | template <typename Ret, class Obj1, class Obj2> |
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| 447 | inline ObjScopeGuardImpl0<Obj1,Ret(Obj2::*)()> MakeGuard(Ret(Obj2::*memFun)(), Obj1 &obj) |
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| 448 | { |
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| 449 | return ObjScopeGuardImpl0<Obj1,Ret(Obj2::*)()>::MakeObjGuard(obj,memFun); |
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| 450 | } |
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| 451 | |
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| 452 | template <typename Ret, class Obj1, class Obj2> |
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| 453 | inline ObjScopeGuardImpl0<Obj1,Ret(Obj2::*)()> MakeGuard(Ret(Obj2::*memFun)(), Obj1 *obj) |
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| 454 | { |
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| 455 | return ObjScopeGuardImpl0<Obj1,Ret(Obj2::*)()>::MakeObjGuard(*obj,memFun); |
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| 456 | } |
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| 457 | |
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| 458 | //////////////////////////////////////////////////////////////// |
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| 459 | /// |
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| 460 | /// \class ObjScopeGuardImpl1 |
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| 461 | /// \ingroup ExceptionGroup |
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| 462 | /// |
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| 463 | /// Implementation class for a class per-instance member function with one |
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| 464 | /// parameter. The parameter is copied by value - use ::Loki::ByRef if you |
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| 465 | /// must use a reference instead. ScopeGuard ignores any value returned |
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| 466 | /// from the call within the Execute function. |
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| 467 | /// |
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| 468 | /// This class has 3 standalone helper functions which create a ScopeGuard. |
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| 469 | /// One is MakeObjGuard, which is deprecated but provided for older code. |
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| 470 | /// The other two are MakeGuard overloads, one which takes a pointer to an |
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| 471 | /// object, and the other which takes a reference. |
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| 472 | /// |
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| 473 | //////////////////////////////////////////////////////////////// |
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| 474 | |
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| 475 | template <class Obj, typename MemFun, typename P1> |
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| 476 | class ObjScopeGuardImpl1 : public ScopeGuardImplBase |
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| 477 | { |
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| 478 | public: |
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| 479 | static ObjScopeGuardImpl1<Obj, MemFun, P1> MakeObjGuard(Obj& obj, MemFun memFun, P1 p1) |
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| 480 | { |
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| 481 | return ObjScopeGuardImpl1<Obj, MemFun, P1>(obj, memFun, p1); |
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| 482 | } |
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| 483 | |
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| 484 | ~ObjScopeGuardImpl1() throw() |
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| 485 | { |
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| 486 | SafeExecute(*this); |
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| 487 | } |
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| 488 | |
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| 489 | void Execute() |
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| 490 | { |
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| 491 | (obj_.*memFun_)(p1_); |
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| 492 | } |
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| 493 | |
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| 494 | ObjScopeGuardImpl1(Obj& obj, MemFun memFun, P1 p1) : obj_(obj), memFun_(memFun), p1_(p1) |
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| 495 | {} |
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| 496 | |
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| 497 | protected: |
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| 498 | Obj& obj_; |
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| 499 | MemFun memFun_; |
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| 500 | const P1 p1_; |
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| 501 | }; |
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| 502 | |
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| 503 | template <class Obj, typename MemFun, typename P1> |
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| 504 | inline ObjScopeGuardImpl1<Obj, MemFun, P1> MakeObjGuard(Obj& obj, MemFun memFun, P1 p1) |
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| 505 | { |
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| 506 | return ObjScopeGuardImpl1<Obj, MemFun, P1>::MakeObjGuard(obj, memFun, p1); |
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| 507 | } |
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| 508 | |
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| 509 | template <typename Ret, class Obj1, class Obj2, typename P1a, typename P1b> |
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| 510 | inline ObjScopeGuardImpl1<Obj1,Ret(Obj2::*)(P1a),P1b> MakeGuard(Ret(Obj2::*memFun)(P1a), Obj1 &obj, P1b p1) |
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| 511 | { |
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| 512 | return ObjScopeGuardImpl1<Obj1,Ret(Obj2::*)(P1a),P1b>::MakeObjGuard(obj,memFun,p1); |
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| 513 | } |
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| 514 | |
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| 515 | template <typename Ret, class Obj1, class Obj2, typename P1a, typename P1b> |
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| 516 | inline ObjScopeGuardImpl1<Obj1,Ret(Obj2::*)(P1a),P1b> MakeGuard(Ret(Obj2::*memFun)(P1a), Obj1 *obj, P1b p1) |
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| 517 | { |
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| 518 | return ObjScopeGuardImpl1<Obj1,Ret(Obj2::*)(P1a),P1b>::MakeObjGuard(*obj,memFun,p1); |
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| 519 | } |
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| 520 | |
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| 521 | //////////////////////////////////////////////////////////////// |
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| 522 | /// |
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| 523 | /// \class ObjScopeGuardImpl2 |
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| 524 | /// \ingroup ExceptionGroup |
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| 525 | /// |
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| 526 | /// Implementation class for a class per-instance member function with two |
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| 527 | /// parameters. Each parameter is copied by value - use ::Loki::ByRef if you |
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| 528 | /// must use a reference instead. ScopeGuard ignores any value returned |
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| 529 | /// from the call within the Execute function. |
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| 530 | /// |
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| 531 | /// This class has 3 standalone helper functions which create a ScopeGuard. |
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| 532 | /// One is MakeObjGuard, which is deprecated but provided for older code. |
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| 533 | /// The other two are MakeGuard overloads, one which takes a pointer to an |
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| 534 | /// object, and the other which takes a reference. |
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| 535 | /// |
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| 536 | //////////////////////////////////////////////////////////////// |
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| 537 | |
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| 538 | template <class Obj, typename MemFun, typename P1, typename P2> |
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| 539 | class ObjScopeGuardImpl2 : public ScopeGuardImplBase |
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| 540 | { |
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| 541 | public: |
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| 542 | static ObjScopeGuardImpl2<Obj, MemFun, P1, P2> MakeObjGuard(Obj& obj, MemFun memFun, P1 p1, P2 p2) |
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| 543 | { |
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| 544 | return ObjScopeGuardImpl2<Obj, MemFun, P1, P2>(obj, memFun, p1, p2); |
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| 545 | } |
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| 546 | |
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| 547 | ~ObjScopeGuardImpl2() throw() |
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| 548 | { |
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| 549 | SafeExecute(*this); |
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| 550 | } |
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| 551 | |
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| 552 | void Execute() |
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| 553 | { |
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| 554 | (obj_.*memFun_)(p1_, p2_); |
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| 555 | } |
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| 556 | |
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| 557 | ObjScopeGuardImpl2(Obj& obj, MemFun memFun, P1 p1, P2 p2) : obj_(obj), memFun_(memFun), p1_(p1), p2_(p2) |
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| 558 | {} |
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| 559 | |
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| 560 | protected: |
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| 561 | Obj& obj_; |
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| 562 | MemFun memFun_; |
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| 563 | const P1 p1_; |
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| 564 | const P2 p2_; |
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| 565 | }; |
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| 566 | |
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| 567 | template <class Obj, typename MemFun, typename P1, typename P2> |
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| 568 | inline ObjScopeGuardImpl2<Obj, MemFun, P1, P2> MakeObjGuard(Obj& obj, MemFun memFun, P1 p1, P2 p2) |
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| 569 | { |
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| 570 | return ObjScopeGuardImpl2<Obj, MemFun, P1, P2>::MakeObjGuard(obj, memFun, p1, p2); |
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| 571 | } |
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| 572 | |
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| 573 | template <typename Ret, class Obj1, class Obj2, typename P1a, typename P1b, typename P2a, typename P2b> |
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| 574 | inline ObjScopeGuardImpl2<Obj1,Ret(Obj2::*)(P1a,P2a),P1b,P2b> MakeGuard(Ret(Obj2::*memFun)(P1a,P2a), Obj1 &obj, P1b p1, P2b p2) |
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| 575 | { |
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| 576 | return ObjScopeGuardImpl2<Obj1,Ret(Obj2::*)(P1a,P2a),P1b,P2b>::MakeObjGuard(obj,memFun,p1,p2); |
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| 577 | } |
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| 578 | |
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| 579 | template <typename Ret, class Obj1, class Obj2, typename P1a, typename P1b, typename P2a, typename P2b> |
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| 580 | inline ObjScopeGuardImpl2<Obj1,Ret(Obj2::*)(P1a,P2a),P1b,P2b> MakeGuard(Ret(Obj2::*memFun)(P1a,P2a), Obj1 *obj, P1b p1, P2b p2) |
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| 581 | { |
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| 582 | return ObjScopeGuardImpl2<Obj1,Ret(Obj2::*)(P1a,P2a),P1b,P2b>::MakeObjGuard(*obj,memFun,p1,p2); |
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| 583 | } |
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| 584 | |
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| 585 | //////////////////////////////////////////////////////////////// |
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| 586 | /// |
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| 587 | /// \class ObjScopeGuardImpl3 |
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| 588 | /// \ingroup ExceptionGroup |
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| 589 | /// |
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| 590 | /// Implementation class for a class per-instance member function with three |
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| 591 | /// parameters. Each parameter is copied by value - use ::Loki::ByRef if you |
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| 592 | /// must use a reference instead. ScopeGuard ignores any value returned |
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| 593 | /// from the call within the Execute function. |
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| 594 | /// |
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| 595 | /// This class has 3 standalone helper functions which create a ScopeGuard. |
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| 596 | /// One is MakeObjGuard, which is deprecated but provided for older code. |
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| 597 | /// The other two are MakeGuard overloads, one which takes a pointer to an |
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| 598 | /// object, and the other which takes a reference. |
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| 599 | /// |
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| 600 | //////////////////////////////////////////////////////////////// |
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| 601 | |
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| 602 | template < class Obj, typename MemFun, typename P1, typename P2, typename P3 > |
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| 603 | class ObjScopeGuardImpl3 : public ScopeGuardImplBase |
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| 604 | { |
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| 605 | public: |
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| 606 | static ObjScopeGuardImpl3< Obj, MemFun, P1, P2, P3 > MakeObjGuard( |
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| 607 | Obj & obj, MemFun memFun, P1 p1, P2 p2, P3 p3 ) |
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| 608 | { |
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| 609 | return ObjScopeGuardImpl3< Obj, MemFun, P1, P2, P3 >( obj, memFun, p1, p2, p3 ); |
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| 610 | } |
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| 611 | |
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| 612 | ~ObjScopeGuardImpl3() throw() |
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| 613 | { |
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| 614 | SafeExecute( *this ); |
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| 615 | } |
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| 616 | |
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| 617 | void Execute() |
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| 618 | { |
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| 619 | ( obj_.*memFun_ )( p1_, p2_, p3_ ); |
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| 620 | } |
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| 621 | |
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| 622 | ObjScopeGuardImpl3( Obj & obj, MemFun memFun, P1 p1, P2 p2, P3 p3 ) : |
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| 623 | obj_( obj ), memFun_( memFun ), p1_( p1 ), p2_( p2 ), p3_( p3 ) |
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| 624 | {} |
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| 625 | |
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| 626 | protected: |
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| 627 | Obj& obj_; |
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| 628 | MemFun memFun_; |
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| 629 | const P1 p1_; |
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| 630 | const P2 p2_; |
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| 631 | const P3 p3_; |
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| 632 | }; |
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| 633 | |
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| 634 | template < class Obj, typename MemFun, typename P1, typename P2, typename P3 > |
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| 635 | inline ObjScopeGuardImpl3< Obj, MemFun, P1, P2, P3 > MakeObjGuard( |
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| 636 | Obj & obj, MemFun memFun, P1 p1, P2 p2, P3 p3 ) |
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| 637 | { |
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| 638 | return ObjScopeGuardImpl3< Obj, MemFun, P1, P2, P3 >::MakeObjGuard( |
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| 639 | obj, memFun, p1, p2, p3 ); |
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| 640 | } |
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| 641 | |
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| 642 | template < typename Ret, class Obj1, class Obj2, typename P1a, typename P1b, |
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| 643 | typename P2a, typename P2b, typename P3a, typename P3b > |
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| 644 | inline ObjScopeGuardImpl3< Obj1, Ret( Obj2::* )( P1a, P2a, P3a ), P1b, P2b, P3b > |
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| 645 | MakeGuard( Ret( Obj2::*memFun )( P1a, P2a, P3a ), Obj1 & obj, P1b p1, P2b p2, P3b p3 ) |
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| 646 | { |
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| 647 | return ObjScopeGuardImpl3< Obj1, Ret( Obj2::* )( P1a, P2a, P3a ), P1b, P2b, P3b > |
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| 648 | ::MakeObjGuard( obj, memFun, p1, p2, p3 ); |
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| 649 | } |
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| 650 | |
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| 651 | template < typename Ret, class Obj1, class Obj2, typename P1a, typename P1b, |
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| 652 | typename P2a, typename P2b, typename P3a, typename P3b > |
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| 653 | inline ObjScopeGuardImpl3< Obj1, Ret( Obj2::* )( P1a, P2a, P3a ), P1b, P2b, P3b > |
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| 654 | MakeGuard( Ret( Obj2::*memFun )( P1a, P2a, P3a ), Obj1 * obj, P1b p1, P2b p2, P3b p3 ) |
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| 655 | { |
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| 656 | return ObjScopeGuardImpl3< Obj1, Ret( Obj2::* )( P1a, P2a, P3a ), P1b, P2b, P3b > |
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| 657 | ::MakeObjGuard( *obj, memFun, p1, p2, p3 ); |
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| 658 | } |
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| 659 | |
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| 660 | } // namespace Loki |
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| 661 | |
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| 662 | #define LOKI_CONCATENATE_DIRECT(s1, s2) s1##s2 |
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| 663 | #define LOKI_CONCATENATE(s1, s2) LOKI_CONCATENATE_DIRECT(s1, s2) |
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| 664 | #define LOKI_ANONYMOUS_VARIABLE(str) LOKI_CONCATENATE(str, __LINE__) |
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| 665 | |
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| 666 | #define LOKI_ON_BLOCK_EXIT ::Loki::ScopeGuard LOKI_ANONYMOUS_VARIABLE(scopeGuard) = ::Loki::MakeGuard |
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| 667 | #define LOKI_ON_BLOCK_EXIT_OBJ ::Loki::ScopeGuard LOKI_ANONYMOUS_VARIABLE(scopeGuard) = ::Loki::MakeObjGuard |
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| 668 | |
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| 669 | #endif // end file guardian |
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| 670 | |
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