Rani Sharoni's port
git-svn-id: svn://svn.code.sf.net/p/loki-lib/code/trunk@33 7ec92016-0320-0410-acc4-a06ded1c099a
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328
MSVC/1300/Visitor.h
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328
MSVC/1300/Visitor.h
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////////////////////////////////////////////////////////////////////////////////
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// The Loki Library
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// Copyright (c) 2001 by Andrei Alexandrescu
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// This code accompanies the book:
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// Alexandrescu, Andrei. "Modern C++ Design: Generic Programming and Design
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// Patterns Applied". Copyright (c) 2001. Addison-Wesley.
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// Permission to use, copy, modify, distribute and sell this software for any
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// purpose is hereby granted without fee, provided that the above copyright
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// notice appear in all copies and that both that copyright notice and this
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// permission notice appear in supporting documentation.
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// The author or Addison-Welsey Longman make no representations about the
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// suitability of this software for any purpose. It is provided "as is"
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// without express or implied warranty.
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////////////////////////////////////////////////////////////////////////////////
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// Last update: May 19, 2002
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#ifndef VISITOR_INC_
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#define VISITOR_INC_
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#include "Typelist.h"
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#include "HierarchyGenerators.h"
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namespace Loki
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{
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////////////////////////////////////////////////////////////////////////////////
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// class template BaseVisitor
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// The base class of any Acyclic Visitor
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////////////////////////////////////////////////////////////////////////////////
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class BaseVisitor
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{
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public:
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virtual ~BaseVisitor() {}
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template Visitor
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// Forward decleration
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////////////////////////////////////////////////////////////////////////////////
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template <class T, typename R = void>
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class Visitor;
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namespace Private
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{
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// for some reason VC7 needs the base definition altough not in use
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template <typename TListTag>
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struct VisitorHelper1
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{
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template <typename T, typename R>
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struct In
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{
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typedef typename T::ERROR_THIS_INSTANCE_SELECTED Result;
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};
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};
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template <typename TListTag>
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struct VisitorHelper2
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{
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template <typename T, typename R>
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struct In
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{
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typedef typename T::ERROR_THIS_INSTANCE_SELECTED Result;
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};
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};
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template <>
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struct VisitorHelper1<TL::Typelist_tag>
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{
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template <class TList, typename R>
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struct In
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{
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typedef Visitor<typename TList::Head, R> Result;
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};
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};
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template <>
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struct VisitorHelper2<TL::Typelist_tag>
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{
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template <class TList, typename R>
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struct In
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{
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private:
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template<typename Tail>
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struct In1
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{
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typedef Visitor<typename TList::Tail, R> Result;
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};
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template<>
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struct In1<NullType>
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{
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struct Result {};
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};
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public:
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typedef typename In1<typename TList::Tail>::Result Result;
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};
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};
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template <>
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struct VisitorHelper1<TL::NoneList_tag>
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{
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template <class T, typename R>
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struct In
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{
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struct Result
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{
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typedef R ReturnType;
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virtual ReturnType Visit(T&) = 0;
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};
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};
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};
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template <>
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struct VisitorHelper2<TL::NoneList_tag>
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{
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template <class T, typename R>
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struct In { struct Result {}; };
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};
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} // namespace Private
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////////////////////////////////////////////////////////////////////////////////
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// class template Visitor
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// The building block of Acyclic Visitor
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////////////////////////////////////////////////////////////////////////////////
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template <class T, typename R>
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class Visitor
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: public Private::VisitorHelper1
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<
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typename TL::is_Typelist<T>::type_tag
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>
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::template In<T, R>::Result
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, public Private::VisitorHelper2
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<
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typename TL::is_Typelist<T>::type_tag
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>
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::template In<T, R>::Result
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{
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public:
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typedef R ReturnType;
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template BaseVisitorImpl
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// Implements non-strict visitation (you can implement only part of the Visit
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// functions)
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////////////////////////////////////////////////////////////////////////////////
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template <class TList, typename R = void>
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class BaseVisitorImpl;
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namespace Private
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{
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// for some reason VC7 needs the base definition altough not in use
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template<typename TListTag>
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struct BaseVisitorImplHelper
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{
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template <typename T, typename R>
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struct In
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{
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typedef typename T::ERROR_THIS_INSTANCE_SELECTED Result;
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};
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};
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template<>
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struct BaseVisitorImplHelper<TL::Typelist_tag>
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{
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template <typename TList, typename R>
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struct In
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{
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typedef BaseVisitorImpl<TList, R> Result;
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};
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};
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template<>
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struct BaseVisitorImplHelper<TL::NullType_tag>
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{
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template <typename TList, typename R>
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struct In
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{
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struct Result {};
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};
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};
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} // namespace Private
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template <class TList, typename R>
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class BaseVisitorImpl
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: public Visitor<typename TList::Head, R>
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, public Private::BaseVisitorImplHelper
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<
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typename TL::is_Typelist<typename TList::Tail>::type_tag
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>
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::template In<typename TList::Tail, R>::Result
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{
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ASSERT_TYPELIST(TList);
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public:
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// using BaseVisitorImpl<Tail, R>::Visit;
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virtual R Visit(typename TList::Head&)
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{ return R(); }
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template NonStrictVisitor
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// Implements non-strict visitation (you can implement only part of the Visit
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// functions)
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////////////////////////////////////////////////////////////////////////////////
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template <class T, class Base>
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struct NonStrictVisitorUnit : public Base
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{
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typedef typename Base::ReturnType ReturnType;
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ReturnType Visit(T&)
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{
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return ReturnType();
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}
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};
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template <class TList, typename R = void>
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class NonStrictVisitor
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: public GenLinearHierarchy<
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TList,
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NonStrictVisitorUnit,
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Visitor<TList, R> >
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{
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template BaseVisitable
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////////////////////////////////////////////////////////////////////////////////
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template <typename R, typename Visited>
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struct DefaultCatchAll
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{
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static R OnUnknownVisitor(Visited&, BaseVisitor&)
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{ return R(); }
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};
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////////////////////////////////////////////////////////////////////////////////
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// class template BaseVisitable
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////////////////////////////////////////////////////////////////////////////////
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template
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<
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typename R = void,
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template <typename, class> class CatchAll = DefaultCatchAll
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>
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class BaseVisitable
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{
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public:
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typedef R ReturnType;
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virtual ~BaseVisitable() {}
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virtual ReturnType Accept(BaseVisitor&) = 0;
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protected: // give access only to the hierarchy
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template <class T>
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static ReturnType AcceptImpl(T& visited, BaseVisitor& guest)
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{
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// Apply the Acyclic Visitor
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if (Visitor<T,R>* p = dynamic_cast<Visitor<T,R>*>(&guest))
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{
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return p->Visit(visited);
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}
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return CatchAll<R, T>::OnUnknownVisitor(visited, guest);
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}
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};
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////////////////////////////////////////////////////////////////////////////////
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// macro DEFINE_VISITABLE
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// Put it in every class that you want to make visitable (in addition to
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// deriving it from BaseVisitable<R>
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////////////////////////////////////////////////////////////////////////////////
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#define DEFINE_VISITABLE() \
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virtual ReturnType Accept(BaseVisitor& guest) \
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{ return AcceptImpl(*this, guest); }
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////////////////////////////////////////////////////////////////////////////////
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// class template CyclicVisitor
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// Put it in every class that you want to make visitable (in addition to
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// deriving it from BaseVisitable<R>
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////////////////////////////////////////////////////////////////////////////////
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template <typename R, class TList>
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class CyclicVisitor : public Visitor<TList, R>
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{
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public:
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typedef R ReturnType;
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// using Visitor<TList, R>::Visit;
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virtual ~CyclicVisitor() {}
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template <class Visited>
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ReturnType GenericVisit(Visited& host)
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{
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Visitor<Visited, ReturnType>& subObj = *this;
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return subObj.Visit(host);
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}
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};
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////////////////////////////////////////////////////////////////////////////////
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// macro DEFINE_CYCLIC_VISITABLE
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// Put it in every class that you want to make visitable by a cyclic visitor
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////////////////////////////////////////////////////////////////////////////////
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#define DEFINE_CYCLIC_VISITABLE(SomeVisitor) \
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virtual SomeVisitor::ReturnType Accept(SomeVisitor& guest) \
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{ return guest.GenericVisit(*this); }
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} // namespace Loki
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////////////////////////////////////////////////////////////////////////////////
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// Change log:
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// March 20: add default argument DefaultCatchAll to BaseVisitable
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// June 20, 2001: ported by Nick Thurn to gcc 2.95.3. Kudos, Nick!!!
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////////////////////////////////////////////////////////////////////////////////
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#endif // VISITOR_INC_
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