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authorDaniel Wilhelm <daniel@wili.li>2014-04-18 17:10:11 +0200
committerDaniel Wilhelm <daniel@wili.li>2014-04-18 17:10:11 +0200
commitc0cdb2ad99a1e2a6ade5ce76c91177a79258e669 (patch)
tree4701a015385d9a6a5a4ba99a8f1f5d400fff26b1 /shared/loki/Visitor.h
parent3.13 (diff)
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3.14
Diffstat (limited to 'shared/loki/Visitor.h')
-rw-r--r--shared/loki/Visitor.h314
1 files changed, 157 insertions, 157 deletions
diff --git a/shared/loki/Visitor.h b/shared/loki/Visitor.h
index 4425a9fa..f6b0ad81 100644
--- a/shared/loki/Visitor.h
+++ b/shared/loki/Visitor.h
@@ -2,14 +2,14 @@
// The Loki Library
// Copyright (c) 2001 by Andrei Alexandrescu
// This code accompanies the book:
-// Alexandrescu, Andrei. "Modern C++ Design: Generic Programming and Design
+// 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 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"
+// 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.
////////////////////////////////////////////////////////////////////////////////
#ifndef LOKI_VISITOR_INC_
@@ -28,17 +28,17 @@ namespace Loki
////////////////////////////////////////////////////////////////////////////////
/// \class BaseVisitor
-///
+///
/// \ingroup VisitorGroup
/// The base class of any Acyclic Visitor
////////////////////////////////////////////////////////////////////////////////
- class BaseVisitor
- {
- public:
- virtual ~BaseVisitor() {}
- };
-
+class BaseVisitor
+{
+public:
+ virtual ~BaseVisitor() {}
+};
+
////////////////////////////////////////////////////////////////////////////////
/// \class Visitor
///
@@ -48,7 +48,7 @@ namespace Loki
/// \par Usage
///
/// Defining the visitable class:
-///
+///
/// \code
/// class RasterBitmap : public BaseVisitable<>
/// {
@@ -59,7 +59,7 @@ namespace Loki
///
/// Way 1 to define a visitor:
/// \code
-/// class SomeVisitor :
+/// class SomeVisitor :
/// public BaseVisitor // required
/// public Visitor<RasterBitmap>,
/// public Visitor<Paragraph>
@@ -72,7 +72,7 @@ namespace Loki
///
/// Way 2 to define the visitor:
/// \code
-/// class SomeVisitor :
+/// class SomeVisitor :
/// public BaseVisitor // required
/// public Visitor<LOKI_TYPELIST_2(RasterBitmap, Paragraph)>
/// {
@@ -84,7 +84,7 @@ namespace Loki
///
/// Way 3 to define the visitor:
/// \code
-/// class SomeVisitor :
+/// class SomeVisitor :
/// public BaseVisitor // required
/// public Visitor<Seq<RasterBitmap, Paragraph>::Type>
/// {
@@ -97,7 +97,7 @@ namespace Loki
/// \par Using const visit functions:
///
/// Defining the visitable class (true for const):
-///
+///
/// \code
/// class RasterBitmap : public BaseVisitable<void, DefaultCatchAll, true>
/// {
@@ -108,7 +108,7 @@ namespace Loki
///
/// Defining the visitor which only calls const member functions:
/// \code
-/// class SomeVisitor :
+/// class SomeVisitor :
/// public BaseVisitor // required
/// public Visitor<RasterBitmap, void, true>,
/// {
@@ -119,38 +119,38 @@ namespace Loki
///
/// \par Example:
///
-/// test/Visitor/main.cpp
+/// test/Visitor/main.cpp
////////////////////////////////////////////////////////////////////////////////
- template <class T, typename R = void, bool ConstVisit = false>
- class Visitor;
+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&) = 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&) = 0;
- };
+template <class T, typename R>
+class Visitor<T, R, false>
+{
+public:
+ typedef R ReturnType;
+ typedef T ParamType;
+ virtual ~Visitor() {}
+ virtual ReturnType Visit(ParamType&) = 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&) = 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 :
+// class SomeVisitor :
// public BaseVisitor // required
// public Visitor<LOKI_TYPELIST_2(RasterBitmap, Paragraph)>
// {
@@ -160,41 +160,41 @@ namespace Loki
// };
////////////////////////////////////////////////////////////////////////////////
- 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;
- };
+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;
+};
////////////////////////////////////////////////////////////////////////////////
@@ -203,29 +203,29 @@ namespace Loki
// functions)
////////////////////////////////////////////////////////////////////////////////
- template <class TList, typename R = void> class BaseVisitorImpl;
+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&)
+ { return R(); }
+};
+
+template <class Head, typename R>
+class BaseVisitorImpl<Typelist<Head, NullType>, R>
+ : public Visitor<Head, R>
+{
+public:
+ virtual R Visit(Head&)
+ { return R(); }
+};
- 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&)
- { return R(); }
- };
-
- template <class Head, typename R>
- class BaseVisitorImpl<Typelist<Head, NullType>, R>
- : public Visitor<Head, R>
- {
- public:
- virtual R Visit(Head&)
- { return R(); }
- };
-
////////////////////////////////////////////////////////////////////////////////
// class template BaseVisitable
////////////////////////////////////////////////////////////////////////////////
@@ -241,61 +241,61 @@ struct DefaultCatchAll
// class template BaseVisitable
////////////////////////////////////////////////////////////////////////////////
- template
- <
- typename R = void,
- template <typename, class> class CatchAll = DefaultCatchAll,
- bool ConstVisitable = false
- >
- class BaseVisitable;
+template
+<
+typename R = void,
+ template <typename, class> class CatchAll = DefaultCatchAll,
+ bool ConstVisitable = false
+ >
+class BaseVisitable;
- template<typename R,template <typename, class> class CatchAll>
- class BaseVisitable<R, CatchAll, false>
+template<typename R,template <typename, class> class CatchAll>
+class BaseVisitable<R, CatchAll, false>
+{
+public:
+ typedef R ReturnType;
+ virtual ~BaseVisitable() {}
+ virtual ReturnType Accept(BaseVisitor&) = 0;
+
+protected: // give access only to the hierarchy
+ template <class T>
+ static ReturnType AcceptImpl(T& visited, BaseVisitor& guest)
{
- public:
- typedef R ReturnType;
- virtual ~BaseVisitable() {}
- virtual ReturnType Accept(BaseVisitor&) = 0;
-
- protected: // give access only to the hierarchy
- template <class T>
- static ReturnType AcceptImpl(T& visited, BaseVisitor& guest)
+ // Apply the Acyclic Visitor
+ if (Visitor<T,R>* p = dynamic_cast<Visitor<T,R>*>(&guest))
{
- // Apply the Acyclic Visitor
- if (Visitor<T,R>* p = dynamic_cast<Visitor<T,R>*>(&guest))
- {
- return p->Visit(visited);
- }
- return CatchAll<R, T>::OnUnknownVisitor(visited, guest);
+ return p->Visit(visited);
}
- };
+ return CatchAll<R, T>::OnUnknownVisitor(visited, guest);
+ }
+};
- template<typename R,template <typename, class> class CatchAll>
- class BaseVisitable<R, CatchAll, true>
+template<typename R,template <typename, class> class CatchAll>
+class BaseVisitable<R, CatchAll, 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, BaseVisitor& guest)
{
- 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, BaseVisitor& guest)
+ // Apply the Acyclic Visitor
+ if (Visitor<T,R,true>* p = dynamic_cast<Visitor<T,R,true>*>(&guest))
{
- // Apply the Acyclic Visitor
- if (Visitor<T,R,true>* p = dynamic_cast<Visitor<T,R,true>*>(&guest))
- {
- return p->Visit(visited);
- }
- return CatchAll<R, T>::OnUnknownVisitor(const_cast<T&>(visited), guest);
+ return p->Visit(visited);
}
- };
+ return CatchAll<R, T>::OnUnknownVisitor(const_cast<T&>(visited), guest);
+ }
+};
////////////////////////////////////////////////////////////////////////////////
/// \def LOKI_DEFINE_VISITABLE()
/// \ingroup VisitorGroup
-/// Put it in every class that you want to make visitable
+/// Put it in every class that you want to make visitable
/// (in addition to deriving it from BaseVisitable<R>)
////////////////////////////////////////////////////////////////////////////////
@@ -306,7 +306,7 @@ struct DefaultCatchAll
////////////////////////////////////////////////////////////////////////////////
/// \def LOKI_DEFINE_CONST_VISITABLE()
/// \ingroup VisitorGroup
-/// Put it in every class that you want to make visitable by const member
+/// Put it in every class that you want to make visitable by const member
/// functions (in addition to deriving it from BaseVisitable<R>)
////////////////////////////////////////////////////////////////////////////////
@@ -318,25 +318,25 @@ struct DefaultCatchAll
/// \class CyclicVisitor
///
/// \ingroup VisitorGroup
-/// Put it in every class that you want to make visitable (in addition to
+/// 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>
+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)
{
- 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);
- }
- };
-
+ Visitor<Visited, ReturnType>& subObj = *this;
+ return subObj.Visit(host);
+ }
+};
+
////////////////////////////////////////////////////////////////////////////////
/// \def LOKI_DEFINE_CYCLIC_VISITABLE(SomeVisitor)
/// \ingroup VisitorGroup
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