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120 lines
5.6 KiB
120 lines
5.6 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkTemplateAliasMacro.h,v $
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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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// .NAME vtkTemplateAliasMacro - Dispatch a scalar processing template.
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// .SECTION Description
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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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#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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// Force UINT64 off if we cannot implement support for it.
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#if defined(VTK_TYPE_USE___INT64) && !defined(VTK_TYPE_CONVERT_UI64_TO_DOUBLE)
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# undef VTK_USE_UINT64
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# define VTK_USE_UINT64 0
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#endif
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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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}; 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; call; \
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}; break
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// Add "long long" to the template macro if it is enabled.
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#if defined(VTK_TYPE_USE_LONG_LONG)
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# define vtkTemplateAliasMacroCase_ll(typeN, call) \
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vtkTemplateAliasMacroCase(typeN, call);
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#else
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# define vtkTemplateAliasMacroCase_ll(typeN, call)
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#endif
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// Add "__int64" to the template macro if it is enabled.
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#if defined(VTK_TYPE_USE___INT64)
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# define vtkTemplateAliasMacroCase_i64(typeN, call) \
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vtkTemplateAliasMacroCase(typeN, call);
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#else
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# define vtkTemplateAliasMacroCase_i64(typeN, call)
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#endif
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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_ll(LONG_LONG, call) \
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vtkTemplateAliasMacroCase_ll(UNSIGNED_LONG_LONG, call) \
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vtkTemplateAliasMacroCase_i64(__INT64, call) \
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vtkTemplateAliasMacroCase_i64(UNSIGNED___INT64, 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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