A fancy ArrayHandle that can be used to modify the results from one or more source ArrayHandle. More...

#include <ArrayHandleDecorator.h>

Inheritance diagram for vtkm::cont::ArrayHandleDecorator< DecoratorImplT, ArrayTs >:

Public Types
using	Thisclass = typename vtkm::cont::detail::GetTypeInParentheses< void(ArrayHandleDecorator< typename std::decay< DecoratorImplT >::type, typename std::decay< ArrayTs >::type... >) >::type

using	Superclass = typename vtkm::cont::detail::GetTypeInParentheses< void(typename Traits::Superclass) >::type

using	ValueType = typename Superclass::ValueType

using	StorageTag = typename Superclass::StorageTag

using	StorageType = typename Superclass::StorageType

using	ReadPortalType = typename Superclass::ReadPortalType

using	WritePortalType = typename Superclass::WritePortalType

Public Types inherited from vtkm::cont::ArrayHandle< T, StorageTag_ >
using	ValueType = T

using	StorageTag = StorageTag_

using	StorageType = vtkm::cont::internal::Storage< ValueType, StorageTag >

using	ReadPortalType = typename StorageType::ReadPortalType

using	WritePortalType = typename StorageType::WritePortalType

Public Member Functions
	ArrayHandleDecorator ()

VTKM_CONT	ArrayHandleDecorator (const Thisclass &src)

VTKM_CONT	ArrayHandleDecorator (Thisclass &&src) noexcept

VTKM_CONT	ArrayHandleDecorator (const vtkm::cont::ArrayHandle< typename Superclass::ValueType, typename Superclass::StorageTag > &src)

VTKM_CONT	ArrayHandleDecorator (vtkm::cont::ArrayHandle< typename Superclass::ValueType, typename Superclass::StorageTag > &&src) noexcept

VTKM_CONT	ArrayHandleDecorator (const std::vector< vtkm::cont::internal::Buffer > &buffers)

VTKM_CONT	ArrayHandleDecorator (std::vector< vtkm::cont::internal::Buffer > &&buffers) noexcept

VTKM_CONT Thisclass &	operator= (const Thisclass &src)

VTKM_CONT Thisclass &	operator= (Thisclass &&src) noexcept

	ArrayHandleDecorator (vtkm::Id numValues, const typename std::decay< DecoratorImplT >::type &impl, const typename std::decay< ArrayTs >::type &... arrays)

Public Member Functions inherited from vtkm::cont::ArrayHandle< T, StorageTag_ >
	ArrayHandle ()
	Constructs an empty ArrayHandle. More...

	ArrayHandle (const vtkm::cont::ArrayHandle< ValueType, StorageTag > &src)
	Copy constructor. More...

	ArrayHandle (vtkm::cont::ArrayHandle< ValueType, StorageTag > &&src) noexcept
	Move constructor. More...

	ArrayHandle (const std::vector< vtkm::cont::internal::Buffer > &buffers)
	Special constructor for subclass specializations that need to set the initial state array. More...

	ArrayHandle (std::vector< vtkm::cont::internal::Buffer > &&buffers) noexcept
	Special constructor for subclass specializations that need to set the initial state array. More...

	~ArrayHandle ()
	Destructs an empty ArrayHandle. More...

vtkm::cont::ArrayHandle< ValueType, StorageTag > &	operator= (const vtkm::cont::ArrayHandle< ValueType, StorageTag > &src)
	Shallow copies an ArrayHandle. More...

vtkm::cont::ArrayHandle< ValueType, StorageTag > &	operator= (vtkm::cont::ArrayHandle< ValueType, StorageTag > &&src) noexcept
	Move and Assignment of an ArrayHandle. More...

bool	operator== (const ArrayHandle< ValueType, StorageTag > &rhs) const
	Like a pointer, two `ArrayHandle`s are considered equal if they point to the same location in memory. More...

bool	operator!= (const ArrayHandle< ValueType, StorageTag > &rhs) const

template<typename VT , typename ST >
bool	operator== (const ArrayHandle< VT, ST > &) const

template<typename VT , typename ST >
bool	operator!= (const ArrayHandle< VT, ST > &) const

StorageType	GetStorage () const
	Get the storage. More...

ReadPortalType	ReadPortal () const
	Get an array portal that can be used in the control environment. More...

ReadPortalType	ReadPortal (vtkm::cont::Token &token) const

WritePortalType	WritePortal () const
	Get an array portal that can be used in the control environment. More...

WritePortalType	WritePortal (vtkm::cont::Token &token) const
	Get an array portal that can be used in the control environment. More...

vtkm::Id	GetNumberOfValues () const
	Returns the number of entries in the array. More...

vtkm::IdComponent	GetNumberOfComponentsFlat () const
	Returns the total number of components for each value in the array. More...

void	Allocate (vtkm::Id numberOfValues, vtkm::CopyFlag preserve, vtkm::cont::Token &token) const
	Allocates an array large enough to hold the given number of values. More...

void	Allocate (vtkm::Id numberOfValues, vtkm::CopyFlag preserve=vtkm::CopyFlag::Off) const
	Allocates an array large enough to hold the given number of values. More...

void	AllocateAndFill (vtkm::Id numberOfValues, const ValueType &fillValue, vtkm::CopyFlag preserve, vtkm::cont::Token &token) const
	Allocates an array and fills it with an initial value. More...

void	AllocateAndFill (vtkm::Id numberOfValues, const ValueType &fillValue, vtkm::CopyFlag preserve=vtkm::CopyFlag::Off) const
	Allocates an array and fills it with an initial value. More...

void	Fill (const ValueType &fillValue, vtkm::Id startIndex, vtkm::Id endIndex, vtkm::cont::Token &token) const
	Fills the array with a given value. More...

void	Fill (const ValueType &fillValue, vtkm::Id startIndex, vtkm::Id endIndex) const
	Fills the array with a given value. More...

void	Fill (const ValueType &fillValue, vtkm::Id startIndex=0) const
	Fills the array with a given value. More...

void	ReleaseResourcesExecution () const
	Releases any resources being used in the execution environment (that are not being shared by the control environment). More...

void	ReleaseResources () const
	Releases all resources in both the control and execution environments. More...

ReadPortalType	PrepareForInput (vtkm::cont::DeviceAdapterId device, vtkm::cont::Token &token) const
	Prepares this array to be used as an input to an operation in the execution environment. More...

WritePortalType	PrepareForInPlace (vtkm::cont::DeviceAdapterId device, vtkm::cont::Token &token) const
	Prepares this array to be used in an in-place operation (both as input and output) in the execution environment. More...

WritePortalType	PrepareForOutput (vtkm::Id numberOfValues, vtkm::cont::DeviceAdapterId device, vtkm::cont::Token &token) const
	Prepares (allocates) this array to be used as an output from an operation in the execution environment. More...

bool	IsOnDevice (vtkm::cont::DeviceAdapterId device) const
	Returns true if the ArrayHandle's data is on the given device. More...

bool	IsOnHost () const
	Returns true if the ArrayHandle's data is on the host. More...

void	SyncControlArray () const
	Synchronizes the control array with the execution array. More...

void	Enqueue (const vtkm::cont::Token &token) const
	Enqueue a token for access to this ArrayHandle. More...

void	DeepCopyFrom (const vtkm::cont::ArrayHandle< ValueType, StorageTag > &source) const
	Deep copies the data in the array. More...

const std::vector< vtkm::cont::internal::Buffer > &	GetBuffers () const
	Returns the internal `Buffer` structures that hold the data. More...

std::vector< vtkm::cont::internal::Buffer > &	GetBuffers ()

Private Types
using	Traits = internal::DecoratorHandleTraits< typename std::decay< DecoratorImplT >::type, typename std::decay< ArrayTs >::type... >

Additional Inherited Members
Protected Member Functions inherited from vtkm::cont::ArrayHandle< T, StorageTag_ >
void	SetBuffer (vtkm::IdComponent index, const vtkm::cont::internal::Buffer &buffer)

void	SetBuffers (const std::vector< vtkm::cont::internal::Buffer > &buffers)

void	SetBuffers (std::vector< vtkm::cont::internal::Buffer > &&buffers)

Detailed Description

template<typename DecoratorImplT, typename... ArrayTs>
class vtkm::cont::ArrayHandleDecorator< DecoratorImplT, ArrayTs >

A fancy ArrayHandle that can be used to modify the results from one or more source ArrayHandle.

ArrayHandleDecorator is given a DecoratorImplT class and a list of one or more source ArrayHandles. There are no restrictions on the size or type of the source ArrayHandles.

The decorator implementation class is described below:

struct ExampleDecoratorImplementation
{
 
  // Takes one portal for each source array handle (only two shown).
  // Returns a functor that defines:
  //
  // VTKM_EXEC_CONT ValueType operator()(vtkm::Id id) const;
  //
  // which takes an index and returns a value which should be produced by
  // the source arrays somehow. This ValueType will be the ValueType of the
  // ArrayHandleDecorator.
  //
  // Both SomeFunctor::operator() and CreateFunctor must be const.
  //
  template <typename Portal1Type, typename Portal2Type>
  VTKM_CONT
  SomeFunctor CreateFunctor(Portal1Type portal1, Portal2Type portal2) const;
 
  // Takes one portal for each source array handle (only two shown).
  // Returns a functor that defines:
  //
  // VTKM_EXEC_CONT void operator()(vtkm::Id id, ValueType val) const;
  //
  // which takes an index and a value, which should be used to modify one
  // or more of the source arrays.
  //
  // CreateInverseFunctor is optional; if not provided, the
  // ArrayHandleDecorator will be read-only. In addition, if all of the
  // source ArrayHandles are read-only, the inverse functor will not be used
  // and the ArrayHandleDecorator will be read only.
  //
  // Both SomeInverseFunctor::operator() and CreateInverseFunctor must be
  // const.
  //
  template <typename Portal1Type, typename Portal2Type>
  VTKM_CONT
  SomeInverseFunctor CreateInverseFunctor(Portal1Type portal1,
                                          Portal2Type portal2) const;
 
  // Given a set of ArrayHandles and a size, implement what should happen
  // to the source ArrayHandles when Allocate() is called on the decorator
  // handle.
  //
  // AllocateSourceArrays is optional; if not provided, the
  // ArrayHandleDecorator will throw if its Allocate method is called. If
  // an implementation is present and doesn't throw, the
  // ArrayHandleDecorator's internal state is updated to show `size` as the
  // number of values.
  template <typename Array1Type, typename Array2Type>
  VTKM_CONT
  void AllocateSourceArrays(vtkm::Id size,
                            vtkm::CopyFlag preserve,
                            vtkm::cont::Token& token,
                            Array1Type array1,
                            Array2Type array2) const;
 
};

There are several example DecoratorImpl classes provided in the UnitTestArrayHandleDecorator test file.