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
	vtkIndexedImplicitBackend (vtkIdList *indexes, vtkDataArray *array)
	Constructor.
	vtkIndexedImplicitBackend (vtkDataArray *indexes, vtkDataArray *array)
	Constructor.

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

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

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