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+/* Copyright 2003-2013 Joaquin M Lopez Munoz.
+ * 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)
+#pragma once
+#endif
+
+#include <boost/detail/no_exceptions_support.hpp>
+#include <boost/mpl/if.hpp>
+
+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.drdobbs.com/184403758
+ * with the following modifications:
+ *   - General pretty formatting (pretty to my taste at least.)
+ *   - Naming style changed to standard C++ library requirements.
+ *   - 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.
+ * 
+ * We also define the following variants of the idiom:
+ * 
+ *   - make_guard_if_c<bool>( ... )
+ *   - make_guard_if<IntegralConstant>( ... )
+ *   - make_obj_guard_if_c<bool>( ... )
+ *   - make_obj_guard_if<IntegralConstant>( ... )
+ * which may be used with a compile-time constant to yield
+ * a "null_guard" if the boolean compile-time parameter is false,
+ * or conversely, the guard is only constructed if the constant is true.
+ * This is useful to avoid extra tagging, because the returned
+ * null_guard can be optimzed comlpetely away by the compiler.
+ */
+
+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){
+    BOOST_TRY{
+      if(!j.dismissed_)j.execute();
+    }
+    BOOST_CATCH(...){}
+    BOOST_CATCH_END
+  }
+  
+  mutable bool dismissed_;
+
+private:
+  scope_guard_impl_base& operator=(const scope_guard_impl_base&);
+};
+
+typedef const scope_guard_impl_base& scope_guard;
+
+struct null_guard : public scope_guard_impl_base
+{
+    template< class T1 >
+    null_guard( const T1& )
+    { }
+
+    template< class T1, class T2 >
+    null_guard( const T1&, const T2& )
+    { }
+
+    template< class T1, class T2, class T3 >
+    null_guard( const T1&, const T2&, const T3& )
+    { }
+
+    template< class T1, class T2, class T3, class T4 >
+    null_guard( const T1&, const T2&, const T3&, const T4& )
+    { }
+
+    template< class T1, class T2, class T3, class T4, class T5 >
+    null_guard( const T1&, const T2&, const T3&, const T4&, const T5& )
+    { }
+};
+
+template< bool cond, class T >
+struct null_guard_return
+{
+    typedef typename boost::mpl::if_c<cond,T,null_guard>::type type;
+};
+
+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<bool cond, typename F> 
+inline typename null_guard_return<cond,scope_guard_impl0<F> >::type  
+make_guard_if_c(F fun)
+{
+  return typename null_guard_return<cond,scope_guard_impl0<F> >::type(fun);
+}
+
+template<typename C, typename F> 
+inline typename null_guard_return<C::value,scope_guard_impl0<F> >::type  
+make_guard_if(F fun)
+{
+  return make_guard_if<C::value>(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<bool cond, typename F,typename P1> 
+inline typename null_guard_return<cond,scope_guard_impl1<F,P1> >::type 
+make_guard_if_c(F fun,P1 p1)
+{
+  return typename null_guard_return<cond,scope_guard_impl1<F,P1> >::type(fun,p1);
+}
+
+template<typename C, typename F,typename P1> 
+inline typename null_guard_return<C::value,scope_guard_impl1<F,P1> >::type 
+make_guard_if(F fun,P1 p1)
+{
+  return make_guard_if_c<C::value>(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<bool cond, typename F,typename P1,typename P2>
+inline typename null_guard_return<cond,scope_guard_impl2<F,P1,P2> >::type
+make_guard_if_c(F fun,P1 p1,P2 p2)
+{
+  return typename null_guard_return<cond,scope_guard_impl2<F,P1,P2> >::type(fun,p1,p2);
+}
+
+template<typename C, typename F,typename P1,typename P2>
+inline typename null_guard_return<C::value,scope_guard_impl2<F,P1,P2> >::type
+make_guard_if(F fun,P1 p1,P2 p2)
+{
+  return make_guard_if_c<C::value>(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<bool cond,typename F,typename P1,typename P2,typename P3>
+inline typename null_guard_return<cond,scope_guard_impl3<F,P1,P2,P3> >::type 
+make_guard_if_c(F fun,P1 p1,P2 p2,P3 p3)
+{
+  return typename null_guard_return<cond,scope_guard_impl3<F,P1,P2,P3> >::type(fun,p1,p2,p3);
+}
+
+template<typename C,typename F,typename P1,typename P2,typename P3>
+inline typename null_guard_return< C::value,scope_guard_impl3<F,P1,P2,P3> >::type 
+make_guard_if(F fun,P1 p1,P2 p2,P3 p3)
+{
+  return make_guard_if_c<C::value>(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<bool cond, typename F,typename P1,typename P2,typename P3,typename P4>
+inline typename null_guard_return<cond,scope_guard_impl4<F,P1,P2,P3,P4> >::type 
+make_guard_if_c(
+  F fun,P1 p1,P2 p2,P3 p3,P4 p4)
+{
+  return typename null_guard_return<cond,scope_guard_impl4<F,P1,P2,P3,P4> >::type(fun,p1,p2,p3,p4);
+}
+
+template<typename C, typename F,typename P1,typename P2,typename P3,typename P4>
+inline typename null_guard_return<C::value,scope_guard_impl4<F,P1,P2,P3,P4> >::type 
+make_guard_if(
+  F fun,P1 p1,P2 p2,P3 p3,P4 p4)
+{
+  return make_guard_if_c<C::value>(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<bool cond, class Obj,typename MemFun>
+inline typename null_guard_return<cond,obj_scope_guard_impl0<Obj,MemFun> >::type 
+make_obj_guard_if_c(Obj& obj,MemFun mem_fun)
+{
+  return typename null_guard_return<cond,obj_scope_guard_impl0<Obj,MemFun> >::type(obj,mem_fun);
+}
+
+template<typename C, class Obj,typename MemFun>
+inline typename null_guard_return<C::value,obj_scope_guard_impl0<Obj,MemFun> >::type 
+make_obj_guard_if(Obj& obj,MemFun mem_fun)
+{
+  return make_obj_guard_if_c<C::value>(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<bool cond, class Obj,typename MemFun,typename P1>
+inline typename null_guard_return<cond,obj_scope_guard_impl1<Obj,MemFun,P1> >::type 
+make_obj_guard_if_c(  Obj& obj,MemFun mem_fun,P1 p1)
+{
+  return typename null_guard_return<cond,obj_scope_guard_impl1<Obj,MemFun,P1> >::type(obj,mem_fun,p1);
+}
+
+template<typename C, class Obj,typename MemFun,typename P1>
+inline typename null_guard_return<C::value,obj_scope_guard_impl1<Obj,MemFun,P1> >::type 
+make_obj_guard_if( Obj& obj,MemFun mem_fun,P1 p1)
+{
+  return make_obj_guard_if_c<C::value>(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<bool cond, class Obj,typename MemFun,typename P1,typename P2>
+inline typename null_guard_return<cond,obj_scope_guard_impl2<Obj,MemFun,P1,P2> >::type
+make_obj_guard_if_c(Obj& obj,MemFun mem_fun,P1 p1,P2 p2)
+{
+  return typename null_guard_return<cond,obj_scope_guard_impl2<Obj,MemFun,P1,P2> >::type(obj,mem_fun,p1,p2);
+}
+
+template<typename C, class Obj,typename MemFun,typename P1,typename P2>
+inline typename null_guard_return<C::value,obj_scope_guard_impl2<Obj,MemFun,P1,P2> >::type
+make_obj_guard_if(Obj& obj,MemFun mem_fun,P1 p1,P2 p2)
+{
+  return make_obj_guard_if_c<C::value>(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);
+}
+
+template<bool cond, class Obj,typename MemFun,typename P1,typename P2,typename P3>
+inline typename null_guard_return<cond,obj_scope_guard_impl3<Obj,MemFun,P1,P2,P3> >::type
+make_obj_guard_if_c(Obj& obj,MemFun mem_fun,P1 p1,P2 p2,P3 p3)
+{
+  return typename null_guard_return<cond,obj_scope_guard_impl3<Obj,MemFun,P1,P2,P3> >::type(obj,mem_fun,p1,p2,p3);
+}
+
+template<typename C, class Obj,typename MemFun,typename P1,typename P2,typename P3>
+inline typename null_guard_return<C::value,obj_scope_guard_impl3<Obj,MemFun,P1,P2,P3> >::type
+make_obj_guard_if(Obj& obj,MemFun mem_fun,P1 p1,P2 p2,P3 p3)
+{
+  return make_obj_guard_if_c<C::value>(obj,mem_fun,p1,p2,p3);
+}
+
+} /* namespace multi_index::detail */
+
+} /* namespace multi_index */
+
+} /* namespace boost */
+
+#endif