vtkAbstractArray.h File Reference

#include "vtkCommonCoreModule.h"
#include "vtkObject.h"
#include "vtkVariant.h"

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Classes
class	vtkAbstractArray
	Abstract superclass for all arrays. More...
struct	vtkArrayDownCast_impl< ArrayT >
	Implementation of vtkArrayDownCast. More...

Macros
#define	vtkArrayDownCast_FastCastMacro(ArrayT)
	This macro is used to tell vtkArrayDownCast to use FastDownCast instead of SafeDownCast. More...
#define	vtkArrayDownCast_TemplateFastCastMacro(ArrayT)
	Same as vtkArrayDownCast_FastCastMacro, but treats ArrayT as a single-parameter template (the parameter is the value type). More...

Functions
template<typename ArrayT >
ArrayT *	vtkArrayDownCast (vtkAbstractArray *array)
	vtkArrayDownCast is to be used by generic (e.g. More...

Macro Definition Documentation

vtkArrayDownCast_FastCastMacro

#define vtkArrayDownCast_FastCastMacro

(

ArrayT

)

Value:

  template <>                                                                                      \
  struct vtkArrayDownCast_impl<ArrayT>                                                             \
  {                                                                                                \
    inline ArrayT* operator()(vtkAbstractArray* array) { return ArrayT::FastDownCast(array); }     \
  }

This macro is used to tell vtkArrayDownCast to use FastDownCast instead of SafeDownCast.

Definition at line 741 of file vtkAbstractArray.h.

vtkArrayDownCast_TemplateFastCastMacro

#define vtkArrayDownCast_TemplateFastCastMacro

(

ArrayT

)

Value:

  template <typename ValueT>                                                                       \
  struct vtkArrayDownCast_impl<ArrayT<ValueT>>                                                     \
  {                                                                                                \
    inline ArrayT<ValueT>* operator()(vtkAbstractArray* array)                                     \
    {                                                                                              \
      return ArrayT<ValueT>::FastDownCast(array);                                                  \
    }                                                                                              \
  }

Same as vtkArrayDownCast_FastCastMacro, but treats ArrayT as a single-parameter template (the parameter is the value type).

Defines a vtkArrayDownCast implementation that uses the specified array template class with any value type.

Definition at line 756 of file vtkAbstractArray.h.

Function Documentation

vtkArrayDownCast()

template<typename ArrayT >

ArrayT * vtkArrayDownCast

(

vtkAbstractArray *

array

)

vtkArrayDownCast is to be used by generic (e.g.

templated) code for quickly downcasting vtkAbstractArray pointers to more derived classes. The typical VTK downcast pattern (SafeDownCast) performs a string comparison on the class names in the object's inheritance hierarchy, which is quite expensive and can dominate computational resource usage when downcasting is needed in a worker function. To address this, certain arrays support a FastDownCast method, which replaces the chain of string comparisons with 1-2 integer comparisons and thus is significantly more efficient. However, not all arrays support the FastDownCast mechanism. vtkArrayDownCast exists to select between the two; Arrays that support FastDownCast will use it, while others will fallback to the slower SafeDownCast.

A more detailed description of this class and related tools can be found here.

Definition at line 729 of file vtkAbstractArray.h.