vtkDispatcher< BaseLhs, ReturnType, CastingPolicy > Class Template Reference

Dispatch to functor based on a pointer type. More...

#include <vtkDispatcher.h>

Public Member Functions
template<class SomeLhs , class Functor >
void	Add (Functor fun)
	Add in a functor that is mapped to the template SomeLhs parameter.
template<class SomeLhs >
bool	Remove ()
	Remove a functor that is bound to the given parameter type.
ReturnType	Go (BaseLhs *lhs)
	Given a pointer to an object that derives from the BaseLhs we find the matching functor that was added, and call it passing along the given parameter.

Protected Types
typedef vtkDispatcherCommon::TypeInfo	TypeInfo
typedef vtkDispatcherPrivate::Functor< ReturnType, BaseLhs >	MappedType
typedef std::map< TypeInfo, MappedType >	MapType

Protected Member Functions
void	DoAddFunctor (TypeInfo lhs, MappedType fun)
bool	DoRemove (TypeInfo lhs)

Protected Attributes
MapType	FunctorMap

Detailed Description

template<class BaseLhs, typename ReturnType = void, template< class, class > class CastingPolicy = vtkDispatcherCommon::vtkCaster>
class vtkDispatcher< BaseLhs, ReturnType, CastingPolicy >

Dispatch to functor based on a pointer type.

vtkDispatcher is a class that allows calling a functor based on the derived types of a pointer. This form of dynamic dispatching allows the conversion of runtime polymorphism to a compile time polymorphism. For example it can be used as a replacement for the vtkTemplateMacro, with bonus of being easier to understand

Note: By default the return type is void.

The functors that are passed around can contain state, and are allowed to be const or non const. If you are using a functor that does have state, make sure your copy constructor is correct.

struct functor{
  template<typename T>
  void operator()(T& t) const
  {
 
  }
};
 
Here is an example of using the dispatcher.
 \code
 statefull functor;
 vtkDispatcher<vtkDataArray> dispatcher;
 dispatcher.Add<vtkCharArray>(&functor);
 dispatcher.Add<vtkDoubleArray>(&functor);
 dispatcher.Add<vtkIdTypeArray>(&functor);
 dispatcher.Add<vtkIntArray>(&functor);
 dispatcher.Add<vtkFloatArray>(&functor);
 dispatcher.Go(ptr1);

See also

vtkDispatcher

Definition at line 88 of file vtkDispatcher.h.

Member Typedef Documentation

TypeInfo

template<class BaseLhs , typename ReturnType = void, template< class, class > class CastingPolicy = vtkDispatcherCommon::vtkCaster>

typedef vtkDispatcherCommon::TypeInfo vtkDispatcher< BaseLhs, ReturnType, CastingPolicy >::TypeInfo

protected

Definition at line 141 of file vtkDispatcher.h.

MappedType

template<class BaseLhs , typename ReturnType = void, template< class, class > class CastingPolicy = vtkDispatcherCommon::vtkCaster>

typedef vtkDispatcherPrivate::Functor<ReturnType, BaseLhs> vtkDispatcher< BaseLhs, ReturnType, CastingPolicy >::MappedType

protected

Definition at line 142 of file vtkDispatcher.h.

MapType

template<class BaseLhs , typename ReturnType = void, template< class, class > class CastingPolicy = vtkDispatcherCommon::vtkCaster>

typedef std::map<TypeInfo, MappedType> vtkDispatcher< BaseLhs, ReturnType, CastingPolicy >::MapType

protected

Definition at line 146 of file vtkDispatcher.h.

Member Function Documentation

Add()

template<class BaseLhs , typename ReturnType = void, template< class, class > class CastingPolicy = vtkDispatcherCommon::vtkCaster>

template<class SomeLhs , class Functor >

void vtkDispatcher< BaseLhs, ReturnType, CastingPolicy >::Add ( Functor  fun )

inline

Add in a functor that is mapped to the template SomeLhs parameter.

When instances of the parameter is passed in on the Go method we will call the functor and pass along the given parameter. Note: This copies the functor so pass stateful functors by pointer.

vtkDispatcher<vtkDataModel> dispatcher;
dispatcher.Add<vtkImageData>(exampleFunctor());
dispatcher.Add<vtkImageData>(&exampleFunctorWithState);

Definition at line 104 of file vtkDispatcher.h.

Remove()

template<class BaseLhs , typename ReturnType = void, template< class, class > class CastingPolicy = vtkDispatcherCommon::vtkCaster>

template<class SomeLhs >

bool vtkDispatcher< BaseLhs, ReturnType, CastingPolicy >::Remove ( )

inline

Remove a functor that is bound to the given parameter type.

Will return true if we did remove a functor.

Definition at line 115 of file vtkDispatcher.h.

Go()

template<class BaseLhs , typename ReturnType , template< class, class > class CastingPolicy>

ReturnType vtkDispatcher< BaseLhs, ReturnType, CastingPolicy >::Go

(

BaseLhs *

lhs

)

Given a pointer to an object that derives from the BaseLhs we find the matching functor that was added, and call it passing along the given parameter.

It should be noted that the functor will be called with the parameter being the derived type that Functor was registered with.

Note: This will only find exact matches. So if you add functor to find vtkDataArray, it will not be called if passed with a vtkDoubleArray.

vtkDispatcher<vtkDataArray> dispatcher;
dispatcher.Add(vtkFloatArray>(floatFunctor())
dispatcher.Add(vtkDoubleArray>(doubleFunctor())
dispatcher.Go(dataArray1);
dispatcher.Go(dataArray2);

Definition at line 204 of file vtkDispatcher.h.

DoAddFunctor()

template<class BaseLhs , typename ReturnType , template< class, class > class CastingPolicy>

void vtkDispatcher< BaseLhs, ReturnType, CastingPolicy >::DoAddFunctor ( TypeInfo  lhs, MappedType  fun  )

protected

Definition at line 188 of file vtkDispatcher.h.

DoRemove()

template<class BaseLhs , typename ReturnType , template< class, class > class CastingPolicy>

bool vtkDispatcher< BaseLhs, ReturnType, CastingPolicy >::DoRemove ( TypeInfo  lhs )

protected

Definition at line 196 of file vtkDispatcher.h.

Member Data Documentation

FunctorMap

template<class BaseLhs , typename ReturnType = void, template< class, class > class CastingPolicy = vtkDispatcherCommon::vtkCaster>

MapType vtkDispatcher< BaseLhs, ReturnType, CastingPolicy >::FunctorMap

protected

Definition at line 147 of file vtkDispatcher.h.

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The documentation for this class was generated from the following file:

• Common/DataModel/vtkDispatcher.h