[857] | 1 | /* Copyright 2003-2005 Joaquín M López Muñoz.
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| 2 | * Distributed under the Boost Software License, Version 1.0.
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| 3 | * (See accompanying file LICENSE_1_0.txt or copy at
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| 4 | * http://www.boost.org/LICENSE_1_0.txt)
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| 5 | *
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| 6 | * See http://www.boost.org/libs/multi_index for library home page.
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| 7 | */
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| 8 |
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| 9 | #ifndef BOOST_MULTI_INDEX_DETAIL_SCOPE_GUARD_HPP
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| 10 | #define BOOST_MULTI_INDEX_DETAIL_SCOPE_GUARD_HPP
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| 11 |
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| 12 | #if defined(_MSC_VER)&&(_MSC_VER>=1200)
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| 13 | #pragma once
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| 14 | #endif
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| 15 |
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| 16 | namespace boost{
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| 17 |
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| 18 | namespace multi_index{
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| 19 |
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| 20 | namespace detail{
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| 21 |
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| 22 | /* Until some official version of the ScopeGuard idiom makes it into Boost,
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| 23 | * we locally define our own. This is a merely reformated version of
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| 24 | * ScopeGuard.h as defined in:
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| 25 | * Alexandrescu, A., Marginean, P.:"Generic<Programming>: Change the Way You
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| 26 | * Write Exception-Safe Code - Forever", C/C++ Users Jornal, Dec 2000,
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| 27 | * http://www.cuj.com/documents/s=8000/cujcexp1812alexandr/
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| 28 | * with the following modifications:
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| 29 | * - General pretty formatting (pretty to my taste at least.)
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| 30 | * - Naming style changed to standard C++ library requirements.
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| 31 | * - safe_execute does not feature a try-catch protection, so we can
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| 32 | * use this even if BOOST_NO_EXCEPTIONS is defined.
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| 33 | * - Added scope_guard_impl4 and obj_scope_guard_impl3, (Boost.MultiIndex
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| 34 | * needs them). A better design would provide guards for many more
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| 35 | * arguments through the Boost Preprocessor Library.
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| 36 | * - Added scope_guard_impl_base::touch (see below.)
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| 37 | * - Removed RefHolder and ByRef, whose functionality is provided
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| 38 | * already by Boost.Ref.
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| 39 | * - Removed static make_guard's and make_obj_guard's, so that the code
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| 40 | * will work even if BOOST_NO_MEMBER_TEMPLATES is defined. This forces
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| 41 | * us to move some private ctors to public, though.
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| 42 | *
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| 43 | * NB: CodeWarrior Pro 8 seems to have problems looking up safe_execute
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| 44 | * without an explicit qualification.
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| 45 | */
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| 46 |
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| 47 | class scope_guard_impl_base
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| 48 | {
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| 49 | public:
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| 50 | scope_guard_impl_base():dismissed_(false){}
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| 51 | void dismiss()const{dismissed_=true;}
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| 52 |
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| 53 | /* This helps prevent some "unused variable" warnings under, for instance,
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| 54 | * GCC 3.2.
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| 55 | */
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| 56 | void touch()const{}
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| 57 |
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| 58 | protected:
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| 59 | ~scope_guard_impl_base(){}
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| 60 |
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| 61 | scope_guard_impl_base(const scope_guard_impl_base& other):
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| 62 | dismissed_(other.dismissed_)
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| 63 | {
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| 64 | other.dismiss();
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| 65 | }
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| 66 |
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| 67 | template<typename J>
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| 68 | static void safe_execute(J& j){if(!j.dismissed_)j.execute();}
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| 69 |
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| 70 | mutable bool dismissed_;
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| 71 |
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| 72 | private:
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| 73 | scope_guard_impl_base& operator=(const scope_guard_impl_base&);
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| 74 | };
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| 75 |
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| 76 | typedef const scope_guard_impl_base& scope_guard;
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| 77 |
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| 78 | template<typename F>
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| 79 | class scope_guard_impl0:public scope_guard_impl_base
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| 80 | {
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| 81 | public:
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| 82 | scope_guard_impl0(F fun):fun_(fun){}
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| 83 | ~scope_guard_impl0(){scope_guard_impl_base::safe_execute(*this);}
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| 84 | void execute(){fun_();}
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| 85 |
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| 86 | protected:
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| 87 |
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| 88 | F fun_;
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| 89 | };
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| 90 |
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| 91 | template<typename F>
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| 92 | inline scope_guard_impl0<F> make_guard(F fun)
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| 93 | {
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| 94 | return scope_guard_impl0<F>(fun);
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| 95 | }
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| 96 |
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| 97 | template<typename F,typename P1>
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| 98 | class scope_guard_impl1:public scope_guard_impl_base
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| 99 | {
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| 100 | public:
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| 101 | scope_guard_impl1(F fun,P1 p1):fun_(fun),p1_(p1){}
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| 102 | ~scope_guard_impl1(){scope_guard_impl_base::safe_execute(*this);}
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| 103 | void execute(){fun_(p1_);}
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| 104 |
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| 105 | protected:
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| 106 | F fun_;
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| 107 | const P1 p1_;
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| 108 | };
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| 109 |
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| 110 | template<typename F,typename P1>
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| 111 | inline scope_guard_impl1<F,P1> make_guard(F fun,P1 p1)
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| 112 | {
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| 113 | return scope_guard_impl1<F,P1>(fun,p1);
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| 114 | }
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| 115 |
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| 116 | template<typename F,typename P1,typename P2>
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| 117 | class scope_guard_impl2:public scope_guard_impl_base
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| 118 | {
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| 119 | public:
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| 120 | scope_guard_impl2(F fun,P1 p1,P2 p2):fun_(fun),p1_(p1),p2_(p2){}
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| 121 | ~scope_guard_impl2(){scope_guard_impl_base::safe_execute(*this);}
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| 122 | void execute(){fun_(p1_,p2_);}
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| 123 |
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| 124 | protected:
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| 125 | F fun_;
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| 126 | const P1 p1_;
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| 127 | const P2 p2_;
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| 128 | };
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| 129 |
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| 130 | template<typename F,typename P1,typename P2>
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| 131 | inline scope_guard_impl2<F,P1,P2> make_guard(F fun,P1 p1,P2 p2)
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| 132 | {
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| 133 | return scope_guard_impl2<F,P1,P2>(fun,p1,p2);
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| 134 | }
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| 135 |
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| 136 | template<typename F,typename P1,typename P2,typename P3>
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| 137 | class scope_guard_impl3:public scope_guard_impl_base
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| 138 | {
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| 139 | public:
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| 140 | scope_guard_impl3(F fun,P1 p1,P2 p2,P3 p3):fun_(fun),p1_(p1),p2_(p2),p3_(p3){}
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| 141 | ~scope_guard_impl3(){scope_guard_impl_base::safe_execute(*this);}
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| 142 | void execute(){fun_(p1_,p2_,p3_);}
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| 143 |
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| 144 | protected:
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| 145 | F fun_;
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| 146 | const P1 p1_;
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| 147 | const P2 p2_;
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| 148 | const P3 p3_;
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| 149 | };
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| 150 |
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| 151 | template<typename F,typename P1,typename P2,typename P3>
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| 152 | inline scope_guard_impl3<F,P1,P2,P3> make_guard(F fun,P1 p1,P2 p2,P3 p3)
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| 153 | {
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| 154 | return scope_guard_impl3<F,P1,P2,P3>(fun,p1,p2,p3);
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| 155 | }
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| 156 |
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| 157 | template<typename F,typename P1,typename P2,typename P3,typename P4>
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| 158 | class scope_guard_impl4:public scope_guard_impl_base
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| 159 | {
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| 160 | public:
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| 161 | scope_guard_impl4(F fun,P1 p1,P2 p2,P3 p3,P4 p4):
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| 162 | fun_(fun),p1_(p1),p2_(p2),p3_(p3),p4_(p4){}
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| 163 | ~scope_guard_impl4(){scope_guard_impl_base::safe_execute(*this);}
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| 164 | void execute(){fun_(p1_,p2_,p3_,p4_);}
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| 165 |
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| 166 | protected:
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| 167 | F fun_;
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| 168 | const P1 p1_;
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| 169 | const P2 p2_;
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| 170 | const P3 p3_;
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| 171 | const P4 p4_;
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| 172 | };
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| 173 |
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| 174 | template<typename F,typename P1,typename P2,typename P3,typename P4>
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| 175 | inline scope_guard_impl4<F,P1,P2,P3,P4> make_guard(
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| 176 | F fun,P1 p1,P2 p2,P3 p3,P4 p4)
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| 177 | {
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| 178 | return scope_guard_impl4<F,P1,P2,P3,P4>(fun,p1,p2,p3,p4);
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| 179 | }
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| 180 |
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| 181 | template<class Obj,typename MemFun>
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| 182 | class obj_scope_guard_impl0:public scope_guard_impl_base
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| 183 | {
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| 184 | public:
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| 185 | obj_scope_guard_impl0(Obj& obj,MemFun mem_fun):obj_(obj),mem_fun_(mem_fun){}
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| 186 | ~obj_scope_guard_impl0(){scope_guard_impl_base::safe_execute(*this);}
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| 187 | void execute(){(obj_.*mem_fun_)();}
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| 188 |
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| 189 | protected:
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| 190 | Obj& obj_;
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| 191 | MemFun mem_fun_;
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| 192 | };
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| 193 |
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| 194 | template<class Obj,typename MemFun>
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| 195 | inline obj_scope_guard_impl0<Obj,MemFun> make_obj_guard(Obj& obj,MemFun mem_fun)
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| 196 | {
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| 197 | return obj_scope_guard_impl0<Obj,MemFun>(obj,mem_fun);
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| 198 | }
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| 199 |
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| 200 | template<class Obj,typename MemFun,typename P1>
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| 201 | class obj_scope_guard_impl1:public scope_guard_impl_base
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| 202 | {
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| 203 | public:
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| 204 | obj_scope_guard_impl1(Obj& obj,MemFun mem_fun,P1 p1):
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| 205 | obj_(obj),mem_fun_(mem_fun),p1_(p1){}
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| 206 | ~obj_scope_guard_impl1(){scope_guard_impl_base::safe_execute(*this);}
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| 207 | void execute(){(obj_.*mem_fun_)(p1_);}
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| 208 |
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| 209 | protected:
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| 210 | Obj& obj_;
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| 211 | MemFun mem_fun_;
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| 212 | const P1 p1_;
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| 213 | };
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| 214 |
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| 215 | template<class Obj,typename MemFun,typename P1>
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| 216 | inline obj_scope_guard_impl1<Obj,MemFun,P1> make_obj_guard(
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| 217 | Obj& obj,MemFun mem_fun,P1 p1)
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| 218 | {
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| 219 | return obj_scope_guard_impl1<Obj,MemFun,P1>(obj,mem_fun,p1);
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| 220 | }
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| 221 |
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| 222 | template<class Obj,typename MemFun,typename P1,typename P2>
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| 223 | class obj_scope_guard_impl2:public scope_guard_impl_base
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| 224 | {
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| 225 | public:
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| 226 | obj_scope_guard_impl2(Obj& obj,MemFun mem_fun,P1 p1,P2 p2):
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| 227 | obj_(obj),mem_fun_(mem_fun),p1_(p1),p2_(p2)
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| 228 | {}
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| 229 | ~obj_scope_guard_impl2(){scope_guard_impl_base::safe_execute(*this);}
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| 230 | void execute(){(obj_.*mem_fun_)(p1_,p2_);}
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| 231 |
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| 232 | protected:
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| 233 | Obj& obj_;
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| 234 | MemFun mem_fun_;
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| 235 | const P1 p1_;
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| 236 | const P2 p2_;
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| 237 | };
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| 238 |
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| 239 | template<class Obj,typename MemFun,typename P1,typename P2>
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| 240 | inline obj_scope_guard_impl2<Obj,MemFun,P1,P2>
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| 241 | make_obj_guard(Obj& obj,MemFun mem_fun,P1 p1,P2 p2)
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| 242 | {
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| 243 | return obj_scope_guard_impl2<Obj,MemFun,P1,P2>(obj,mem_fun,p1,p2);
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| 244 | }
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| 245 |
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| 246 | template<class Obj,typename MemFun,typename P1,typename P2,typename P3>
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| 247 | class obj_scope_guard_impl3:public scope_guard_impl_base
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| 248 | {
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| 249 | public:
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| 250 | obj_scope_guard_impl3(Obj& obj,MemFun mem_fun,P1 p1,P2 p2,P3 p3):
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| 251 | obj_(obj),mem_fun_(mem_fun),p1_(p1),p2_(p2),p3_(p3)
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| 252 | {}
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| 253 | ~obj_scope_guard_impl3(){scope_guard_impl_base::safe_execute(*this);}
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| 254 | void execute(){(obj_.*mem_fun_)(p1_,p2_,p3_);}
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| 255 |
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| 256 | protected:
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| 257 | Obj& obj_;
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| 258 | MemFun mem_fun_;
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| 259 | const P1 p1_;
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| 260 | const P2 p2_;
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| 261 | const P3 p3_;
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| 262 | };
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| 263 |
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| 264 | template<class Obj,typename MemFun,typename P1,typename P2,typename P3>
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| 265 | inline obj_scope_guard_impl3<Obj,MemFun,P1,P2,P3>
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| 266 | make_obj_guard(Obj& obj,MemFun mem_fun,P1 p1,P2 p2,P3 p3)
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| 267 | {
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| 268 | return obj_scope_guard_impl3<Obj,MemFun,P1,P2,P3>(obj,mem_fun,p1,p2,p3);
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| 269 | }
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| 270 |
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| 271 | } /* namespace multi_index::detail */
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| 272 |
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| 273 | } /* namespace multi_index */
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| 274 |
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| 275 | } /* namespace boost */
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| 276 |
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| 277 | #endif
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