/usr/include/loki/Visitor.h is in libxdmf-dev 3.0+git20160803-3.
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// The Loki Library
// Copyright (c) 2001 by Andrei Alexandrescu
// This code accompanies the book:
// Alexandrescu, Andrei. "Modern C++ Design: Generic Programming and Design
// Patterns Applied". Copyright (c) 2001. Addison-Wesley.
// Permission to use, copy, modify, distribute and sell this software for any
// purpose is hereby granted without fee, provided that the above copyright
// notice appear in all copies and that both that copyright notice and this
// permission notice appear in supporting documentation.
// The author or Addison-Wesley Longman make no representations about the
// suitability of this software for any purpose. It is provided "as is"
// without express or implied warranty.
////////////////////////////////////////////////////////////////////////////////
// $Header: /cvsroot-fuse/loki-lib/loki/include/loki/Visitor.h,v 1.7 2006/01/16 19:05:09 rich_sposato Exp $
/// \defgroup VisitorGroup Visitor
#ifndef LOKI_VISITOR_INC_
#define LOKI_VISITOR_INC_
#include "Typelist.h"
#include "HierarchyGenerators.h"
#include "XdmfSharedPtr.hpp"
namespace Loki
{
////////////////////////////////////////////////////////////////////////////////
/// \class BaseVisitor
///
/// \ingroup VisitorGroup
/// The base class of any Acyclic Visitor
////////////////////////////////////////////////////////////////////////////////
class BaseVisitor
{
public:
virtual ~BaseVisitor() {}
};
////////////////////////////////////////////////////////////////////////////////
/// \class Visitor
///
/// \ingroup VisitorGroup
/// The building block of Acyclic Visitor
///
/// \par Usage
///
/// Defining the visitable class:
///
/// \code
/// class RasterBitmap : public BaseVisitable<>
/// {
/// public:
/// LOKI_DEFINE_VISITABLE()
/// };
/// \endcode
///
/// Way 1 to define a visitor:
/// \code
/// class SomeVisitor :
/// public BaseVisitor // required
/// public Visitor<RasterBitmap>,
/// public Visitor<Paragraph>
/// {
/// public:
/// void Visit(RasterBitmap&); // visit a RasterBitmap
/// void Visit(Paragraph &); // visit a Paragraph
/// };
/// \endcode
///
/// Way 2 to define the visitor:
/// \code
/// class SomeVisitor :
/// public BaseVisitor // required
/// public Visitor<LOKI_TYPELIST_2(RasterBitmap, Paragraph)>
/// {
/// public:
/// void Visit(RasterBitmap&); // visit a RasterBitmap
/// void Visit(Paragraph &); // visit a Paragraph
/// };
/// \endcode
///
/// Way 3 to define the visitor:
/// \code
/// class SomeVisitor :
/// public BaseVisitor // required
/// public Visitor<Seq<RasterBitmap, Paragraph>::Type>
/// {
/// public:
/// void Visit(RasterBitmap&); // visit a RasterBitmap
/// void Visit(Paragraph &); // visit a Paragraph
/// };
/// \endcode
///
/// \par Using const visit functions:
///
/// Defining the visitable class (true for const):
///
/// \code
/// class RasterBitmap : public BaseVisitable<void, DefaultCatchAll, true>
/// {
/// public:
/// LOKI_DEFINE_CONST_VISITABLE()
/// };
/// \endcode
///
/// Defining the visitor which only calls const member functions:
/// \code
/// class SomeVisitor :
/// public BaseVisitor // required
/// public Visitor<RasterBitmap, void, true>,
/// {
/// public:
/// void Visit(const RasterBitmap&); // visit a RasterBitmap by a const member function
/// };
/// \endcode
///
/// \par Example:
///
/// test/Visitor/main.cpp
////////////////////////////////////////////////////////////////////////////////
template <class T, typename R = void, bool ConstVisit = false>
class Visitor;
template <class T, typename R>
class Visitor<T, R, false>
{
public:
typedef R ReturnType;
typedef T ParamType;
virtual ~Visitor() {}
virtual ReturnType visit(ParamType&, shared_ptr<BaseVisitor>) = 0;
};
/*
template <class T, typename R>
class Visitor<T, R, true>
{
public:
typedef R ReturnType;
typedef const T ParamType;
virtual ~Visitor() {}
virtual ReturnType visit(ParamType&, shared_ptr<BaseVisitor>) = 0;
};
*/
////////////////////////////////////////////////////////////////////////////////
// class template Visitor (specialization)
// This specialization is not present in the book. It makes it easier to define
// Visitors for multiple types in a shot by using a typelist. Example:
//
// class SomeVisitor :
// public BaseVisitor // required
// public Visitor<LOKI_TYPELIST_2(RasterBitmap, Paragraph)>
// {
// public:
// void Visit(RasterBitmap&); // visit a RasterBitmap
// void Visit(Paragraph &); // visit a Paragraph
// };
////////////////////////////////////////////////////////////////////////////////
/* template <class Head, class Tail, typename R> */
/* class Visitor<Typelist<Head, Tail>, R, false> */
/* : public Visitor<Head, R, false>, public Visitor<Tail, R, false> */
/* { */
/* public: */
/* typedef R ReturnType; */
/* // using Visitor<Head, R>::Visit; */
/* // using Visitor<Tail, R>::Visit; */
/* }; */
/* template <class Head, typename R> */
/* class Visitor<Typelist<Head, NullType>, R, false> : public Visitor<Head, R, false> */
/* { */
/* public: */
/* typedef R ReturnType; */
/* using Visitor<Head, R, false>::Visit; */
/* }; */
/* template <class Head, class Tail, typename R> */
/* class Visitor<Typelist<Head, Tail>, R, true> */
/* : public Visitor<Head, R, true>, public Visitor<Tail, R, true> */
/* { */
/* public: */
/* typedef R ReturnType; */
/* // using Visitor<Head, R>::Visit; */
/* // using Visitor<Tail, R>::Visit; */
/* }; */
/* template <class Head, typename R> */
/* class Visitor<Typelist<Head, NullType>, R, true> : public Visitor<Head, R, true> */
/* { */
/* public: */
/* typedef R ReturnType; */
/* using Visitor<Head, R, true>::visit; */
/* }; */
////////////////////////////////////////////////////////////////////////////////
// class template BaseVisitorImpl
// Implements non-strict visitation (you can implement only part of the Visit
// functions)
////////////////////////////////////////////////////////////////////////////////
/*
template <class TList, typename R = void> class BaseVisitorImpl;
template <class Head, class Tail, typename R>
class BaseVisitorImpl<Typelist<Head, Tail>, R>
: public Visitor<Head, R>
, public BaseVisitorImpl<Tail, R>
{
public:
// using BaseVisitorImpl<Tail, R>::Visit;
virtual R visit(Head&, shared_ptr<BaseVisitor>)
{ return R(); }
};
template <class Head, typename R>
class BaseVisitorImpl<Typelist<Head, NullType>, R>
: public Visitor<Head, R>
{
public:
virtual R visit(Head&, shared_ptr<BaseVisitor>)
{ return R(); }
};
*/
////////////////////////////////////////////////////////////////////////////////
// class template BaseVisitable
////////////////////////////////////////////////////////////////////////////////
/*
template <typename R, typename Visited>
struct DefaultCatchAll
{
static R OnUnknownVisitor(Visited&, BaseVisitor&)
{ return R(); }
};
*/
////////////////////////////////////////////////////////////////////////////////
// class template BaseVisitable
////////////////////////////////////////////////////////////////////////////////
template
<
typename R = void,
bool ConstVisitable = false
>
class BaseVisitable;
template<typename R>
class BaseVisitable<R, false>
{
public:
typedef R ReturnType;
virtual ~BaseVisitable() {}
virtual ReturnType accept(const shared_ptr<BaseVisitor>&) = 0;
protected: // give access only to the hierarchy
template <class T>
static ReturnType acceptImpl(T& visited, const shared_ptr<BaseVisitor>& guest)
{
// Apply the Acyclic Visitor
if (Visitor<T,R>* p = dynamic_cast<Visitor<T,R>*>(guest.get()))
{
p->visit(visited, guest);
}
return;
}
};
template<typename R>
class BaseVisitable<R, true>
{
public:
typedef R ReturnType;
virtual ~BaseVisitable() {}
virtual ReturnType accept(BaseVisitor&) const = 0;
protected: // give access only to the hierarchy
template <class T>
static ReturnType acceptImpl(const T& visited, const shared_ptr<BaseVisitor>& guest)
{
// Apply the Acyclic Visitor
if (Visitor<T,R,true>* p = dynamic_cast<Visitor<T,R,true>*>(guest.get()))
{
p->visit(visited, guest);
}
return;
}
};
template< >
class BaseVisitable<void, false>
{
typedef void R;
public:
typedef R ReturnType;
virtual ~BaseVisitable() {}
virtual ReturnType accept(const shared_ptr<BaseVisitor>&) = 0;
protected: // give access only to the hierarchy
template <class T>
static ReturnType acceptImpl(T& visited, const shared_ptr<BaseVisitor>& guest)
{
// Apply the Acyclic Visitor
if (Visitor<T,R>* p = dynamic_cast<Visitor<T,R>*>(guest.get()))
{
p->visit(visited, guest);
}
}
};
template<>
class BaseVisitable<void, true>
{
typedef void R;
public:
typedef R ReturnType;
virtual ~BaseVisitable() {}
virtual ReturnType accept(BaseVisitor&) const = 0;
protected: // give access only to the hierarchy
template <class T>
static ReturnType acceptImpl(const T& visited, const shared_ptr<BaseVisitor>& guest)
{
// Apply the Acyclic Visitor
if (Visitor<T,R,true>* p = dynamic_cast<Visitor<T,R,true>*>(guest.get()))
{
p->visit(visited, guest);
}
}
};
////////////////////////////////////////////////////////////////////////////////
/// \def LOKI_DEFINE_VISITABLE()
/// \ingroup VisitorGroup
/// Put it in every class that you want to make visitable
/// (in addition to deriving it from BaseVisitable<R>)
////////////////////////////////////////////////////////////////////////////////
#define LOKI_DEFINE_VISITABLE_BASE() \
virtual void accept(const shared_ptr<Loki::BaseVisitor> &guest) \
{ acceptImpl(*this, guest); }
#define LOKI_DEFINE_VISITABLE(my_class, my_base) \
virtual void accept(const shared_ptr<Loki::BaseVisitor> &guest) \
{ \
Loki::BaseVisitor* t = guest.get();\
if (Loki::Visitor<my_class,ReturnType>* p = dynamic_cast<Loki::Visitor<my_class,ReturnType>*>(t)) \
{ \
p->visit(*this, guest); \
} \
else \
{ \
my_base::accept(guest); \
} \
}
////////////////////////////////////////////////////////////////////////////////
/// \def LOKI_DEFINE_CONST_VISITABLE()
/// \ingroup VisitorGroup
/// Put it in every class that you want to make visitable by const member
/// functions (in addition to deriving it from BaseVisitable<R>)
////////////////////////////////////////////////////////////////////////////////
/*
#define LOKI_DEFINE_CONST_VISITABLE() \
virtual ReturnType accept(const shared_ptr< ::Loki::BaseVisitor> guest) const \
{ return acceptImpl(*this, guest); }
////////////////////////////////////////////////////////////////////////////////
/// \class CyclicVisitor
///
/// \ingroup VisitorGroup
/// Put it in every class that you want to make visitable (in addition to
/// deriving it from BaseVisitable<R>
////////////////////////////////////////////////////////////////////////////////
template <typename R, class TList>
class CyclicVisitor : public Visitor<TList, R>
{
public:
typedef R ReturnType;
// using Visitor<TList, R>::Visit;
template <class Visited>
ReturnType GenericVisit(Visited& host)
{
Visitor<Visited, ReturnType>& subObj = *this;
return subObj.visit(host);
}
};
*/
////////////////////////////////////////////////////////////////////////////////
/// \def LOKI_DEFINE_CYCLIC_VISITABLE(SomeVisitor)
/// \ingroup VisitorGroup
/// Put it in every class that you want to make visitable by a cyclic visitor
////////////////////////////////////////////////////////////////////////////////
/*
#define LOKI_DEFINE_CYCLIC_VISITABLE(SomeVisitor) \
virtual SomeVisitor::ReturnType accept(SomeVisitor& guest) \
{ return guest.GenericVisit(*this); }
*/
} // namespace Loki
typedef Loki::BaseVisitor XdmfBaseVisitor;
////////////////////////////////////////////////////////////////////////////////
// Change log:
// March 20, ????: add default argument DefaultCatchAll to BaseVisitable
// June 20, 2001: ported by Nick Thurn to gcc 2.95.3. Kudos, Nick!!!
// September 28, 2004: replaced Loki:: with ::Loki:: in DEFINE_VISITABLE
// January 2, 2006: add support for visiting constant member functions, Peter K�mmel
////////////////////////////////////////////////////////////////////////////////
#endif // VISITOR_INC_
// $Log: Visitor.h,v $
// Revision 1.7 2006/01/16 19:05:09 rich_sposato
// Added cvs keywords.
//
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