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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
* @class vtkDGArrayOutputAccessor
* @brief Store values interpolated from DG cells into a vtkDoubleArray instance.
*/
#ifndef vtkDGArrayOutputAccessor_h
#define vtkDGArrayOutputAccessor_h
#include "vtkDoubleArray.h" // For API.
#include "vtkFiltersCellGridModule.h" // For export macro.
#include "vtkVector.h" // For API.
#include <cassert>
VTK_ABI_NAMESPACE_BEGIN
class VTKFILTERSCELLGRID_EXPORT vtkDGArrayOutputAccessor
{
public:
vtkDGArrayOutputAccessor(vtkDoubleArray* result);
vtkDGArrayOutputAccessor(const vtkDGArrayOutputAccessor& other);
~vtkDGArrayOutputAccessor();
vtkDGArrayOutputAccessor& operator=(const vtkDGArrayOutputAccessor& other);
/// Expose a tuple in a vtkDoubleArray as an object with a size() method
/// to satisfy requirements of the output iterator API.
struct Tuple
{
Tuple() = default;
Tuple(double* data, int size)
: Data(data)
, Size(size)
{
}
Tuple(const Tuple&) = default;
Tuple& operator=(const Tuple&) = default;
double& operator[](int ii)
{
assert(ii < this->Size);
return this->Data[ii];
}
const double* data() const { return this->Data; }
double* data() { return this->Data; }
int size() const { return this->Size; }
/// If a tuple is "null", make it "falsy"; otherwise it is "truthy."
operator bool() const { return !!this->Data && this->Size > 0; }
double* Data{ nullptr };
int Size{ 0 };
};
Tuple operator[](vtkTypeUInt64 tupleId);
vtkTypeUInt64 GetKey() const { return this->Key; }
Tuple GetTuple();
void Restart();
bool IsAtEnd() const;
std::size_t size() const;
vtkTypeUInt64 operator++();
vtkTypeUInt64 operator++(int);
vtkDGArrayOutputAccessor& operator+=(vtkTypeUInt64 count);
protected:
vtkTypeUInt64 Key{ 0 };
vtkDoubleArray* Result{ nullptr };
};
VTK_ABI_NAMESPACE_END
#endif // vtkDGArrayOutputAccessor_h
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