vtkConstantImplicitBackend.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
// Funded by CEA, DAM, DIF, F-91297 Arpajon, France
#ifndef vtkConstantImplicitBackend_h
#define vtkConstantImplicitBackend_h
 
#include "vtkCommonCoreModule.h"
#include "vtkCompiler.h" // For VTK_USE_EXTERN_TEMPLATE
#include "vtkSetGet.h"   // for vtkNotUsed
#include "vtkType.h"     // For vtkExternTemplateMacro
 
VTK_ABI_NAMESPACE_BEGIN
template <typename ValueType>
struct VTKCOMMONCORE_EXPORT vtkConstantImplicitBackend final
{
  vtkConstantImplicitBackend(ValueType val)
    : Value(val)
  {
  }
 
  ValueType operator()(vtkIdType vtkNotUsed(index)) const { return this->Value; }
 
  const ValueType Value;
};
VTK_ABI_NAMESPACE_END
 
#endif // vtkConstantImplicitBackend_h
 
#if defined(VTK_CONSTANT_BACKEND_INSTANTIATING)
 
#define VTK_INSTANTIATE_CONSTANT_BACKEND(ValueType)                                                \
  VTK_ABI_NAMESPACE_BEGIN                                                                          \
  template struct VTKCOMMONCORE_EXPORT vtkConstantImplicitBackend<ValueType>;                      \
  VTK_ABI_NAMESPACE_END
 
#elif defined(VTK_USE_EXTERN_TEMPLATE)
 
#ifndef VTK_CONSTANT_BACKEND_TEMPLATE_EXTERN
#define VTK_CONSTANT_BACKEND_TEMPLATE_EXTERN
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable : 4910) // extern and dllexport incompatible
#endif
VTK_ABI_NAMESPACE_BEGIN
vtkExternTemplateMacro(extern template struct VTKCOMMONCORE_EXPORT vtkConstantImplicitBackend);
VTK_ABI_NAMESPACE_END
#ifdef _MSC_VER
#pragma warning(pop)
#endif
#endif // VTK_CONSTANT_IMPLICIT_BACKEND_TEMPLATE_EXTERN
 
#endif