--- /dev/null
+/* Copyright 2003-2005 Joaquín M López Muñoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See http://www.boost.org/libs/multi_index for library home page.
+ */
+
+#ifndef BOOST_MULTI_INDEX_DETAIL_SCOPE_GUARD_HPP
+#define BOOST_MULTI_INDEX_DETAIL_SCOPE_GUARD_HPP
+
+#if defined(_MSC_VER)&&(_MSC_VER>=1200)
+#pragma once
+#endif
+
+namespace boost{
+
+namespace multi_index{
+
+namespace detail{
+
+/* Until some official version of the ScopeGuard idiom makes it into Boost,
+ * we locally define our own. This is a merely reformated version of
+ * ScopeGuard.h as defined in:
+ * Alexandrescu, A., Marginean, P.:"Generic<Programming>: Change the Way You
+ * Write Exception-Safe Code - Forever", C/C++ Users Jornal, Dec 2000,
+ * http://www.cuj.com/documents/s=8000/cujcexp1812alexandr/
+ * with the following modifications:
+ * - General pretty formatting (pretty to my taste at least.)
+ * - Naming style changed to standard C++ library requirements.
+ * - safe_execute does not feature a try-catch protection, so we can
+ * use this even if BOOST_NO_EXCEPTIONS is defined.
+ * - Added scope_guard_impl4 and obj_scope_guard_impl3, (Boost.MultiIndex
+ * needs them). A better design would provide guards for many more
+ * arguments through the Boost Preprocessor Library.
+ * - Added scope_guard_impl_base::touch (see below.)
+ * - Removed RefHolder and ByRef, whose functionality is provided
+ * already by Boost.Ref.
+ * - Removed static make_guard's and make_obj_guard's, so that the code
+ * will work even if BOOST_NO_MEMBER_TEMPLATES is defined. This forces
+ * us to move some private ctors to public, though.
+ *
+ * NB: CodeWarrior Pro 8 seems to have problems looking up safe_execute
+ * without an explicit qualification.
+ */
+
+class scope_guard_impl_base
+{
+public:
+ scope_guard_impl_base():dismissed_(false){}
+ void dismiss()const{dismissed_=true;}
+
+ /* This helps prevent some "unused variable" warnings under, for instance,
+ * GCC 3.2.
+ */
+ void touch()const{}
+
+protected:
+ ~scope_guard_impl_base(){}
+
+ scope_guard_impl_base(const scope_guard_impl_base& other):
+ dismissed_(other.dismissed_)
+ {
+ other.dismiss();
+ }
+
+ template<typename J>
+ static void safe_execute(J& j){if(!j.dismissed_)j.execute();}
+
+ mutable bool dismissed_;
+
+private:
+ scope_guard_impl_base& operator=(const scope_guard_impl_base&);
+};
+
+typedef const scope_guard_impl_base& scope_guard;
+
+template<typename F>
+class scope_guard_impl0:public scope_guard_impl_base
+{
+public:
+ scope_guard_impl0(F fun):fun_(fun){}
+ ~scope_guard_impl0(){scope_guard_impl_base::safe_execute(*this);}
+ void execute(){fun_();}
+
+protected:
+
+ F fun_;
+};
+
+template<typename F>
+inline scope_guard_impl0<F> make_guard(F fun)
+{
+ return scope_guard_impl0<F>(fun);
+}
+
+template<typename F,typename P1>
+class scope_guard_impl1:public scope_guard_impl_base
+{
+public:
+ scope_guard_impl1(F fun,P1 p1):fun_(fun),p1_(p1){}
+ ~scope_guard_impl1(){scope_guard_impl_base::safe_execute(*this);}
+ void execute(){fun_(p1_);}
+
+protected:
+ F fun_;
+ const P1 p1_;
+};
+
+template<typename F,typename P1>
+inline scope_guard_impl1<F,P1> make_guard(F fun,P1 p1)
+{
+ return scope_guard_impl1<F,P1>(fun,p1);
+}
+
+template<typename F,typename P1,typename P2>
+class scope_guard_impl2:public scope_guard_impl_base
+{
+public:
+ scope_guard_impl2(F fun,P1 p1,P2 p2):fun_(fun),p1_(p1),p2_(p2){}
+ ~scope_guard_impl2(){scope_guard_impl_base::safe_execute(*this);}
+ void execute(){fun_(p1_,p2_);}
+
+protected:
+ F fun_;
+ const P1 p1_;
+ const P2 p2_;
+};
+
+template<typename F,typename P1,typename P2>
+inline scope_guard_impl2<F,P1,P2> make_guard(F fun,P1 p1,P2 p2)
+{
+ return scope_guard_impl2<F,P1,P2>(fun,p1,p2);
+}
+
+template<typename F,typename P1,typename P2,typename P3>
+class scope_guard_impl3:public scope_guard_impl_base
+{
+public:
+ scope_guard_impl3(F fun,P1 p1,P2 p2,P3 p3):fun_(fun),p1_(p1),p2_(p2),p3_(p3){}
+ ~scope_guard_impl3(){scope_guard_impl_base::safe_execute(*this);}
+ void execute(){fun_(p1_,p2_,p3_);}
+
+protected:
+ F fun_;
+ const P1 p1_;
+ const P2 p2_;
+ const P3 p3_;
+};
+
+template<typename F,typename P1,typename P2,typename P3>
+inline scope_guard_impl3<F,P1,P2,P3> make_guard(F fun,P1 p1,P2 p2,P3 p3)
+{
+ return scope_guard_impl3<F,P1,P2,P3>(fun,p1,p2,p3);
+}
+
+template<typename F,typename P1,typename P2,typename P3,typename P4>
+class scope_guard_impl4:public scope_guard_impl_base
+{
+public:
+ scope_guard_impl4(F fun,P1 p1,P2 p2,P3 p3,P4 p4):
+ fun_(fun),p1_(p1),p2_(p2),p3_(p3),p4_(p4){}
+ ~scope_guard_impl4(){scope_guard_impl_base::safe_execute(*this);}
+ void execute(){fun_(p1_,p2_,p3_,p4_);}
+
+protected:
+ F fun_;
+ const P1 p1_;
+ const P2 p2_;
+ const P3 p3_;
+ const P4 p4_;
+};
+
+template<typename F,typename P1,typename P2,typename P3,typename P4>
+inline scope_guard_impl4<F,P1,P2,P3,P4> make_guard(
+ F fun,P1 p1,P2 p2,P3 p3,P4 p4)
+{
+ return scope_guard_impl4<F,P1,P2,P3,P4>(fun,p1,p2,p3,p4);
+}
+
+template<class Obj,typename MemFun>
+class obj_scope_guard_impl0:public scope_guard_impl_base
+{
+public:
+ obj_scope_guard_impl0(Obj& obj,MemFun mem_fun):obj_(obj),mem_fun_(mem_fun){}
+ ~obj_scope_guard_impl0(){scope_guard_impl_base::safe_execute(*this);}
+ void execute(){(obj_.*mem_fun_)();}
+
+protected:
+ Obj& obj_;
+ MemFun mem_fun_;
+};
+
+template<class Obj,typename MemFun>
+inline obj_scope_guard_impl0<Obj,MemFun> make_obj_guard(Obj& obj,MemFun mem_fun)
+{
+ return obj_scope_guard_impl0<Obj,MemFun>(obj,mem_fun);
+}
+
+template<class Obj,typename MemFun,typename P1>
+class obj_scope_guard_impl1:public scope_guard_impl_base
+{
+public:
+ obj_scope_guard_impl1(Obj& obj,MemFun mem_fun,P1 p1):
+ obj_(obj),mem_fun_(mem_fun),p1_(p1){}
+ ~obj_scope_guard_impl1(){scope_guard_impl_base::safe_execute(*this);}
+ void execute(){(obj_.*mem_fun_)(p1_);}
+
+protected:
+ Obj& obj_;
+ MemFun mem_fun_;
+ const P1 p1_;
+};
+
+template<class Obj,typename MemFun,typename P1>
+inline obj_scope_guard_impl1<Obj,MemFun,P1> make_obj_guard(
+ Obj& obj,MemFun mem_fun,P1 p1)
+{
+ return obj_scope_guard_impl1<Obj,MemFun,P1>(obj,mem_fun,p1);
+}
+
+template<class Obj,typename MemFun,typename P1,typename P2>
+class obj_scope_guard_impl2:public scope_guard_impl_base
+{
+public:
+ obj_scope_guard_impl2(Obj& obj,MemFun mem_fun,P1 p1,P2 p2):
+ obj_(obj),mem_fun_(mem_fun),p1_(p1),p2_(p2)
+ {}
+ ~obj_scope_guard_impl2(){scope_guard_impl_base::safe_execute(*this);}
+ void execute(){(obj_.*mem_fun_)(p1_,p2_);}
+
+protected:
+ Obj& obj_;
+ MemFun mem_fun_;
+ const P1 p1_;
+ const P2 p2_;
+};
+
+template<class Obj,typename MemFun,typename P1,typename P2>
+inline obj_scope_guard_impl2<Obj,MemFun,P1,P2>
+make_obj_guard(Obj& obj,MemFun mem_fun,P1 p1,P2 p2)
+{
+ return obj_scope_guard_impl2<Obj,MemFun,P1,P2>(obj,mem_fun,p1,p2);
+}
+
+template<class Obj,typename MemFun,typename P1,typename P2,typename P3>
+class obj_scope_guard_impl3:public scope_guard_impl_base
+{
+public:
+ obj_scope_guard_impl3(Obj& obj,MemFun mem_fun,P1 p1,P2 p2,P3 p3):
+ obj_(obj),mem_fun_(mem_fun),p1_(p1),p2_(p2),p3_(p3)
+ {}
+ ~obj_scope_guard_impl3(){scope_guard_impl_base::safe_execute(*this);}
+ void execute(){(obj_.*mem_fun_)(p1_,p2_,p3_);}
+
+protected:
+ Obj& obj_;
+ MemFun mem_fun_;
+ const P1 p1_;
+ const P2 p2_;
+ const P3 p3_;
+};
+
+template<class Obj,typename MemFun,typename P1,typename P2,typename P3>
+inline obj_scope_guard_impl3<Obj,MemFun,P1,P2,P3>
+make_obj_guard(Obj& obj,MemFun mem_fun,P1 p1,P2 p2,P3 p3)
+{
+ return obj_scope_guard_impl3<Obj,MemFun,P1,P2,P3>(obj,mem_fun,p1,p2,p3);
+}
+
+} /* namespace multi_index::detail */
+
+} /* namespace multi_index */
+
+} /* namespace boost */
+
+#endif
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