vtkDataArrayRange.h

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/*=========================================================================
 
  Program:   Visualization Toolkit
  Module:    vtkDataArrayRange.h
 
  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
 
     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.
 
=========================================================================*/
 
#ifndef vtkDataArrayRange_h
#define vtkDataArrayRange_h
 
#include "vtkAOSDataArrayTemplate.h"
#include "vtkDataArray.h"
#include "vtkDataArrayMeta.h"
#include "vtkDataArrayTupleRange_AOS.h"
#include "vtkDataArrayTupleRange_Generic.h"
#include "vtkDataArrayValueRange_AOS.h"
#include "vtkDataArrayValueRange_Generic.h"
#include "vtkMeta.h"
#include "vtkSmartPointer.h"
 
#include <cassert>
#include <iterator>
#include <type_traits>
 
VTK_ITER_OPTIMIZE_START
 
namespace vtk
{
 
namespace detail
{
 
// Internal detail: This utility is not directly needed by users of
// DataArrayRange.
//
// These classes are used to detect when specializations exist for a given
// array type. They are necessary because given:
//
// template <typename ArrayType> class SomeTemplateClass;
// template <typename T> class SomeTemplateClass<vtkAOSDataArrayTemplate<T>>;
//
// SomeTemplateClass<vtkFloatArray> will pick the generic version, as ArrayType
// is a better match than vtkAOSDataArrayTemplate<T>. This class works around
// that by using Declare[Tuple|Value]RangeSpecialization functions that map an
// input ArrayTypePtr and tuple size to a specific version of the appropriate
// Range.
template <typename ArrayTypePtr, ComponentIdType TupleSize>
struct SelectTupleRange
{
private:
  // Allow this to work with vtkNew, vtkSmartPointer, etc.
  using ArrayType = typename detail::StripPointers<ArrayTypePtr>::type;
 
  static_assert(detail::IsValidTupleSize<TupleSize>::value, "Invalid tuple size.");
  static_assert(detail::IsVtkDataArray<ArrayType>::value, "Invalid array type.");
 
public:
  using type =
    typename std::decay<decltype(vtk::detail::DeclareTupleRangeSpecialization<ArrayType, TupleSize>(
      std::declval<ArrayType*>()))>::type;
};
 
template <typename ArrayTypePtr, ComponentIdType TupleSize>
struct SelectValueRange
{
private:
  // Allow this to work with vtkNew, vtkSmartPointer, etc.
  using ArrayType = typename detail::StripPointers<ArrayTypePtr>::type;
 
  static_assert(detail::IsValidTupleSize<TupleSize>::value, "Invalid tuple size.");
  static_assert(detail::IsVtkDataArray<ArrayType>::value, "Invalid array type.");
 
public:
  using type =
    typename std::remove_reference<decltype(vtk::detail::DeclareValueRangeSpecialization<ArrayType,
      TupleSize>(std::declval<ArrayType*>()))>::type;
};
 
} // end namespace detail
 
template <ComponentIdType TupleSize = detail::DynamicTupleSize,
  typename ArrayTypePtr = vtkDataArray*>
VTK_ITER_INLINE auto DataArrayTupleRange(const ArrayTypePtr& array, TupleIdType start = -1,
  TupleIdType end = -1) -> typename detail::SelectTupleRange<ArrayTypePtr, TupleSize>::type
{
  // Lookup specializations:
  using RangeType = typename detail::SelectTupleRange<ArrayTypePtr, TupleSize>::type;
 
  assert(array);
 
  return RangeType(array, start < 0 ? 0 : start, end < 0 ? array->GetNumberOfTuples() : end);
}
 
template <ComponentIdType TupleSize = detail::DynamicTupleSize,
  typename ArrayTypePtr = vtkDataArray*>
VTK_ITER_INLINE auto DataArrayValueRange(const ArrayTypePtr& array, ValueIdType start = -1,
  ValueIdType end = -1) -> typename detail::SelectValueRange<ArrayTypePtr, TupleSize>::type
{
  using RangeType = typename detail::SelectValueRange<ArrayTypePtr, TupleSize>::type;
 
  assert(array);
 
  return RangeType(array, start < 0 ? 0 : start, end < 0 ? array->GetNumberOfValues() : end);
}
 
} // end namespace vtk
 
VTK_ITER_OPTIMIZE_END
 
#endif // vtkDataArrayRange_h
 
// VTK-HeaderTest-Exclude: vtkDataArrayRange.h