/* 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