vtkIndexedImplicitBackend< ValueType > Class Template Reference

A backend for the vtkImplicitArray framework allowing one to use a subset of a given data array, by providing a vtkIdList or vtkDataArray of indexes as indirection, as another vtkDataArray without any excess memory consumption. More...

#include <vtkIndexedImplicitBackend.h>

Public Member Functions
	~vtkIndexedImplicitBackend ()
ValueType	operator() (int idx) const
	Indexing operation for the indexed array respecting the backend expectations of vtkImplicitArray More...
unsigned long	getMemorySize () const
	Returns the smallest integer memory size in KiB needed to store the array. More...
	vtkIndexedImplicitBackend (vtkIdList *indexes, vtkDataArray *array)
	Constructor. More...
	vtkIndexedImplicitBackend (vtkDataArray *indexes, vtkDataArray *array)
	Constructor. More...

Detailed Description

template<typename ValueType>
class vtkIndexedImplicitBackend< ValueType >

A backend for the vtkImplicitArray framework allowing one to use a subset of a given data array, by providing a vtkIdList or vtkDataArray of indexes as indirection, as another vtkDataArray without any excess memory consumption.

This structure can be classified as a closure and can be called using syntax similar to a function call.

An example of potential usage in a vtkImplicitArray:

vtkNew<vtkIntArray> baseArray;
baseArray->SetNumberOfComponents(1);
baseArray->SetNumberOfTuples(100);
auto range = vtk::DataArrayValueRange<1>(baseArray);
std::iota(range.begin(), range.end(), 0);
 
vtkNew<vtkIdList> handles;
handles->SetNumberOfIds(100);
for (vtkIdType idx = 0; idx < 100; idx++)
{
  handles->SetId(idx, 99-idx);
}
 
vtkNew<vtkImplicitArray<vtkIndexedImplicitBackend<int>>> indexedArr; // More compact with
                                                                     // `vtkIndexedArray<int>`
                                                                     // if available
indexedArr->SetBackend(std::make_shared<vtkIndexedImplicitBackend<int>>(handles, baseArray));
indexedArr->SetNumberOfComponents(1);
indexedArr->SetNumberOfTuples(100);
CHECK(indexedArr->GetValue(57) == 42);

See also

vtkImplicitArray, vtkIndexedArray

Definition at line 53 of file vtkIndexedImplicitBackend.h.

Constructor & Destructor Documentation

vtkIndexedImplicitBackend() [1/2]

template<typename ValueType >

vtkIndexedImplicitBackend< ValueType >::vtkIndexedImplicitBackend	(	vtkIdList *	indexes,
		vtkDataArray *	array
	)

Constructor.

Parameters

indexes	list of indexes to use for indirection of the array
array	base array of interest

vtkIndexedImplicitBackend() [2/2]

template<typename ValueType >

vtkIndexedImplicitBackend< ValueType >::vtkIndexedImplicitBackend	(	vtkDataArray *	indexes,
		vtkDataArray *	array
	)

Constructor.

Parameters

indexes	list of indexes to use for indirection of the array
array	base array of interest

~vtkIndexedImplicitBackend()

template<typename ValueType >

vtkIndexedImplicitBackend< ValueType >::~vtkIndexedImplicitBackend

(

)

Member Function Documentation

operator()()

template<typename ValueType >

ValueType vtkIndexedImplicitBackend< ValueType >::operator()

(

int

idx

)

const

Indexing operation for the indexed array respecting the backend expectations of vtkImplicitArray

getMemorySize()

template<typename ValueType >

unsigned long vtkIndexedImplicitBackend< ValueType >::getMemorySize

(

)

const

Returns the smallest integer memory size in KiB needed to store the array.

Used to implement GetActualMemorySize on vtkIndexedImplicitBackend.

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

• Common/Core/vtkImplicitArray.h
• Common/Core/vtkIndexedImplicitBackend.h