111 lines
2.8 KiB
C++
111 lines
2.8 KiB
C++
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/* Copyright 2003-2013 Joaquin M Lopez Munoz.
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* 2019 Mike Dev <mike.dev@gmx.de>
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* https://www.boost.org/LICENSE_1_0.txt)
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*
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* NOTE: internalized from Boost.MultiIndex
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*
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*/
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#ifndef BOOST_SIGNALS2_DETAIL_SCOPE_GUARD_HPP
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#define BOOST_SIGNALS2_DETAIL_SCOPE_GUARD_HPP
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/core/no_exceptions_support.hpp>
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namespace boost{
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namespace signals2{
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namespace detail{
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/* This is a merely reformated version of
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* ScopeGuard.h as defined in:
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* Alexandrescu, A., Marginean, P.:"Generic<Programming>: Change the Way You
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* Write Exception-Safe Code - Forever", C/C++ Users Jornal, Dec 2000,
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* http://www.drdobbs.com/184403758
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* with the following modifications:
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* - General pretty formatting (pretty to my taste at least.)
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* - Naming style changed to standard C++ library requirements.
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* - Removed RefHolder and ByRef, whose functionality is provided
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* already by Boost.Ref.
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* - Removed static make_guard's and make_obj_guard's, so that the code
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* will work even if BOOST_NO_MEMBER_TEMPLATES is defined. This forces
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* us to move some private ctors to public, though.
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*
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* NB: CodeWarrior Pro 8 seems to have problems looking up safe_execute
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* without an explicit qualification.
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*
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* TODO: Consider replacing with Boost.ScopeExit
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*
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*/
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class scope_guard_impl_base
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{
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public:
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scope_guard_impl_base():dismissed_(false){}
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void dismiss()const{dismissed_=true;}
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protected:
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~scope_guard_impl_base(){}
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scope_guard_impl_base(const scope_guard_impl_base& other):
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dismissed_(other.dismissed_)
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{
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other.dismiss();
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}
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template<typename J>
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static void safe_execute(J& j){
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BOOST_TRY{
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if(!j.dismissed_)j.execute();
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}
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BOOST_CATCH(...){}
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BOOST_CATCH_END
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}
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mutable bool dismissed_;
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private:
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scope_guard_impl_base& operator=(const scope_guard_impl_base&);
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};
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typedef const scope_guard_impl_base& scope_guard;
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template<class Obj,typename MemFun,typename P1,typename P2>
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class obj_scope_guard_impl2:public scope_guard_impl_base
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{
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public:
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obj_scope_guard_impl2(Obj& obj,MemFun mem_fun,P1 p1,P2 p2):
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obj_(obj),mem_fun_(mem_fun),p1_(p1),p2_(p2)
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{}
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~obj_scope_guard_impl2(){scope_guard_impl_base::safe_execute(*this);}
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void execute(){(obj_.*mem_fun_)(p1_,p2_);}
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protected:
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Obj& obj_;
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MemFun mem_fun_;
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const P1 p1_;
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const P2 p2_;
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};
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template<class Obj,typename MemFun,typename P1,typename P2>
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inline obj_scope_guard_impl2<Obj,MemFun,P1,P2>
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make_obj_guard(Obj& obj,MemFun mem_fun,P1 p1,P2 p2)
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{
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return obj_scope_guard_impl2<Obj,MemFun,P1,P2>(obj,mem_fun,p1,p2);
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}
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} /* namespace signals2::detail */
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} /* namespace signals2 */
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} /* namespace boost */
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#endif
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