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/*=========================================================================
Program: Visualization Toolkit
Module: vtkTemplateAliasMacro.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.
=========================================================================*/
/**
* @class vtkTemplateAliasMacro
* @brief Dispatch a scalar processing template.
*
* vtkTemplateAliasMacro is used in a switch statement to
* automatically generate duplicate code for all enabled scalar types.
* The code can be written to use VTK_TT to refer to the type, and
* each case generated will define VTK_TT appropriately. The
* difference between this and the standard vtkTemplateMacro is that
* this version will set VTK_TT to an "alias" for each type. The
* alias may be the same type or may be a different type that is the
* same size/signedness. This is sufficient when only the numerical
* value associated with instances of the type is needed, and it
* avoids unnecessary template instantiations.
*
* Example usage:
*
* void* p = dataArray->GetVoidPointer(0);
* switch(dataArray->GetDataType())
* {
* vtkTemplateAliasMacro(vtkMyTemplateFunction(static_cast<VTK_TT*>(p)));
* }
*/
#ifndef vtkTemplateAliasMacro_h
#define vtkTemplateAliasMacro_h
#include "vtkTypeTraits.h"
// Allow individual switching of support for each scalar size/signedness.
// These could be made advanced user options to be configured by CMake.
#define VTK_USE_INT8 1
#define VTK_USE_UINT8 1
#define VTK_USE_INT16 1
#define VTK_USE_UINT16 1
#define VTK_USE_INT32 1
#define VTK_USE_UINT32 1
#define VTK_USE_INT64 1
#define VTK_USE_UINT64 1
#define VTK_USE_FLOAT32 1
#define VTK_USE_FLOAT64 1
//--------------------------------------------------------------------------
// Define helper macros to switch types on and off.
#define vtkTemplateAliasMacroCase(typeN, call) \
vtkTemplateAliasMacroCase0(typeN, call, VTK_TYPE_SIZED_##typeN)
#define vtkTemplateAliasMacroCase0(typeN, call, sized) \
vtkTemplateAliasMacroCase1(typeN, call, sized)
#define vtkTemplateAliasMacroCase1(typeN, call, sized) \
vtkTemplateAliasMacroCase2(typeN, call, VTK_USE_##sized)
#define vtkTemplateAliasMacroCase2(typeN, call, value) \
vtkTemplateAliasMacroCase3(typeN, call, value)
#define vtkTemplateAliasMacroCase3(typeN, call, value) \
vtkTemplateAliasMacroCase_##value(typeN, call)
#define vtkTemplateAliasMacroCase_0(typeN, call) \
case VTK_##typeN: \
{ \
vtkGenericWarningMacro("Support for VTK_" #typeN " not compiled."); \
}; \
break
#define vtkTemplateAliasMacroCase_1(typeN, call) \
case VTK_##typeN: \
{ \
typedef vtkTypeTraits<VTK_TYPE_NAME_##typeN>::SizedType VTK_TT; \
call; \
}; \
break
// Define a macro to dispatch calls to a template instantiated over
// the aliased scalar types.
#define vtkTemplateAliasMacro(call) \
vtkTemplateAliasMacroCase(DOUBLE, call); \
vtkTemplateAliasMacroCase(FLOAT, call); \
vtkTemplateAliasMacroCase(LONG_LONG, call); \
vtkTemplateAliasMacroCase(UNSIGNED_LONG_LONG, call); \
vtkTemplateAliasMacroCase(ID_TYPE, call); \
vtkTemplateAliasMacroCase(LONG, call); \
vtkTemplateAliasMacroCase(UNSIGNED_LONG, call); \
vtkTemplateAliasMacroCase(INT, call); \
vtkTemplateAliasMacroCase(UNSIGNED_INT, call); \
vtkTemplateAliasMacroCase(SHORT, call); \
vtkTemplateAliasMacroCase(UNSIGNED_SHORT, call); \
vtkTemplateAliasMacroCase(CHAR, call); \
vtkTemplateAliasMacroCase(SIGNED_CHAR, call); \
vtkTemplateAliasMacroCase(UNSIGNED_CHAR, call)
#endif
// VTK-HeaderTest-Exclude: vtkTemplateAliasMacro.h
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