mirror of
https://gitlab.kitware.com/vtk/vtk-m
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346 lines
12 KiB
C++
346 lines
12 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//
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// Copyright 2014 Sandia Corporation.
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// Copyright 2014 UT-Battelle, LLC.
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// Copyright 2014. Los Alamos National Security
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//
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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// the U.S. Government retains certain rights in this software.
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//
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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//============================================================================
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#ifndef vtk_m_cont_DynamicArrayHandle_h
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#define vtk_m_cont_DynamicArrayHandle_h
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#include <vtkm/TypeListTag.h>
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#include <vtkm/cont/ArrayHandle.h>
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#include <vtkm/cont/ErrorControlBadValue.h>
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#include <vtkm/cont/StorageListTag.h>
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#include <vtkm/cont/internal/DynamicTransform.h>
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#include <vtkm/cont/internal/SimplePolymorphicContainer.h>
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#include <boost/smart_ptr/shared_ptr.hpp>
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#include <boost/utility/enable_if.hpp>
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namespace vtkm {
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namespace cont {
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namespace internal {
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/// Behaves like (and is interchangable with) a DynamicArrayHandle. The
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/// difference is that the list of types and list of storage to try when
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/// calling CastAndCall is set to the class template arguments.
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///
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template<typename TypeList, typename StorageList>
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class DynamicArrayHandleCast;
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} // namespace internal
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/// \brief Holds an array handle without having to specify template parameters.
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///
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/// \c DynamicArrayHandle holds an \c ArrayHandle object using runtime
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/// polymorphism to manage different value types and storage rather than
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/// compile-time templates. This adds a programming convienience that helps
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/// avoid a proliferation of templates. It also provides the management
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/// necessary to interface VTK-m with data sources where types will not be
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/// known until runtime.
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///
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/// To interface between the runtime polymorphism and the templated algorithms
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/// in VTK-m, \c DynamicArrayHandle contains a method named \c CastAndCall that
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/// will determine the correct type from some known list of types and storage
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/// objects. This mechanism is used internally by VTK-m's worklet invocation
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/// mechanism to determine the type when running algorithms.
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///
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/// By default, \c DynamicArrayHandle will assume that the value type in the
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/// array matches one of the types specified by \c VTKM_DEFAULT_TYPE_LIST_TAG
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/// and the storage matches one of the tags specified by \c
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/// VTKM_DEFAULT_STORAGE_LIST_TAG. These lists can be changed by using the \c
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/// ResetTypeList and \c ResetStorageList methods, respectively. It is
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/// worthwhile to match these lists closely to the possible types that might be
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/// used. If a type is missing you will get a runtime error. If there are more
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/// types than necessary, then the template mechanism will create a lot of
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/// object code that is never used, and keep in mind that the number of
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/// combinations grows exponentally when using multiple \c DynamicArrayHandle
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/// objects.
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///
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class DynamicArrayHandle
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{
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public:
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VTKM_CONT_EXPORT
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DynamicArrayHandle() { }
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template<typename Type, typename Storage>
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VTKM_CONT_EXPORT
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DynamicArrayHandle(const vtkm::cont::ArrayHandle<Type,Storage> &array)
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: ArrayStorage(new vtkm::cont::internal::SimplePolymorphicContainer<
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vtkm::cont::ArrayHandle<Type,Storage> >(array))
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{ }
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template<typename TypeList, typename StorageList>
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VTKM_CONT_EXPORT
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DynamicArrayHandle(
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const internal::DynamicArrayHandleCast<TypeList,StorageList> &dynamicArray)
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: ArrayStorage(dynamicArray.ArrayStorage) { }
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/// Returns true if this array is of the provided type and uses the provided
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/// storage.
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///
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template<typename Type, typename Storage>
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VTKM_CONT_EXPORT
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bool IsTypeAndStorage(Type = Type(), Storage = Storage()) const {
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return (this->TryCastStorage<Type,Storage>() != NULL);
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}
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/// Returns this array cast to an ArrayHandle object of the given type and
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/// storage. Throws ErrorControlBadValue if the cast does not work. Use
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/// IsTypeAndStorage to check if the cast can happen.
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///
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template<typename Type, typename Storage>
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VTKM_CONT_EXPORT
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vtkm::cont::ArrayHandle<Type, Storage>
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CastToArrayHandle(Type = Type(), Storage = Storage()) const {
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vtkm::cont::internal::SimplePolymorphicContainer<
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vtkm::cont::ArrayHandle<Type,Storage> > *container =
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this->TryCastStorage<Type,Storage>();
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if (container == NULL)
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{
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throw vtkm::cont::ErrorControlBadValue("Bad cast of dynamic array.");
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}
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return container->Item;
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}
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/// Changes the types to try casting to when resolving this dynamic array,
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/// which is specified with a list tag like those in TypeListTag.h. Since C++
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/// does not allow you to actually change the template arguments, this method
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/// returns a new dynamic array object. This method is particularly useful to
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/// narrow down (or expand) the types when using an array of particular
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/// constraints.
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///
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template<typename NewTypeList>
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VTKM_CONT_EXPORT
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internal::DynamicArrayHandleCast<NewTypeList,VTKM_DEFAULT_STORAGE_LIST_TAG>
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ResetTypeList(NewTypeList = NewTypeList()) const {
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VTKM_IS_LIST_TAG(NewTypeList);
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return internal::DynamicArrayHandleCast<
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NewTypeList,VTKM_DEFAULT_STORAGE_LIST_TAG>(*this);
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}
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/// Changes the array storage types to try casting to when resolving this
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/// dynamic array, which is specified with a list tag like those in
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/// StorageListTag.h. Since C++ does not allow you to actually change the
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/// template arguments, this method returns a new dynamic array object. This
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/// method is particularly useful to narrow down (or expand) the types when
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/// using an array of particular constraints.
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///
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template<typename NewStorageList>
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VTKM_CONT_EXPORT
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internal::DynamicArrayHandleCast<VTKM_DEFAULT_TYPE_LIST_TAG,NewStorageList>
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ResetStorageList(NewStorageList = NewStorageList()) const {
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VTKM_IS_LIST_TAG(NewStorageList);
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return internal::DynamicArrayHandleCast<
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VTKM_DEFAULT_TYPE_LIST_TAG,NewStorageList>(*this);
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}
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/// Attempts to cast the held array to a specific value type and storage,
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/// then call the given functor with the cast array. The types and storage
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/// tried in the cast are those in the lists defined by
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/// VTKM_DEFAULT_TYPE_LIST_TAG and VTK_DEFAULT_STORAGE_LIST_TAG,
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/// respectively, unless they have been changed with a previous call to
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/// ResetTypeList or ResetStorageList.
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///
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template<typename Functor>
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VTKM_CONT_EXPORT
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void CastAndCall(const Functor &f) const
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{
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this->CastAndCall(
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f, VTKM_DEFAULT_TYPE_LIST_TAG(), VTKM_DEFAULT_STORAGE_LIST_TAG());
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}
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/// A version of CastAndCall that tries specified lists of types and
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/// storage types.
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///
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template<typename Functor, typename TypeList, typename StorageList>
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VTKM_CONT_EXPORT
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void CastAndCall(const Functor &f, TypeList, StorageList) const;
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private:
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boost::shared_ptr<vtkm::cont::internal::SimplePolymorphicContainerBase>
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ArrayStorage;
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template<typename Type, typename Storage>
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VTKM_CONT_EXPORT
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vtkm::cont::internal::SimplePolymorphicContainer<
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vtkm::cont::ArrayHandle<Type,Storage> > *
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TryCastStorage() const {
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return
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dynamic_cast<
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vtkm::cont::internal::SimplePolymorphicContainer<
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vtkm::cont::ArrayHandle<Type,Storage> > *>(
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this->ArrayStorage.get());
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}
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};
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namespace detail {
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template<typename Functor, typename Type>
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struct DynamicArrayHandleTryStorage {
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const DynamicArrayHandle Array;
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const Functor &Function;
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bool FoundCast;
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VTKM_CONT_EXPORT
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DynamicArrayHandleTryStorage(const DynamicArrayHandle &array,
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const Functor &f)
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: Array(array), Function(f), FoundCast(false) { }
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template<typename Storage>
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VTKM_CONT_EXPORT
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typename boost::enable_if<
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typename vtkm::cont::internal::IsValidArrayHandle<Type,Storage>::type
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>::type
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operator()(Storage) {
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if (!this->FoundCast &&
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this->Array.IsTypeAndStorage(Type(), Storage()))
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{
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this->Function(this->Array.CastToArrayHandle(Type(), Storage()));
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this->FoundCast = true;
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}
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}
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template<typename Storage>
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VTKM_CONT_EXPORT
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typename boost::disable_if<
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typename vtkm::cont::internal::IsValidArrayHandle<Type,Storage>::type
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>::type
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operator()(Storage) {
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// This type of array handle cannot exist, so do nothing.
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}
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};
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template<typename Functor, typename StorageList>
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struct DynamicArrayHandleTryType {
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const DynamicArrayHandle Array;
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const Functor &Function;
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bool FoundCast;
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VTKM_CONT_EXPORT
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DynamicArrayHandleTryType(const DynamicArrayHandle &array, const Functor &f)
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: Array(array), Function(f), FoundCast(false) { }
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template<typename Type>
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VTKM_CONT_EXPORT
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void operator()(Type) {
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if (this->FoundCast) { return; }
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typedef DynamicArrayHandleTryStorage<Functor, Type> TryStorageType;
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TryStorageType tryStorage =
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TryStorageType(this->Array, this->Function);
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vtkm::ListForEach(tryStorage, StorageList());
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if (tryStorage.FoundCast)
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{
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this->FoundCast = true;
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}
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}
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};
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} // namespace detail
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template<typename Functor, typename TypeList, typename StorageList>
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VTKM_CONT_EXPORT
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void DynamicArrayHandle::CastAndCall(const Functor &f,
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TypeList,
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StorageList) const
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{
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VTKM_IS_LIST_TAG(TypeList);
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VTKM_IS_LIST_TAG(StorageList);
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typedef detail::DynamicArrayHandleTryType<Functor, StorageList> TryTypeType;
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TryTypeType tryType = TryTypeType(*this, f);
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vtkm::ListForEach(tryType, TypeList());
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if (!tryType.FoundCast)
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{
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throw vtkm::cont::ErrorControlBadValue(
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"Could not find appropriate cast for array in CastAndCall.");
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}
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}
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namespace internal {
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template<typename TypeList, typename StorageList>
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class DynamicArrayHandleCast : public vtkm::cont::DynamicArrayHandle
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{
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VTKM_IS_LIST_TAG(TypeList);
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VTKM_IS_LIST_TAG(StorageList);
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public:
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VTKM_CONT_EXPORT
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DynamicArrayHandleCast() : DynamicArrayHandle() { }
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VTKM_CONT_EXPORT
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DynamicArrayHandleCast(const vtkm::cont::DynamicArrayHandle &array)
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: DynamicArrayHandle(array) { }
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template<typename SrcTypeList, typename SrcStorageList>
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VTKM_CONT_EXPORT
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DynamicArrayHandleCast(
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const DynamicArrayHandleCast<SrcTypeList,SrcStorageList> &array)
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: DynamicArrayHandle(array) { }
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template<typename NewTypeList>
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VTKM_CONT_EXPORT
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DynamicArrayHandleCast<NewTypeList,StorageList>
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ResetTypeList(NewTypeList = NewTypeList()) const {
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VTKM_IS_LIST_TAG(NewTypeList);
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return DynamicArrayHandleCast<NewTypeList,StorageList>(*this);
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}
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template<typename NewStorageList>
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VTKM_CONT_EXPORT
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internal::DynamicArrayHandleCast<TypeList,NewStorageList>
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ResetStorageList(NewStorageList = NewStorageList()) const {
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VTKM_IS_LIST_TAG(NewStorageList);
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return internal::DynamicArrayHandleCast<TypeList,NewStorageList>(*this);
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}
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template<typename Functor>
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VTKM_CONT_EXPORT
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void CastAndCall(const Functor &f) const
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{
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this->CastAndCall(f, TypeList(), StorageList());
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}
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template<typename Functor, typename TL, typename CL>
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VTKM_CONT_EXPORT
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void CastAndCall(const Functor &f, TL, CL) const
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{
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this->DynamicArrayHandle::CastAndCall(f, TL(), CL());
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}
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};
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template<>
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struct DynamicTransformTraits<vtkm::cont::DynamicArrayHandle> {
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typedef vtkm::cont::internal::DynamicTransformTagCastAndCall DynamicTag;
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};
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template<typename TypeList, typename StorageList>
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struct DynamicTransformTraits<
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vtkm::cont::internal::DynamicArrayHandleCast<TypeList,StorageList> >
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{
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typedef vtkm::cont::internal::DynamicTransformTagCastAndCall DynamicTag;
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};
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} // namespace internal
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}
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} // namespace vtkm::cont
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#endif //vtk_m_cont_DynamicArrayHandle_h
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