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