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June 20, 2001 revision:

Browse source 
* ported by Nick Thurn to gcc
* many bug fixes


git-svn-id: svn://svn.code.sf.net/p/loki-lib/code/trunk@7 7ec92016-0320-0410-acc4-a06ded1c099a
This commit is contained in:
aandrei 2001-11-21 09:31:45 +00:00
parent 2ffd6b016f
commit 1fadda9836
24 changed files with 612 additions and 686 deletions
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54
Visitor.h
View file

@ -13,7 +13,7 @@
// without express or implied warranty.
////////////////////////////////////////////////////////////////////////////////
// Last update: February 19, 2001
// Last update: June 20, 2001
#ifndef VISITOR_INC_
#define VISITOR_INC_
@ -66,20 +66,20 @@ namespace Loki
template <class Head, class Tail, typename R>
class Visitor<Typelist<Head, Tail>, R>
: public Visitor<Head>, public Visitor<Tail>
: public Visitor<Head, R>, public Visitor<Tail, R>
{
public:
typedef R ReturnType;
using Visitor<Head>::Visit;
using Visitor<Tail>::Visit;
// using Visitor<Head, R>::Visit;
// using Visitor<Tail, R>::Visit;
};
template <class Head, typename R>
class Visitor<Typelist<Head, NullType>, R> : public Visitor<Head>
class Visitor<Typelist<Head, NullType>, R> : public Visitor<Head, R>
{
public:
typedef R ReturnType;
using Visitor<Head>::Visit;
using Visitor<Head, R>::Visit;
};
////////////////////////////////////////////////////////////////////////////////
@ -96,7 +96,7 @@ namespace Loki
, public BaseVisitorImpl<Tail, R>
{
public:
using BaseVisitorImpl<Tail, R>::Visit;
// using BaseVisitorImpl<Tail, R>::Visit;
virtual R Visit(Head&)
{ return R(); }
@ -126,7 +126,11 @@ struct DefaultCatchAll
// class template BaseVisitable
////////////////////////////////////////////////////////////////////////////////
template <typename R = void, template <typename, class> class CatchAll>
template
<
typename R = void,
template <typename, class> class CatchAll = DefaultCatchAll
>
class BaseVisitable
{
public:
@ -157,23 +161,6 @@ struct DefaultCatchAll
virtual ReturnType Accept(BaseVisitor& guest) \
{ return AcceptImpl(*this, guest); }
////////////////////////////////////////////////////////////////////////////////
// class template VisitorBinder
// Helper for CyclicVisitor below
////////////////////////////////////////////////////////////////////////////////
namespace Private
{
template <typename R>
struct VisitorBinder
{
template <class T>
struct Result : public Visitor<T, R>
{
};
};
}
////////////////////////////////////////////////////////////////////////////////
// class template CyclicVisitor
// Put it in every class that you want to make visitable (in addition to
@ -181,18 +168,16 @@ struct DefaultCatchAll
////////////////////////////////////////////////////////////////////////////////
template <typename R, class TList>
class CyclicVisitor
: public GenScatterHierarchy<TList, Private::VisitorBinder<R>::Result>
class CyclicVisitor : public Visitor<TList, R>
{
public:
typedef R ReturnType;
// using Visitor<TList, R>::Visit;
// this is GenericVisit and not Visit to avoid the compiler warning
// "Visit hides virtual function in base class"
template <class Visited>
ReturnType GenericVisit(Visited& host)
{
Visitor<Visited>& subObj = *this;
Visitor<Visited, ReturnType>& subObj = *this;
return subObj.Visit(host);
}
};
@ -208,4 +193,11 @@ struct DefaultCatchAll
} // namespace Loki
#endif // VISITOR_INC_
////////////////////////////////////////////////////////////////////////////////
// Change log:
// March 20: add default argument DefaultCatchAll to BaseVisitable
// June 20, 2001: ported by Nick Thurn to gcc 2.95.3. Kudos, Nick!!!
////////////////////////////////////////////////////////////////////////////////
#endif // VISITOR_INC_